SUN and Microsoft NT 4.0 DHCP Server

Hi all,
I have some old type Wyse Thin Client Terminal (Thin client type WinTerm 2300SE) and I am doing a migration from old network to the new network. On the old network, we are using a Microsoft NT4 DHCP Server and on the new network, we are using a SUN DHCP Server and it's running Solaris 5.8.
The problem is all old type Wyse Thin Client Terminal couldn't obtain the IP address from SUN DHCP Server but it has no problem with Microsoft NT4 DHCP Server. This problem happens only on old type Wyse Terminal but the rest of the clients are perfectly obtaining the IP address from both Server.
When I did a sniffer trace, the SUN DHCP Server offerred an IP address to the this client but after this client accepted the offer and inform back to SUN Server, the SUN Server never acknowledged this request. So the Wyse client never get the IP address.
Thanks.
E1

Can you send me a full configuration of your SUN DHCP server
i had the same problem and now all is ok
i will compare your config to mine

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1941w - Need help with IP address assigning, and relay wireless to a DHCP server.

Hope someone can point me in the right direction -
Basically have a Win08 R2 DHCP server, and a 1941w router.
I've got the internet, got the lan clients getting DHCP ok (with ip helper-address set on the 0/0 internal interface).
Also have the SSID, and wireless clients can connect - but no IPs are being handed out, also not sure if I understand or did the bridging correctly or assigned IPs to the vlan or bvi1 correctly.
for ex:
DHCP server IP:
10.10.2.4
Router Ethernet internal interface 0/0 IP:
10.10.2.1
with helper-address 10.10.2.4 (lan clients are resolving IPs correctly from the DHCP server)
Vlan1 IP address:
10.10.3.1
Does this interface need the helper-address as well? (10.10.2.4)?
wlan-ap 0 IP address:
unnumbered
interface BVI1 IP address (static):
10.10.2.2
am i totally off? not even sure if i have the vlan bridged to the 0/0 adapter or not correctly - but as I said, i can get a wireless client to connect with the SSID.
would appreciate any advice/pointers, thanks

of course - here is the router config:
=======================================================
Using 5591 out of 262136 bytes
version 15.1
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers
hostname router
boot-start-marker
boot-end-marker
security authentication failure rate 3 log
security passwords min-length 6
logging buffered 51200
logging console critical
enable secret 5 $1$JWwK$.04.NFg7tQ82UTy68/hyv.
no aaa new-model
service-module wlan-ap 0 bootimage autonomous
no ipv6 cef
no ip source-route
ip cef
no ip bootp server
ip name-server 10.10.2.4
multilink bundle-name authenticated
crypto pki token default removal timeout 0
crypto pki trustpoint TP-self-signed-975501586
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-975501586
revocation-check none
rsakeypair TP-self-signed-975501586
crypto pki certificate chain TP-self-signed-975501586
certificate self-signed 01 nvram:IOS-Self-Sig#3.cer
license udi pid CISCO1941W-A/K9 sn FTX155085QG
hw-module ism 0
ip tcp synwait-time 10
ip ssh time-out 60
ip ssh authentication-retries 2
interface Embedded-Service-Engine0/0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
shutdown
interface GigabitEthernet0/0
description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-GE 0/0$$ES_LAN$$FW_INSIDE$
ip address 10.10.2.1 255.255.255.0
ip helper-address 10.10.2.4
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip nat inside
ip virtual-reassembly in
duplex auto
speed auto
no mop enabled
interface wlan-ap0
description Service module interface to manage the embedded AP
ip unnumbered GigabitEthernet0/0
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
arp timeout 0
no mop enabled
no mop sysid
interface GigabitEthernet0/1
description $ES_WAN$$FW_OUTSIDE$
ip address dhcp client-id GigabitEthernet0/1
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
no mop enabled
interface Wlan-GigabitEthernet0/0
description Internal switch interface connecting to the embedded AP
no ip address
interface Vlan1
ip address 10.10.3.1 255.255.255.0
ip helper-address 10.10.2.4
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip forward-protocol nd
ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
ip nat inside source list 1 interface GigabitEthernet0/1 overload
logging trap debugging
access-list 1 remark INSIDE_IF=GigabitEthernet0/0
access-list 1 remark CCP_ACL Category=2
access-list 1 permit 10.10.2.0 0.0.0.255
no cdp run
control-plane
line con 0
login local
transport output telnet
line aux 0
login local
transport output telnet
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line 67
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
line vty 0 4
privilege level 15
login local
transport input telnet ssh
line vty 5 15
privilege level 15
login local
transport input telnet ssh
scheduler allocate 20000 1000
end
=======================================================
and the ap config:
=======================================================
Using 2067 out of 32768 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
hostname ap
enable secret 5 $1$xKDT$GdLGeA6h.H9LKL9l3dPmj.
no aaa new-model
dot11 syslog
dot11 ssid WIFI1
   vlan 1
   authentication open
   authentication key-management wpa
   mbssid guest-mode
   wpa-psk ascii 7 044B1E030D2D43632A
bridge irb
interface Dot11Radio0
no ip address
no ip route-cache
encryption vlan 1 mode ciphers aes-ccm
broadcast-key vlan 1 change 30
ssid WIFI1
antenna gain 0
station-role root
interface Dot11Radio0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 2
bridge-group 2 subscriber-loop-control
bridge-group 2 block-unknown-source
no bridge-group 2 source-learning
no bridge-group 2 unicast-flooding
bridge-group 2 spanning-disabled
interface Dot11Radio1
no ip address
no ip route-cache
encryption vlan 1 mode ciphers aes-ccm
broadcast-key vlan 1 change 30
ssid WIFI1
antenna gain 0
dfs band 3 block
channel dfs
station-role root
interface Dot11Radio1.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 2
bridge-group 2 subscriber-loop-control
bridge-group 2 block-unknown-source
no bridge-group 2 source-learning
no bridge-group 2 unicast-flooding
bridge-group 2 spanning-disabled
interface GigabitEthernet0
description the embedded AP GigabitEthernet 0 is an internal interface connecting AP with the host router
no ip address
no ip route-cache
interface GigabitEthernet0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
interface BVI1
ip address 10.10.2.2 255.255.255.0
no ip route-cache
ip http server
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
bridge 1 route ip
line con 0
no activation-character
line vty 0 4
login local
end
============================================

