DHCP exclude address range option config on Instant 2.0
Q: DHCP exclude address range option config on Instant 2.0
A: This article applies to Instant 4.2 and above.
Before 4.2, Use exclude-address as a range option was not available.
Since IAP is getting used as an Edge device, the features needs to be in compliance with industry standard.
From 4.2 onwards, IAP local DHCP server will support exclude IP address as a range.
With this feature we are supporting the following
A. exclude-address ip1
B. exclude-address ip1 ip2
Show dhcps command will show the excluded range and available range
I found this on TCPIPGUIDE.com that supports my findings.
"One difference between BOOTP and DHCP is that certain communications from the client to the server are unicast. The most noticeable instance of this is when a client tries to renew its lease with a specific DHCP server. Since it sends this request unicast, it can go to a DHCP server on a different network using conventional IP routing, and the relay agent does not need to be involved."
Similar Messages
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Hi all,
i would ask you how can i modify my ip dhcp excluded-address .
My situation is like below:
ip dhcp excluded-address 10.22.93.1 10.22.93.20
ip dhcp excluded-address 10.22.93.199 10.22.93.254
WIFI
network 10.22.93.0 255.255.255.0
default-router 10.22.93.1
lease infinite
I would modify ip dhcp excluded-address 10.22.93.199 10.22.93.254 in ip dhcp excluded-address 10.22.93.230 10.22.93.254
it's enought do:
no ip dhcp excluded-address 10.22.93.199 10.22.93.254
ip dhcp excluded-address 10.22.93.230 10.22.93.254
Please answer me.
Regards
PaoloUse
This command prevents IP addresses from being assigned by the router's DHCP server. This is used to prevent IP conflicts with statically assigned servers and routers.
Syntax
Router(config)#ip dhcp excluded-address <low IP> <high IP>
Example
First we configure the DHCP server with ip dhcp pool and exclude the ip addresses.
R2(config)#ip dhcp pool R1_Pool
R2(dhcp-config)#network 10.22.93.0 /24
R2(dhcp-config)#dns-server 4.2.2.2
R2(dhcp-config)#default-router 10.22.93.1
R2(dhcp-config)#exit
R2(config)#ip dhcp excluded-address 10.22.93.230 10.22.93.254
Currently R1's Fa0/0 does not have an IP address
R1(config-if)#do show ip interface brief | ex unass
After we configure ip address dhcp on R1's Fa0/0, it receives an IP address of 10.22.93.1
R1(config)#int fa0/0
R1(config-if)#ip address dhcp
R1(config-if)#
*Mar 1 00:40:36.339: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.22.93.2 (FastEthernet0/0) is down: address changed
R1(config-if)#
*Mar 1 00:56:44.903: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 10.1.1.100, mask 255.255.255.0, hostname R1
R1(config-if)#
*Mar 1 00:41:21.567: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.22.93.2 (FastEthernet0/0) is up: new adjacency
R1(config-if)# -
Hi there,
I was wondering if there was a way to change the built-in DHCP server address range from 192.168.1.x to, say, 192.168.0.x? For example, when you change the router IP from 192.168.1.1 to 192.168.0.1. I noticed that when you commit such a change, the DHCP range does not update accordingly. Any ideas?
Thank you,
Paul
Solved!
Go to Solution.Your DHCP server range should update automatically to the 192.168.0.x subnet when you change your "Local IP address" to 192.168.0.1. Be sure to use a computer that is wired to your router when you do this. Also, be sure to click on "Save Settings", then wait (3 to 60 seconds) for the screen to refresh. You will likely be disconnected from the router when you do this. Do not worry about this. Power down the router and your computer.
Next, wait 30 seconds, then reboot router and computer. Your Local IP address and the DHCP server range should now have the same subnet. -
DHCP assign address range to AD computer groups - possible?
Not by OU, no. DHCP doesn't interrogate AD.
Hello
Does anyone know if it's possible to get the Windows DHCP server to assign an address range to a group of computers in Active Directory? Is it possible?
