WRVS4400N : DHCP not assigning IP addresses if WAN link is down

Hello,
With the latest firmware installed (the one suporting fixed IP based on MAC), I have one problem: the DHCP server is not assigning addresses when the WAN link is down. When it is up, it generally assign IP based on the configuration binding (MAC/IP). But it sometimes fail to do so. Before using the wrvs4400n I had no issues with DHCP wrt54G and other routers.
Any hints ?
Thanks.
V.

Hi there!
Thanks for contacting the business support - other guys got the same problem.
I'm now back on firmware version 1.00.16 and everything works fine.
But the new features were nice to have!

Similar Messages

DHCP server does not assign IP addresses SG500 firmware 1.3.5

good day collegues
has any of you come across the following issue:
my switch (after upgrading to the newest firmware 1.3.5) does not assign IP addresses to some of the hosts.
after a couple of hours I managed (do not even how) to force my switch to assign IP addresses only to some of the hosts.
still some of them cannot get the IP address and remain with "funny" IP address like i.e. 169.254.100.100
additional info
1. if I boot my switch with the previous version of firmware (1.3.0.6) everything is OK. all my hosts get correct IP addresess
2. the hosts which do not get IP address were perviously entered in stat host table - now removed, ARP cleared, etc, everything many many times rebooted.
I ran out of ideas, could you pleae give me some hints ?
the config below:
config-file-header
SG500
v1.3.5.58 / R750_NIK_1_35_647_358
CLI v1.0
set system mode router queues-mode 4
file SSD indicator encrypted
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end zzz
no spanning-tree
vlan database
vlan 11,13-14
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
no ip dhcp snooping verify
ip dhcp snooping information option allowed-untrusted
ip dhcp snooping vlan 11
ip dhcp snooping vlan 13
ip dhcp snooping vlan 14
ip arp inspection logging interval infinite
green-ethernet energy-detect
no eee enable
arp timeout 1
ip dhcp server
ip dhcp pool host q409
address 10.10.11.2 255.255.255.0 client-identifier 01:00:08:9b:ac:8f:92
default-router 10.10.11.254
dns-server 10.10.10.1
exit
ip dhcp pool host PCH-100
address 10.10.11.10 255.255.255.0 client-identifier 01:00:06:dc:41:ef:ef
default-router 10.10.11.254
dns-server 10.10.10.1
exit
ip dhcp pool host q209
address 10.10.13.3 255.255.255.0 client-identifier 01:00:08:9b:ac:72:ba
client-name q209
default-router 10.10.13.254
dns-server 8.8.8.8
exit
exit
ip dhcp pool network HOME
address low 10.10.11.1 high 10.10.11.254 255.255.255.0
lease infinite
default-router 10.10.11.254
dns-server 10.10.10.1
exit
ip dhcp pool network GUESTS
address low 10.10.14.1 high 10.10.14.254 255.255.255.0
lease infinite
netbios-node-type b-node
default-router 10.10.14.254
dns-server 10.10.10.1 62.233.233.233
exit
ip dhcp relay address 10.10.10.1
ip dhcp relay address 10.10.11.254
ip dhcp relay address 10.10.13.254
ip dhcp relay address 10.10.14.254
no boot host auto-config
no qos
qos advanced-mode trust dscp
qos wrr-queue wrtd
exit
hostname SG500
line telnet
exec-timeout 0
exit
logging buffered debugging
no logging file
aaa authentication login Telnet local
aaa authentication enable Telnet enable
aaa authentication dot1x default none
line telnet
login authentication Telnet
enable authentication Telnet
password 999 encrypted
exit
no passwords complexity enable
passwords aging 0
username 999 password encrypted 999 privilege 15
ip http timeout-policy 0 http-only
clock timezone " " 1
clock summer-time web recurring eu
clock source sntp
clock source browser
sntp unicast client enable
clock dhcp timezone
ip domain name 999
ip name-server 10.10.10.1 62.233.233.233 8.8.8.8
ip host 999 10.10.13.3
ip telnet server
no service mirror-configuration
no security-suite deny syn-fin
security-suite syn protection mode disabled
interface vlan 1
ip address 10.10.10.254 255.255.255.0
no ip address dhcp
interface vlan 11
name HOME
ip address 10.10.11.254 255.255.255.0
ip dhcp relay enable
interface vlan 13
name DMZ
ip address 10.10.13.254 255.255.255.0
ip dhcp relay enable
interface vlan 14
name GUESTS
ip address 10.10.14.254 255.255.255.0
ip dhcp relay enable
interface gigabitethernet1/10
description "(99) QNAP 409"
switchport trunk native vlan 11
exit
macro auto disabled
macro auto processing type host enabled
macro auto processing type ip_phone disabled
macro auto processing type ip_phone_desktop disabled
macro auto processing type router enabled
mac address-table aging-time 10
ip default-gateway 10.10.10.1
snmp-server set 999 permit