Blank size between Sun and Microsoft

i use JTextPane to input and display data in gui,after save its data into database,i will output data into rtf file which will be opened by word. my problem is: i found Java's blank size is not equal to Microsoft's blank size,so cause the data which aligned as i request in JTextPane cannot align in word file. anyone can help guide what's difference between Java's blank size and Microsoft's blank size, what's their scale?
Thanks for any information.
Susan

Use a monospaced font and you shouldn't have a problem.

Windows DHCP Server and Linux DHCP Relay Agent

We are trying to organize a VLAN (say VLAN 1) for guests who must be assigned IP addresses from a DHCP server in a different VLAN (VLAN 2). This DHCP server is configured with two scopes - 172.16.0.0/24 (for VLAN 2) and 172.16.4.0/24 (for the Guests
VLAN 1). The DHCP server successfully distributes addresses to clients in its VLAN (it has the IP address 172.16.0.2). For the clients in the other VLAN a DHCP Relay Agent has been setup on the router. It is DHCRELAY running on Linux (CentOS) which has
been configured to accept the DHCPDISCOVER broadcasts coming on the VLAN1 interface of the router and forward these to the DHCP server. The IP address of the VLAN1 interface of the router is 172.16.4.254 and on the VLAN2 interface - 172.16.0.254
The problem is that the DHCP server won't respond with a DHCPOFFER message to the relay agent. I have traced the frames on the router and on the DHCP server. They arrive on the DHCP server with the correct GIADDR of the relay agent. According to all documentation,
if a scope has been configured on the DHCP server and it receives a unicast message with the GIADDR set by a relay agent that matches one of the configured scopes, the DHCP server must send a unicast DHCPOFFER to the relay agent. But it doesn't.
Here is what Wireshark reports (ignore the Destination port unreachable messages, the DHCP service was stopped at the time Wireshark was running)
When the service is running, there are just DHCPDISCOVERs - no OFFER. You can see that the server has the two scopes configured:
The relay agent seems to work normally - it forwards the DHCPDISCOVERs to the server continuously (tried many times with ipconfig /renew on the client).
I read many posts about this problem. Some users had other services running on the DHCP server that used the DHCP port, but I don't have such an issue (you see that when the service is stopped, an ICMP port unreachable is sent which is correct). Others however
did not find a solution. Am I missing something? Is there something specific when using the DHCRELAY agent from DHCPD? Can I turn on some verbose logging to track this down? Thanks in advance.