This topic first appeared in the Spiceworks Community -
Windows 2008 DHCP Server Address Range and Exclusion Range
Hi ,
I have a couple of Doubts regarding DHCp windows 2008 server
1) The DHCP server is given a static Ip in a network series eg(192.168.1.x) starting Ip is 192.168.1.1 to 192.168.1.254 ,
and if the range is from 192.168.1.10 to 1.250 ,
Should the DHCP server be not given an Ip in the DHCP range specified ?
ie the DHCP server static IP should not be in the 192.168.1.10-192.168.1.250 , ( I have given as 192.168.20.5)
Even though the Exclusion range can be specified , Just want to know if this is best practice.
2) And next setting up the range , should we give the entire network address as range ( eg 192.168.1.1 to 192.168.1.254) and set exclusion range
or take a particular series (eg 192.168.10-100)
Please advise
Thanks in Advance
Regards
Anand MYour DHCP server range should update automatically to the 192.168.0.x subnet when you change your "Local IP address" to 192.168.0.1. Be sure to use a computer that is wired to your router when you do this. Also, be sure to click on "Save Settings", then wait (3 to 60 seconds) for the screen to refresh. You will likely be disconnected from the router when you do this. Do not worry about this. Power down the router and your computer.
Next, wait 30 seconds, then reboot router and computer. Your Local IP address and the DHCP server range should now have the same subnet. -
EA4500 Won't get a DHCP WAN address from Cable Modem
I have an EA 4500 that I used to replace a bad WRT45 (or something like that). We have an ADT camera system that allows you to view the cameras locally and remotely. All I have to do is set a static internal address on the DVR and the public IP on the router in the application. I duplicated the setting in the old router and everything was running smoothly. However, the speed test result I was getting from the router and speedtest.net were not even close to what we were paying for (wireless and wired. But it was functional.
I called Comcast and they said we needed a Docsis 3 modem. So, I went to the Comcast office and they traded out my modem for a docsis 3. Hooked it up and everything was working again. Speeds were better but not really up to par. Hooked my laptop directly into the new modem and I was getting speeds off the charts. Frustrated, I called Comcast, they said the modem needed to be put in Bridge mode. Then the EA4500 wouldn't get a DHCP WAN adress. They took it out of bridge mode. Same result.
They sent a tech out (Mind you I've been a Network Engineer for almost 20 yrs) and he tells me they gave me the wrong modem (I wasn't there either, roommate let him in). He replaced the modem with a new all inclusive router/switch/wifi modem. He then proceeds to setup a whole new network, which of course , except the laptops that connected, my devices don't see ( printers, cameras, dvr, etc). Then, this baffles me... he did a factory reset on my EA4500. So now there are 2 seperate networks one with slow Internet and one without WAAN services.
After all this, my EA4500 still will not get a WAN address when plugged into the new modem. I would just use their new modem but to make any config changesto it, something as simple as changing the SSID name or the password, you have to call them. They won't give you access to the admin page.
Anyone have any ideas why my EA4500 won't get a WAN address? Oh, btw, I did do a MAC address clone on the EA4500 while connected to the modem and it DID get the address, but the speeds were dismal, not even 1mb up or down.@stix180
There is a need to reset and reconfigure the EA4500 router to work with the new modem. There are certain configurations on the router that will make it work for a particular modem, and this might be causing the issue. Cable modem authenticates end users through username and password but there are cable modem/router as well in which the IP address are on the same range with the default IP address of the router. Please try to check the IP address of the computer wired directly to your modem, it should not be on the same IP address range with the EA4500 router since it will cause IP address conflict. You can change the default IP address of your router from 192.168.1.1 to 10.10.10.1. Please try to make sure that your router also has the latest firmware version installed. And it would help if you do port forwarding on the router for your camera and DVRs to resolve NAT issues. -
So when I'm assigning DHCP addresses using Apple's airport, I have the option of addresses beginning 10.0.x.x, 172.16.x.x., or 192.168.x.x. What are the differences between these three options? Or are there no essential differences?
None really. These are the three IP Address ranges available for Private Networks. The Internet Engineering Task Force (IETF) has directed the Internet Assigned Numbers Authority (IANA) to reserve these IPv4 address ranges for private networks. This has been published in RFC 1918.