Hi Andbor, please make a backup config of your file, factory reset the switch.
After this, manually configure a DHCP scope without any other configuration.
Just something simple like this
ip dhcp pool network GUESTS
address low 10.10.14.1 high 10.10.14.254 255.255.255.0
lease infinite
netbios-node-type b-node
default-router 10.10.14.254
dns-server 10.10.10.1 62.233.233.233
Verify your machine receive IP address with no other configuration.
In some ways, I'm afraid some of your connections black listed due to the arp inspection.
-Tom
Please mark answered for helpful posts

Help needed : DHCP not assigning addresses on VMware. click for more details.

Hello people of technet,
I'm new to this forum I was told I could get some help here. I need your help with an issue that I have on my network. As the title says, my DHCP server is not assigning addresses from a specific pool.
Information about the topology:
I have to sites linked with a VPN site to site connection. In the first site I have a DHCP Server, In the second site I have a client that should get an address automatically from the DHCP. I installed a DHCP relay agent on the server that manages the VPN
connection on the second site with a correct configuration. All other configurations are done right I verified a couple of times. I checked the connectivity with a ping test between the client (with static address for the test) from the second site to the
DHCP server from the first site, it is all working. The problem is that the DHCP server is not assigning addresses from the specific pool. All machines (4) run on windows server 2008 r2.
Thank you for your time and support, just tell me if you need more informations.

I fixed the problem it is working now, apparently it was the VMnet cards that caused the issue I've just reseted their configuration to default state. I've had the idea after you asked me to check DHCP address assignement on the same site. One more thing
to do now, switch from the workgroup to a domain.
Thank you for you time.

5Th Gen AE Does Not Assign IP Address in Bridge Mode

I have three AEs in my house...two of which are 4th gen and one is 5th gen, and two of which are set up as bridge (a 4th gen and a 5th gen). The 5th gen does not generate ip addresses reliably...everytime I go to the room where the 5th gen AE is I have to turn off the wifi on my device and turn it back on to get an ip address. This happens 100% of the time. I have tried my MBP, as well as my iPhones (4s and 5.) I also noticed the ip address that is being assigned for the bridges is of totally different denimination. The 4th gen bridge gets an ip of 10.0.1.4 where as the 5th gen gets a 192.168.1.76...the DHCP address range for the main is 10.0.1.2 through 100 and it should be assigned one of those ips. I'm kinda suspecting this is why the bridge is not working properly. I just don't understand why this unit is acting this way. Any input to help solve this mystery will be greatly appreciated. CHEERS:-)

Did resetting to factory help this issue? I'm having the same problem with my 5th and 3rd gen AE's. I've added a new router (pfSense) and only need the AE's for access points. The following is the result on some problem tracking:
Working on my network ip addressing issue. I shut everything down. I brought up my internal wired network of pfSense router, internal switches, appleTv units, printers and a couple of computers. All Addresses were correctly assigned. I released/renewed the ip addresses to check if the address assigned would remain correct, and this test passed.
I then connected my cable modem to the internet, which connected with no problem. I then again tested release/renew of addresses, and this test pasted with no problems. And I had internet access.
My internal network follows the 10.0.1.xxx address range. I leave 20-99 open as my dynamic range, and assign my AppleTv, DirecTv, SlingBox, and MacMini server to static addresses via MAC reservation. All these are functioning correctly.
Final test. I add my Airport Extreme 5th gen, which is in bridge mode, with no guest network, and the light turns green. I open up my MacBook, connect via WiFi, and the address is 192.168.100.34, not correct. I turn WiFi on my MacBook off, then I turn it on, after three cycles I get a correct ip address.
I confirm via airport utility my settings. I see nothing to change. I replace my Airport Extreme 5th gen , with my older Airport Extreme 3rd gen, and I once again get a 192.168.100.22 address which is not correct. I cycle the WiFi setting in my MacBook and after a few cycles, I get a correct address.
My DHCP server is an older Dell system running the linux based software pfSense. I made this change after I started getting bad IP addresses from my Airport Extreme 5th gen. My cable modem is a Zoom 5431J DOCSIS 3.0. But my first test was verifying the assignment of addresses from pfSense, without the cable modem.
I've powered off both Airport Extremes and have checked the settings. Not sure what else I might try with these Extreme units.