WIth DHCP, there is really nothing to configure. If the Relay Agent/IP Helper is pointing to it, and the VLAN subnet exactly matches the scope subnet, then it should just work.
What I've seen in the VLAN config is either a static route back to the subnet the DHCP server itself is sitting on is not configured or incorrectly configured, or there are ports blocked (need UDP, too, since that's what DHCP uses to pass the OFFER), and
other necessary ports are opened, then it should just work.
Sometimes NIC teaming on the DHCP server will cause it. Not sure. Microsoft doesn't support teaming prior to Windwos 2012, but it doesn't mean that it doesn't work. Don't get me wrong, teaming works nicely, but they just don't support it because they never
certified the drivers, that's all.
The issues I've seen with DHCP relays and VLANs in the forums are usually based on misconfigs in the VLAN or ports blocked. Sometimes we'll refer to call Microsoft Support for specific, hands-on assistance. And searching the threads, from what
I've found that if they did call support, they've never posted back what the problem was based on or the resolution. I can post a couple of them for you to read through, but there were never any response with the actual resolution.
If you like, you also have the option to contact Microsoft Support. Here's a list of phone numbers if you choose this option:
http://support.microsoft.com/contactus/
Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/
This post is provided AS-IS with no warranties or guarantees and confers no rights.

Unable to contact DHCP server. Lenovo 3000 K100 w/Gigabit LAN and Windows Vista

I tried ipconfig release/renew command and got "Unable to contact DHCP server." message.
Any help is greatly appreciated.
S
Message Edited by seniaFarber on 05-30-2008 03:51 AM

Hi Destrijderen5,
Have you tried reinstalling and then uninstalling ZoneAlarm?
Maliha (I don't work for lenovo)
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Clients Not seeing DHCP server at branch office or not accepting ip offers (NO LOG REPORTS KIND OF IN THE DARK)

Hi there i am having an issue that has popped up recently i have a DC at a branch office that is connected to the main office DC via a Persistent Demand Dial connection in RRAS. Everything was working properly according to me until i found out that the Network
Admin who manages the branch office network failed to notify me that client machines weren't getting IP addresses from the DHCP server. This server was recently installed and wasn't fully implemented till about a week ago when i configured the Demand Dial
connection in RRAS up until that point it just had a regular old VPN connection to the main office while we worked out the kinks with a few things. the things ive tried so far to get DHCP working are as followed
1.Rebooted the branch office server (MULTIPLE TIMES)
2. Uninstalled the DHCP Role and re-installed it....To my surprise 1 client managed to get a ip on its lan adapter after DHCP was re-installed but nothing else
3. Disconnected the connection between the main office DC and the Branch office DC as i figured the main office DC DHCP server might be interfering with the branch office DC DHCP Server but nothing happened
4. Unauthorized and Reauthorized the main office DHCP server and the branch office DHCP server nothing changed
5. sifted through multiple log files on both servers and found noting in fact DHCP logs are empty on both servers
6. restored backups of the DHCP servers from when they were working
7. came here cause im out of ideas and im pulling my hair out
here are the current statistics from the problem server
Start Time: 7/12/2014 2:02:10PM
Up Time: 1Hours, 18 Minutes, 41 Seconds
Discovers: 90
Offers: 90
Requests: 2
Acks: 13
Nacks: 0
Declines: 0
Releases: 0
Total Scopes: 1
Total Addresses 253
In Use 2 (0%)
Available: 251 (99%)
Id like to add that RRAS was getting IP addresses from the problem server up until the point i uninstalled the role and re-installed it
heres is a ipconfig /all from the problem server
Windows IP Configuration
Host Name . . . . . . . . . . . . : MNB-DC
Primary Dns Suffix . . . . . . . : VTEACR.LOCAL
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : VTEACR.LOCAL
PPP adapter Remote Router:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Remote Router
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.141.70.25(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 10.141.70.10
NetBIOS over Tcpip. . . . . . . . : Disabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
Physical Address. . . . . . . . . : 00-16-35-AB-D3-05
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d9e:daa4:34dd:db44%10(Preferred)
IPv4 Address. . . . . . . . . . . : 10.141.80.102(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : fe80::226:5aff:feb7:5b3c%10
10.141.80.1
DNS Servers . . . . . . . . . . . : ::1
10.141.80.102
NetBIOS over Tcpip. . . . . . . . : Enabled
PPP adapter RAS (Dial In) Interface:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : RAS (Dial In) Interface
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 169.254.238.243(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Local Area Connection* 8:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{427DF66B-3B30-40B1-B67E-B5587465C
394}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 9:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.ziricom.com
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 12:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.VTEACR.LOCAL
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 13:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{BE201060-A9B9-404A-8361-F8FFB82F5
6F6}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 14:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 15:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.VTEACR.LOCAL
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 16:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #7
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 19:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.ziricom.com
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
if anymore information is needed please let me know i have full access to everything on the network so its not a problem and i am able to remotely access the branch office DC and all computer and switches at any time of the day
Viper Technologies Computer Repair Putting The Venomus Bite Back In Your Computer We Are Located In Antigonish ,NS Canada Check Us Out HTTP://WWW.VIPERTECHNOLOGIES.TK