More info: Wikipedia: Private network -
Limitation on source group with services using ip address range
Hello,
I have an interface on CSS which I regard as public and another interface I regard as private. On the private interface is a server farm with private ip addresses. Since the server admin guys insisted the servers need to access internet just for Windows Update, I made a source group to NAT the private addresses to public addresses to allow the servers to access internet.
I defined services for use by the source group. Since keepalive is not important in this case, I set keepalive none to ,I hope so, save system resources.
I have server 192.168.1.1-5 (5 servers) and 192.168.1.11-14 (4 servers), so I made a service with ip address 192.168.1.1 range 5 and another service 192.168.1.11 range 4.
But then I found that the two services cannot be put in the same source group. It is because of the different range in the service definition.
I can get it work if I define services with single ip address, but then I will have a long configuration with repetative information. And I think this may be using more system resources.
I can also get it work if I include 192.168.11.15 and define two services both with a range of 5 ip addresses. But 192.168.11.15 is not actually there.
Why is there such a limitation on source group, or services with ip address range? Is there the same limitation for content rules? Or am I getting it all wrong and should do the configuration in other ways?
Advices will be welcomed.
CT Yau
Hong KongYes you are correct. There is a limitation while adding services into source groups.
You can create as many services that share an ip range (eg. a /24 subnet range). But the trouble starts when you add them into source groups. You can not add them into a source group NOR you can add them under different source groups as well.
You mentioned that you can use single ip adress instead of range for the services...but it is not true as you will be stuck when you add them into source groups.
I can think of these following options in your case.
Option 1
Change the ip range on the servers. Use 2 different IP ranges one for those 5 servers and another for those 4 servers.
Create 2 services for each range.
Create 2 groups and add the services.
service server-out-192.168.1.1-5
ip address 192.168.1.1 range 5
active
service server-out-172.168.1.11-14
ip address 192.168.1.11 range 4
active
group server-out-192.168.1.11-14
vip address x.x.x.1
add server-out-192.168.1.1-5
active
group server-out-172.168.1.11-14
vip address x.x.x.2
add server-out-172.168.1.11-14
active
Option 2
Create a service that includes all the ip addresses starting from 192.168.1.1 through .14 using the range keyword.
Now you need to create one source group with a VIP. Add the service to the source group.
If you do not want to cover the unassigned ip addresses just move them up and use consecutive ones.
service server-out-192.168.1.1-14
ip address 192.168.1.1 range 14
active
group server-out-192.168.1.11-14
vip address x.x.x.x
add service server-out-192.168.1.1-14
active
thanks -
Hide the Range Option in Multiple Selection screen
Hai,
I Give the values In single Values In Selection Option Screen.
I want to need Hide the Range Option Include or Exclude In Multiple selection screen.
Regards,
Geethajust check this it may help you
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/840ad679-0601-0010-cd8e-9989fd650822">https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/840ad679-0601-0010-cd8e-9989fd650822</a>
here restricting the selection screen
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shiba dutta -
DHCP beginning address problem.
Hi guys,
I cannot understand how to configure my TC. I put exactly the same network settings as they were in the Airport Express to share the Internet connection. Everything works fine except the internet itself. The problem as I see it is that dhcp beginning address cannot be set far away from the static IP. In my case, the static IP is 213.170.70.** and I only can change these ** last figures in the dhcp range.
But this conflicts with my provider and I have no internet while the TC itself works fine. If I set "share the only address" it doesn't help either.
Anybody can help?
Many thanks in advance.None really. These are the three IP Address ranges available for Private Networks. The Internet Engineering Task Force (IETF) has directed the Internet Assigned Numbers Authority (IANA) to reserve these IPv4 address ranges for private networks. This has been published in RFC 1918.