DHCP not delivering IP addresses

I had DHCP enable and everything working great. After a manual reboot of the system, DHCP is not delivering IP address to the clients.
If I insert the values manually, everything works.
Any ideas?

Ater restarting everything works... :s

Thinkpad 430u Windows 7 - Public Network - Wireless router is not assigning IP address

Hello,
My computer knowledge is limited, but I have a chronic issue when attempting to connect to public wireless networks, ie a coffee shop:
When I attempt to connect, the laptop identifies the public network as an Unidentified Network and although it "connects" it says No Internet Access. Normally, when I connect, I would be prompted to selected Home, Work, Public and this does NOT happen. In the Network and Sharing Center, under the heading "View your active Networks" it says Unidentified Netowork, Public Network; Access type: No Internet Access, Connections: Wireless Network Connection (name of network). The words "Public Network" is NOT a hyperlink and cannot be clicked on.
When I run run cmd and check ipconfig I find that the wireless router is not assigning an ip address to my laptop. i then input ipconfig/releasei, and ipconfig/renew. I then receive and error saying "An error occurred while renewing interface Wireless Network Connection: The operation was canceled by the user."
I have turned off my firewall.
My smart phone can connect the the internet with no problem and the other laptop users have no problem either. This indicates there is no problem with the wirless router itself, but is some kind of setting or something that needs to be adjusted on my end.
Autoconfiguration IPv4 Address: 169.254.86.100
Subnet mask: 255.255.0.0
Default gateway: n/a
Please, any help is appreciate. This is a chronic problem any time I link to public networks.
P.S. I have no problem connecting to the internet in my own home
Thank you!!

Sorry, forgot to include: it's a 2Wire 2701hg-b Residential Gateway. I'm unsure how old the model itself is--it was just given to us by AT&T (it's the model they use for their U-verse service). I checked today and the firmware is up-to-date.
Thanks.

Apple Time Capsule Not Assigning IP Addresses

Briefly here is my setup
Internet is supplied to my building by ISP(I have no router) => apple time capsule connected by Ethernet. I have used WIFI to connect all of my devices in the past with no problem until i moved into this place. I have 2 macbooks that can connect without any issues Every single other device in the house cannot connect and does not receive a proper IP Address. The ones being assigned are in the 169.xxxxxx range. Even if i plug my Imac (which cant connect) directly in from the wall via ethernet, it wont connect. The time capsule is setup as a bridge with DCHP set to run automatically. I have reset everything numerous times and restored the router to no avail. I called the ISP and they said it wasnt their problem. I was under the impression they werent assigning the IP Address correctly or something. Im stuck and need some help. Thanks

Since you do not have a router there to assign IP addresses to devices on your network when the Time Capsule is in Bridge Mode, you will need to configure the Time Capsule to "Share a public IP address" so that it will distribute IP addresses to connected devices.
AirPort Utility > Manual Setup > Internet icon> Internet Connection tab
Connection Sharing = Share a public IP address
Update to save settings
This may possibly produce a Double NAT error on the network, so you will need to click to "ignore" if that errror message appears.

DHCP Self-Assigned IP Address: No Cable Connection to Router Problem

Hi. I work in different office environments. At home with Time Machine and wireless everything works fine and I can connect to internet and work wireless and also with cable.
In the office _I need to use the cable_ to connect to a dlink router:
I CANNOT CONNECT WITH CABLE but wireless works.
I set MacBook Airport/Ethernet config to "using DHCP": wireless connects, cable pulls some IP address but none of the assigned router IP addresses.
Tried:
deleting Ethernet connection, rebooting
rebooting router
manually setting IP address: effect: it says "connected" but no internet/ping possible
setting a predifined IP address in the router: no effect
Please, I hope someone could help.
Thank you