Hi,
Does this issue occur on one client or multiple?
Please check this article:
http://technet.microsoft.com/en-us/library/cc757164(v=ws.10).aspx#BKMK_5
Regards.
Vivian Wang

IP address storing as reverse hexa format in dhcp server

Hi ,
am looking wired and strange state in my dhcp server(win 2008)
Added my esx machine mac address in dhcp(ex: ip address w.x.y.z) server after few days my esx host ip address changed to 0.0.0.0 .and in dhcp server at(w.x.y.z)
address leases it replaced with reverse hexa format of ipaddress.
I found the workaround for this issue i.e OS reinstall. but after few days again am hitting same issue.
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Thanks.
I'm not sure how the ESX host is setup or configured, but I would have assumed if it's a Windows machine, it would automatically register the proper IP and name in DNS. If it's a native ESX, I would probably look at the host's network config.
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.

DHCP server + IP multipath

hi,
I have configured a solaris 10 box that runs a dhcp server with ha networking using multipathing:
ifconfig dmfe0 thehostname netmask + broadcast + group mygroup -failover deprecated up
ifconfig dmfe0 addif hahostname + broadcast + failover up
ifconfig dmfe1 otherhostname netmask + broadcast + group mygroup -failover deprecated up
The networking if working fine, and setting the failover period to 2500 in /etc/default/mpathd works great - unplug cable from dmfe0 and the host is still available
before using hahostname as a virtual interface, it was bound to dmfe0, and running dhcp was all fine. Now that the IP is on the virtual interface, the DHCP server address that clients see is the IP of "thehostname" (from /etc/hosts). 1st question: is it possible to get the DHCP server to show its IP address as the IP of HAHOSTNAME instead of THEHOSTNAME? I have added "INTERFACES=dmfe0,dmfe1" to /etc/inet/dhcpsrv.conf, not able to bind to virtual interfaces, would like to if possible
In addition to that, since implementing this networking config, dhcp is not running as well. The clients on the network all received dhcp addresses with no problems prior to the HA configuration changes, after changing to this config and restarting (either restarting the dhcp-server service with svcadm or even after a server reboot), some clients are not getting IP addresses. The clients are Windows XP clients, and I had to disable my network card and re-enable it to get it to get an IP address. I get the following error in event viewer (event ID 1001):
"The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server."
after getting an IP, i can renew my IP and there are no problems, but in the event of the primary nic failing (tested by unplugging network cable), i cannot get DHCP addresses again.
the first thing that jumps to mind is it might be an arp issue - should i be binding the same mac address to all cards perhaps? i have set local-mac-address?=true with eeprom.
ideas?

You may want to ask this under Firewall section of this forum.
Regards,
Sawan Gupta

There is any conflict betwenn CS and Microsoft productions like Sharepoint

Hi all
I install infra on win2003 server and some of the Microsoft productions like Sharepoint, Exchange Server,Visual Studio .Net2003, Sql Server,
Microsoft Development Network, Microsoft .Net and Frame work SDK ver 1.1 before infra, installed on this server. duration installation i receive multiple errors .i remove all Microsoft productions and install new and clean Win2003 server and install again infra but this time i don't receive any error.after infra installation i install the Microsoft productions and this time some error on Sql Server appears.
i install infra and storage in different scenario:
install infra on clean and new installed win2003 server without any error and install storage on second win2003 server that the Microsoft productions installed on it before. in this time i receive error "Open Wallet Failure".
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I install infra on win2003 server and some of the Microsoft productions like Sharepoint, Exchange Server,Visual Studio .Net2003, Sql Server,
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install infra on clean and new installed win2003 server without any error and install storage on second win2003 server that the Microsoft productions installed on it before. in this time i receive error "Open Wallet Failure".
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thanks in advance.