More info: Wikipedia: Private network -
SBS 2011 - Need to change Machine name and IP address range
We had upgraded to SBS 2011 and new hardware 6 months ago, we have recently been aquired by a larger company and want us to comply with their machine naming conventions and change the IP address range to fit in with their corporate structure. They
will be supplying us with a 2011/2012 Domain controller, this is to be added to our existing network as the primary DC supplying DNS, DHCP, WSUS
We use our SBS box for DNS, DHCP, Exchange, File server, Print server
How difficult is this going to be? Is it actually possible, or do we need to wipe the SBS box and install from scratch?Any help on this matter would be appreciatedAs said, you can't change the name of the server or the domain, but you can change the IP addresses.
The bad news is that you can't integrate SBS to a larger corporate network. SBS needs to be at the root domain of the forest and hold all FSMO roles, and it can't have any trusts.
If the corporate wants to bring in a DC of their own AD domain and wants all clients to be joined to that domain, you just can't use SBS anymore, it won't fit in. You need to inform your corporate IT about the situation, and you need to make a new plan.
You will need some kind of migration from SBS to standard products first before you can join to the corporate network structure.
Tero Leskinen - MVP (Windows Server for Small and Medium Business / SBS) -
Cisco E1000 wont connect to internet anymore - not getting DHCP ip address from Comcast modem
Very strange issue...
I have Comcast HSI and have been using my Cisco (Linksys) E1000 for about 3 years now. Bought it as a refurb.
My issue is that the E1000 is NOT receiving the DHCP info from my Comast modem.
The internet works when my laptop is directly attached to the modem; but when connecting the modem internet port
to the E1000 internet port it is NOT grabbing my ISP DHCP ip address thus no clients can broswe 'wired or wireless'.
I even updated the firmware and am starting to think its time to get a 'BRAND NEW' router as this makes NO SENSE!
I cannot release/renew as i have NO ip address to release. I have even tried to configure the E1000 as a static
using the ipconfig/all from when the laptop and modem was connected. Comcast says they see nothing on their end.
I also factory defaulted the router and redid the config to no avail.
Any help would be appreciated.
Solved!
Go to Solution.You need to enable MAC address clone on the router to recognize the connection from your cable modem. The link below would tell you how to configure the router to work with a cable connection and how to do MAC address clone.
Setting up a Linksys router with Cable Internet service -
Automatic computer discovery by IP address range
My domain is a subdomain of a parent domain and I only manage devices in my own subnet with static IPs. I am just installing SCCM2102 r2 as a trial version! at step 1 to configure and devices to manage, I don't see an option to scan devices via an IP address
range! I don't want to scan entire root domain in which I don't manage. Is that option available somewhere in SCCM 2102 R2? thanks.
Thang MoThere is also a network discovery that can be used to discover devices in a specific subnet. It's not very often used, as it cause lots of overhead and discovers also devices that you don't want to manage (see also:
http://technet.microsoft.com/en-us/library/hh427340.aspx#BKMK_ConfigNetworkDisc).
Also keep in mind that you don't need to discover the devices that you want to manage. It just makes it easier to install clients on them. Without discovering you would need to manually install the clietns.
My Blog: http://www.petervanderwoude.nl/
Follow me on twitter: pvanderwoude -
Determing IP Address Ranges for Setting up a VPN
Following the directions that I've found here ... I'm attempting to setup a VPN for my company to share documents.
I am using a mac mini, which is connected to a router, and the router to a cable modem.
In order to set up the VPN using L2TP over IPsec, I need to enter both a Starting and Ending IP Address.
I have found only a single IP address for the mac mini, and when going into system profiler have found various other addresses and am not sure how to properly setup the IP Address Range.
Some of the categories shown in the System Profiler are:
IPv4 Addresses, IPv4 Configuration Method, Interface Name, Router, Subnet Masks, IPv6 Configuration Method, DNS Server Addresses, etc.
However, I only see 1 single IP Address.
Any help would be greatly appreciated.
~ JJLOK, that's good, you have all you need.
You are probably going to need to read up on the management of the base station as this is going to be your NAT router (remember that from my earlier post?) and your internet firewall. Management will be via a web browser, on a computer directly connected to base station's ethernet port. There will be a default IP address to put into the web browser to reach the management page. This IP address can probably be found by opening the Network prefs on one of your airport computers and looking to see what the 'Router' IP is set to (I'm presuming that the base station is still in its default function). It will also be in the base station documentation.