I think you are right that the problem is some combination of software (Leopard) and hardware. At first, I thought it was just the MacBook Pro (or some models of it since obviously not everyone seems to have the problem and Apple is not publicly acknowledging it. I have been working with a friend who has a Verizon home network using their wireless router from Actiontec. At my house, all three of my Macs, a G4 desktop, a G4 iBook and a G3 iBook all running 10.4.11 Tiger all work flawlessly with Verizon FIOS using the same router as my friend's. And, at his house, my G4 iBook also works fine wirelessly. So, too, does his wife's MacBook (not sure which model but bought within the year). But, my friend's MacBook Pro will NOT access the Internet wirelessly, but works just fine as long as it is connected with an ethernet cable.
So, it is not the router that is the problem, and it is not that portion of the Leopard OS that obtaines a DNS server from Verizon since the MB Pro can do this with a hardwire connection. It appears to be something in the combination of that portion of Leopard's OS that deals wirelessly with the router -- and not ALL routers either because this same MB Pro CAN use a Verizon DSL modem wirelessly at another location!
We have, of course, tried everything to get this to work, and read extensively online trying to find an answer. There are no answers online, at least as far as we have explored. So, we are off to the Apple Store shortly to see if their Geniuses have something more profound to tell us that they have been keeping secret from the world as to how to make this thing work. If they fix it, I will insist they say how, and why they have not made the fix public; if it is a hardware problem, as I suspect it is, then they need to announce a recall of this model MacBook Pro.
What still leaves me mystified is why YOU have a very similar problem not getting on the internet, yet all software indications are that you are in contact with your Verizon router with MACBOOK!
One more thing: I believe the problem is really with the airport card in some Macs, pro or otherwise. The software in the OS is telling us users that there is a live signal being received by the computer when it isn't. E.g. I tried to access friend's router via the 192.16.1.1 address in a browser; no go, so there in fact is no wireless connection even though I am being told there is; however, I still do not understand why the Airport menubar menu indicates the correct router ID (name) shows in it!
Rgds

Cisco Flex Connect and users can not get IP Address by WAN

Hello my name is Ivan
I have a wlc 5508 with license base to 50 aps, i use a deployment flex connect. I already registered all my access points, I use web authentication to authenticate users guest, and the service dhcp is in the central site.
My issue is the users in each remote site, can not get an ip address by dhcp from the central site, they can authenticate in the guest ssid, but any users can not get an ip.
The request is passing by the wan in this way
Central Site DHCP - Router WAN - Remote Site - Users with notebooks. I use flex connect central deployment (all the traffic consulting to the wlc) .
perhaps i should use local deploy? The wlc is in the central site.
Can you help me to resolving this issue please? , perhaps any advice?
Regards
Ivan.

Thanks Osita
If I configure Central Authentication and I configure central switching I need to create a dynamic interafce for each remote site and each dynamic interface associated with a different VLAN ID, because I can not associate a single interface dynamic to the same VLAN ID, but in my case the client remote in each remote site have the same network segment with the same VLAN ID with the same SSID for guests. My goal is to configure web authentication with the local DHCP server at each remote site, will this work?.Each remote site have its own server dhcp.
If I configure authentication central authentication with central switching with web authenticacion as I set in my scenario?
My issues are the interfaces dynamics, because I have the same network to the customer guest with the same ID VLan in each remote site
Regards

AP12000 can not assign IP address to client

upgrade to the latest firmware.
want to setup ap1200 as a dhcp server for wireless client. but it seems there something wrong with setup. client cannot get IP address from AP. please take a look my configuration
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
hostname xxx03
enable secret xxx.
username admin password xxx
ip subnet-zero
ip dhcp pool xxxpool3
network 192.168.105.72 255.255.255.248
default-router 192.168.105.65
domain-name xxxx.com
bridge irb
interface Dot11Radio0
no ip address
no ip route-cache
ssid XXX WLAN
authentication open
guest-mode
speed basic-1.0 basic-2.0 basic-5.5 basic-11.0
rts threshold 2312
station-role root
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding
bridge-group 1 spanning-disabled
interface FastEthernet0
no ip address
no ip route-cache
duplex auto
speed auto
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
interface BVI1
ip address 192.168.105.69 255.255.255.192
no ip route-cache
ip default-gateway 192.168.105.65
ip http server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag/ivory/1100
bridge 1 route ip
line con 0
line vty 0 4
login local
line vty 5 15
login
end