Can't get DHCP server to give out correct subnet IP's.

Hi all,
I recently added a VLAN to my SG500X switch. I have the devices communicating between the VLAN’s (using static IP’s).
I setup the new DHCP subnet on my Windows 2003 server but I can’t seem to get the DHCP server to hand out IP’s from the new subnet.
From what I understand, the Windows DHCP server is supposed to detect which VLAN the request is coming from and hand out the correct one. If I plug a laptop into one of the untagged switch ports for the new VLAN I get an IP address...but it's from the original/primary subnet.
Do I need to configure anything else on the switch? It seems to be handing out IP’s on the primary subnet/VLAN just fine. I just need it to hand the correct one.
Any suggestions are appreciated.
Thanks,
Dan

Everyone has provided you good info on what to look into so I will just try to give you some background info as this topic threw me for a loop back in the day when I was studying for my CCNA. It never was really explained how the dhcp server knew which scope to assign from. It works like this assuming the dhcp server is not inside the broadcast domain of the client.
1.Client with sends a DHCP request broadcast message
2.Access switch receives untagged frame from client with destination mac of FF:FF:FF:FF:FF:FF
3.Access switch encapsulates the packet into a frame that includes the vlan ID that was configured on the access port the client was connected to. Lets say vlan 10
4.Frame is forwarded out all interfaces in the same vlan or trunk interfaces except where it was received from
5.Your router receives the frame from the trunk port. You either have an SVI or subinterface configured on the L3switch/router that is listening for traffic from that vlan. That SVI/subinterface will have an IP address on it. lets say 10.0.0.1/24.
SVI
int vlan 10
ip address 10.0.0.1 255.255.255.0
ip helper-address 192.168.1.50
Router
int f0/0.10
encapsulation dot1q 10
ip address 10.0.0.1 255.255.255.0
ip helper-address 192.168.1.50
6.Here is were the ip helper comes into play. The router inserts the source IP of the SVI/subinterface for that vlan into the packet and sends it to the dhcp server. So 10.0.0.1 ->192.168.1.50
7.DHCP server receives and chooses the scope based on the source IP in the packet. so in my example the dhcp server will look through it's configured scope and would find one for the 10.0.0.0/24 network.
8. DHCP server sends the dhcp offer to the IP of the SVI/subinterface which then forwards it on to the client.

SF300-48P gets error message trying to enable DHCP server in unit

We have a SF300-48P that has been used as a dumb switch. The network is currently a peer-to-peer with all 30 devices (mixed desktop computers and some printers) having a fixed IP assigned or selected in them. While trying to add a NAS device the device reported it needed a DHCP connection. So, checking, I found that the latest firmware for the SF300 has a DHCP server inside it. (At least that's what I get out of the "features" commnets.) I downloaded the firmware from Cisco and upgraded the firmware to ver. 1.3.0.62. I changed the password as required and then went to the "IP configuration". I tried to check the box for "enable DHCP server" but got an error message something like "must unplug all DHCP devices". So I unplugged everthing from the switch except one computer with the IP fixed as 192.168.1.149 and tried to enable the DHCP server again. But, I got the same error.
Does the SF300 have a DHCP server internally with the ver 1.3.0.62 firmware? (or, did I misread the meaning?)
If the SF300 can be used as a DHCP server how do I go about enabling it?
( I am a complete n00b when it comes to networking so I will require some step-by-step guidance.)