The base station will act as your DHCP server (we could alternatively use the server but lets keep it as the base station - no real difference). There will be a management page for this where you can specify its own IP address and also what range you want to distribute to other computers. For example...
192.168.1.1 for base station
192.168.1.2 to 192.168.1.40 for DHCP
Remember, we do not want to hand out all the IP addresses by DHCP because we need to keep some back for the server's static IP and the VPN users. So maybe we keep...
192.168.1.100 for the server
192.168.1.200-219 for L2TP vpn
192.168.1.220-239 for PPTP vpn (if this is also needed for PCs and the like).
Via management screen, confirm that NAT routing on the base station is enabled (this allows all LAN computers to access internet via your base station which is now your 'Internet Router'.
Confirm that the firewall on the base station is enabled. This protects your LAN (on the private side of the router) from all other traffic on the internet (the public WAN).
Switch off both the modem and the base station.
Connected the modem to the WAN port of the base station (ordinary ethernet cable).
Keep modem off for 5 - 10 minutes (this clears any cached settings at the ISP end). Switch on the cable modem and wait a few minutes for it to settle.
Switch on the base station and reconnect to the management screen. There will probably be an Internet Wizard or some such thing in the management page to establish the connection with the modem.
When the connection to the modem is OK, you should be able to browse rest of internet from the computer you have directly connect to the base station
Restart any computers connected by airport. They should now also be able to browse internet.
Disconnect computer which is directly connected to base station.
The ethernet port on base station now gets connected to your switch.
The Server connects to the switch too.
You are probably going to need to give your server a new IP address, in the same network range as now being used elsewhere in your LAN. This is not quite as trivial as just changing it in the Network Prefs although you may well be able to get it going fine doing just that (to be honest, I'm not sure I want to add that bit into this already lengthening post
If you want to just change the IP address in Network Prefs just now, remember that the Router field will be the IP address of your base station. The DNS server (in server network prefs) will also be base station.
I have skipped past a bit regarding the server setup and also omitted how to get the vpn traffic from the WAN to the server (hint: port forwarding in router) but i think it is wise just to get the rest of the network up and running behind a secure router/firewall first.
-david -
Enabled RBL - Cannot send from dynamic address ranges
I have recently enabled some RBL on my mail server to help combat some spam problems that have been starting. Unfortunately, some users can no longer send email through my server when they are working remotely. I am pretty sure they are being blocked because they are on dynamic address ranges (Comcast home accounts and Verizon air cards).
Is there a way to:
1) (preferred) Allow SMTP to go through without looking up the RBL (white-listing) based on SMTP authentication? This way they could me anywhere and always be able to send.
or
2) How do I white-list address ranges so that they can send through.
ThanksBased on your reply, it sounds like postfix processes its config in a top to bottom fashion. It now makes sense to me that it must be getting to the RBL's before authentication. Below is my postconf, any help would be greatly appreciated. Thanks
xserve0:~ root# postconf -n
alias_maps = hash:/etc/aliases,hash:/var/mailman/data/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mapsrbldomains =
messagesizelimit = 0
mydestination = $myhostname,localhost.$mydomain,localhost,mail.intrix.org,intrix.org
mydomain_fallback = localhost
myhostname = xserve0.intrix.org
mynetworks = 127.0.0.1/32,64.193.94.128/28,75.0.0.0/8
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
ownerrequestspecial = no
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpdclientrestrictions = permit_mynetworks rejectrblclient zen.spamhaus.org rejectrblclient dnsbl.sorbs.net rejectrblclient list.dsbl.org rejectrblclient bl.spamcop.net permit
smtpdenforcetls = no
smtpdpw_server_securityoptions = cram-md5,gssapi,login
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpdtls_certfile = /etc/certificates/Default.crt
smtpdtls_keyfile = /etc/certificates/Default.key
smtpduse_pwserver = yes
smtpdusetls = yes
unknownlocal_recipient_rejectcode = 550
virtualmailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp
xserve0:~ root#
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