You will need to provide some additional detail about your setup.
Version of CRM?
Is IDF and/or ADFS setup?
Some basic things to check:
From the client computer, does a nslookup of the CRM server name resolve? If not, it may be a DNS issue.
Is the CRM site in IIS listening to all IP addresses? Or set to listen to only one?
Was a host header set up in IIS for the CRM site?
What error do you get when you use the CRM server name from the client machine? Only IP addresses working is a sign of a kerberos issue. Check that you have the correct SPN's created for a non machine account running the CRM app pool in IIS.
Jason Peterson

Router not assigning network address

I have the Verizon FIOS Actiontec router. The wired connection is great but the wireless connection is nothing but trouble. My wireless computers see the wireless network and say they "connect" to it, but then they have a problem getting a "network address" from the router - about half the time I get no network address and so can't access my network or the internet. The actual message is "Getting network address" - this stays on for a minute or two and then I get the message that I have no or limited connectivity and I can't connect - even though the network signal I get is "very strong". I try rebooting my wireless computers, re-booting my router and sometimes it connects and sometimes it doesn't - there is no pattern. If I leave my computer alone it will re-try the connection every once and a while and may eventually connect - usually if I wait long enough, but this may be hours or a day latter before it will eventually connect. It is not a password issue because about half the time I have no problem at all, the other half of the time it may be hours or a day before I can connect.
Verizon sent me a new router and I have the very same problem. I never had this problem when I used my own wireless router with DSL (before FIOS). The same problem is true for both a desktop with a wireless connection and a netbook I have (all systems are running xp). I even re-set up my old wireless router in serial with my Verizon router and both computers picked up and connected to the old router right away - I even got internet using this serial set up - but I have other problems with this set up so it really is not a solution - but it was useful in letting me know it is not something with my wireless computers. I even uninstalled and reinstalled the wireless adapter to my desktop and that did not help.
Has anyone else had this problem? Why is this happening? What can I do to fix this? Please help.

How to improve wireless networking on Verizon MI424WR
follow this guide, but you're best bet is to change the wireless channel. that is a relatively painless procedure. There are only three channels in N.America that are useable. Those are wireless channel 1, wireless channel 6 and wireless channel 11.
you probably have some heavy interference on whichever wireless channel you are currently on. One of the three listed should provide good results for you, but you'll want to cycle through each of them to find which channel is the best.
Log into your router
http://192.168.1.1
Default user name is 'admin'
Default Password is 'password1' other variants are 'password', or 'admin'
Once you're logged into the router, stay in the first column and look for change wireless settings.
When you click on that your wireless settings will come up, and you'll see the channels as your number 3 option. simply use the drop down list to choose channel 1, place a check mark where it says something to the effect of "keep these changes even after a reboot" and then hit apply.
wait for it to lock in, try to reconnect to your wireless and try it out for however long it takes to drop off again. if it does not drop off then you are good, if it does, then change it from 1 to 6, and then if that does not work change it to 11.
also take a quick look at the actiontec link at the top. It's very basic but it gives some food for though with regard to things that potentially can interfere with that wireless transmission.

DHCP not handing out addresses

Hi all
I have Windows Server 2008 sp2 roles AD DNS and DHCP.
Several days my server DHCP is "hangs"
a few hours after restart
C:\Windows\system32\svchost.exe -k DHCPServer run on 50 % on procesor and mmc not responding I must before kill proses svchost and start DHCP is
looks good but not response to client PC

Run a free malware scan using the following to make sure there is no infection.
Microsoft's Safety Scanner (gest updated regularly):
http://www.microsoft.com/security/scanner/en-us/default.aspx
MalwareBytes free scanner - update before you run (to use the free version for occasional scans, do not opt to try the free 30 day pro version during installation)
www.malwarebytes.com
Are there any event log errors?
As a test, if you run it without any third party services running, does it do the same thing? To do that, from a Start/Run box, run
msconfig, select Service tab, click on Hide Microsoft Services, then make sure the list left is checked, and disable them, and restart. Run it as a test, and if it doesn't occur, then you know it's third party software doing it.
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.

ISync does not properly retrieve address book data, links broken

Hello,
My syncing attempts with my Motorola phone keep failing (no data is transmitted to the phone; the phone has no contacts currently). I think I can see the problem: iSync has different groups of contacts in its list than that exist in address book. What I mean is: in the dropdown menu in iSync where you can select what group of contacts to sync, it has the groups that I once had in address book, but which are now changed. I think this happened since I installed snowleopard. During my leopard days, I moved some apps to different folders; with the install of snowleopard, I think the links between the apps have not been reset well.
Do you know how to fix this?