Hi Terry, the switch must be operating in layer 3 mode. Additionally, any vlan interface created must have a static IP address. The error you received is most likely because the default vlan or any other vlan does not have a static IP (assuming you're in layer 3 already)
-Tom
Please mark answered for helpful posts

Ap not getting IP forn dhcp server

I have a 2504 WLC and 1042 ap's. Everything worked great in my test enviroment (of course). Now when I want to deploy the wireless, the ap's are not getting and ip for the windows dhcp server.
I have option 43 configured in dhcp, sub option 241>ip address of the controller
I have my A record in dns, cisco-capwap-controller.
*Mar 1 00:03:17.050: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
Not in Bound state.
*Mar 1 00:03:27.050: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
*Mar 1 00:03:27.054: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
*Mar 1 00:03:37.054: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
*Mar 1 00:03:47.054: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
*Mar 1 00:03:57.054: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
*Mar 1 00:04:07.054: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
Not in Bound state.
TIA,
Eric

Hello Eric,
As per your query i can suggest you the following solution-
You need to connect the AP with the switch for power. The dhcp proxy is really not needed. Another thing you can do is unplug the WLC from your switch, then make sure your APs are clean (wiped) then plug the APs into the switch and console into one of them and watch the boot up process to make sure that they are at least requesting an IP address. If they can request an IP successfully then your dhcp problem has something to do with how you have your WLC set up.
Hope this will help you.

How to connect Java and Microsoft SQL Server 2000

hi,
could anyone please teach me how to connect Java and SQL Sever 2000?? if possible could you guys provide me with an example??? i could hardly find any relevant resources about it...
Thanks ~!

thanks for the information...
by the way hv any working module on it?? i'm new to
both Java and Microsoft SQL Server... Thanks againFirst things first... you should read this:
http://java.sun.com/docs/books/tutorial/jdbc/
This is microsofts official JDBC Driver: http://www.microsoft.com/sql/downloads/jdbcregister.asp
Install it and the documentation has some usage examples

SAP NetWeaver 04s SP7 installation and DHCP server

Hi All,
I am installing SAP NetWeaver on a machine which I use at work. I am little scared whether this installation might harm my computer or the local corporate network. This machine is connected to the local network (uses DHCP) to get the IP address.
Are there any precautions which I need to take before I start practicing on this platform ?
I read this below point in the installation instructions...
=========================================================
If no DHCP server is available on your network (which dynamically determines the IP address) or your computer is not connected to any network, you need to install the virtual interface adapter MS Loopback Adapter. This is described in detail within the contents of the download package.
=========================================================
Now as my computer is using DHCP (unknown location), if I install SAP NetWeaver 04s SP7, do I need to disconnect my comp from the Network and then install the MS loopback adapter ? or Its ok to ignore the DHCP option as my comp is already using DHCP ?
Thanks and Best Regards
Ayub.

Hi Ayub,
U dont need to disconnect ur computer from network. Just install a microsoft loopback adapter and assign it a static ip, and assign that ip and hostname on windows\etc\hosts file. it will installs on loopback adapter and ur local network connection will be as it is.
hope it will help u.
Regards
Subhash

DHCP server hang up and not responding

Hi,
I have log time DHCP server on W2K8 R2 for 3000 wireless users. Now i have problem with this server - log contained many same DHCP renew requests (about 250 per second):
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
02,03/17/11,15:05:41,Audit Log Paused,,,,,0,6,,,
and server not respond for any other user.
How resolve this problem ?
Thanks,
Ladislav

Hi Ladislav,
Thanks for posting here.
Have you recently modified any DHCP configuration ? was only this client host recorded when this issue occurred ?
This seems like an attack from this client computer “ Monca-PC “, could you verify if this client computer has been installed antivirus and up the virus
definition to date?
For troubleshooting ,you may temporarily deny lease address for this host by setting MAC based filtering on Windows server 2008 R2 host and try restarting DHCP service.
Meanwhile, we may need to collect more information form server and this problematic client ,please take look the DHCP event log and post any full error or warring
event here for further investigation.
DHCP Server Events Tool
http://blogs.technet.com/b/teamdhcp/archive/2009/03/20/tool-to-read-dhcp-server-events-for-windows-server-2008-r2.aspx
For more information please refer to the links below:
Monitoring DHCP Server
http://technet.microsoft.com/en-us/library/dd183708(WS.10).aspx
DHCP Server Performance in Windows Server 2008 R2
http://blogs.technet.com/b/teamdhcp/archive/2009/06/29/dhcp-server-performance-in-windows-server-2008-r2.aspx
Thanks.
Tiger Li
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SUN and Microsoft NT 4.0 DHCP Server

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