The most likely solution is to launch iSync application ,and then in the preferences menu, click on Reset Sync History button. This resets configurations for the iTunes synchronization of calendars and address books.

SG500 - DHCP server does not assign predefined static IP addresses to hosts

hi guys
I upgraded my SG500 switch firmware to 1.3.0.59, since there is a new functionality DHCP server v.4
well I must say I came accross the issue I cannot solve. DHCP server assign dynamic address - no hassles.
troubles start with static IP hosts.
I defined a couple of hosts with static address within the correct subnet. I tried with hardware address and client identifiers. no luck. my switch does not assign the IP address I assigned to the suitable mac address. to define it I use both CLI & Web.
no of them works. any idea ?
below the cut from my config:
ip dhcp pool host HP-Ellite
address 10.10.11.7 255.255.255.0 client-identifier 01:d8:d3:85:cf:09:72
client-name HP-Ellite
default-router 10.10.11.1
exit
ip dhcp pool host VAIO-Z
address 10.10.14.108 255.255.255.0 hardware-address 54:53:ed:1c:a1:46
default-router 10.10.14.1
exit

Tom, thnkas for a quick reply...
look, usually it is pretty easy to manage an issue with so precise instructions. but this particular time it is not.
as I understood the "dhcp option 61" is nothing more than "00" which go before pure hardware address.
so, coming back to my example from the first post
with this configuration, my switch assigns 169.254.110.130 255.255.0.0 address
ip dhcp pool host HP-Ellite
address 10.10.11.112 255.255.255.0 client-identifier 01:d8:d3:85:cf:09:72
client-name HP-Ellite
default-router 10.10.11.1
exit
with that configuration, my switch assigns 10.10.11.11 255.255.255.0 address
ip dhcp pool host HP-Ellite
address 10.10.11.112 255.255.255.0 client-identifier 00:d8:d3:85:cf:09:72
client-name HP-Ellite
default-router 10.10.11.1
exit
otherwords "00" does not work as explained (unless I misunderstood the meaing of dhcp option 61). my switch assigns first available dynamic IP address. atlhough the arp table is cleared, dynamic address table is cleared as well. swtich is rebooted, host is rebooted
once I change hardware address prefix to "01", my host asign itself 169.xxx.xxx.xxx adress.

Dhcp not allocating addresses

My network is managed by Mac Mini Server (Lion) with an Airport Extreme.
I have the wireless set up as WPA2 Enterprise with the Radius Server, Open Directory, DNS and DHCP running on my Mac Mini Server.
In the past week, possibly since the last updates were applied, all wireless devices are having real issues connecting to the network. They are authenticating OK but an address is either never assigned or appears after 5 or ten minutes. To verify this I tried to connect iPad. This was set to use DHCP and the wifi symbol appears intermittently at the top of screen but on the networks page a spinning wheel appears next to the network name and the address details (i.e local address, router, DNS, etc.) are all empty. If I configure for manually entered address details the deveice connects immediately and works fine. Switching back to DHCP and the problem comes back (i.e. connects to wifi but no address is ever allocated).
Any ideas on why DHCP would suddenly stop working. I have tried restarting the service, rebooting the Airport, rebooting the server but nothing seams to fix it. Every thing was working just fine for the past 6 months.

Thanks for reply.
Router is:
Netopia ADSL Gateway 3346N-002
4 port 10/100 Ethernet built-in
The settings in the Control Panel didn't show anything of note.
What's interesting is that when the user's laptop went back to the hotel again today, the same issue cropped again -- hotel's DHCP not giving IP Address. The office DHCP server was assigning no problem.
Then... I checked Access Connections Profiles and noticed that "Disable this wireless radio when switching to a different location" was not checked for any profiles.
I checked off on all profile and then the hotel DHCP made the connection.
I did read somewhere that a possible fix is to do an IPCONFIG/RELEASE * and then do an immediate Shutdown/Restart. Issue is that I didn't have this option on the user's laptop before I made the Access Connections fix.
Please reply to clarify or add anything -- I appreciate your quick response because I spent 4 additional hours last night.
Paul

WRVS4400N : DHCP not assigning IP addresses if WAN link is down

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