topic Re: DHCP with Multiple VLANs in Wireless

DHCP with Multiple VLANs

m-niemi — Sun, 04 Jul 2021 17:25:35 GMT

AP's -> approx. 20 AP1100 with 12.2(15)XR2 working fine (with thee vlans).

After about 8 months we bought some more 1100 AP's and the problems begun with new AP's. With one management vlan(native) and one vlan with EAP(PEAP) everything is ok. If I add one VLAN for public acces/open authen, clients are not getting IP address from dhcp for that vlan.

First two vlans have dhcp server behind router helper address, the third one has a dedicated server.

Tried with 12.3(2)JA and the problem is the same. I saw that this is not new problem here, but i begun to wonder could it possibly be hardware problem with new AP's?

Mika Niemi

Network Manager

University of Art and Design Helsinki

Re: DHCP with Multiple VLANs

dixho — Sat, 12 Feb 2005 00:26:15 GMT

12.3(2)JA certainly does not work because of bug CSCsa44872. I do not know why it does not work with 12.2(15)XR2. You probably need to open a TAC service request.

Re: DHCP with Multiple VLANs

gwcrook — Sun, 13 Feb 2005 11:33:21 GMT

I do not believe it is a hardware issue. Our AP1200's were purchased over a two year period and we have the same issue. We upgraded our ap's to XR2 and then had to downgrade to 12.2(15)JA for them to allow client to receive DHCP. I have read posts saying XR2 works and I have read posts saying XR2 does not work. Our environment uses multiple vlans and ssids with DHCP servers on different subnets. I have configured an ap with 12.2(15)JA and tested it with clients and it works, then upgraded to XR2 and the clients do not receive an IP, then downgraded to 12.2(15)JA and the clients receive an IP. We currently have 60 AP's deployed with another 70 scheduled for deployment in May 05. The latest advice from TAC was to upgrade to 12.3(2)JA2 but we have not tested it. We use PEAP and mac-authentication with the microsoft supplicant on both SP1 and SP2.

Re: DHCP with Multiple VLANs

GENE MCTIERNAN — Wed, 16 Feb 2005 17:00:21 GMT

I am having the same difficulty, and I did not see the 12.2(15)JA on the download site, do you have a source for it?

Thanks,

Gene

Re: DHCP with Multiple VLANs

GENE MCTIERNAN — Wed, 16 Feb 2005 17:05:40 GMT

Never mind, looked further down 🙂

Thanks,

Gene

Re: DHCP with Multiple VLANs

o-ziltener — Wed, 16 Mar 2005 23:09:10 GMT

From my point, software 12.3(2)JA2 does still not forward broadcast between the interfaces.

Oliver

Re: DHCP with Multiple VLANs

fernando — Thu, 17 Mar 2005 11:14:12 GMT

Well, I'm using 12 AP 1200 and all them works fine. I'm using 12.3(2)JA and the client request for a IP address sending a broadcast to the network, and the AP forward this to the Ethernet, in 8 different VLANs. I dont think it's a IOS problem.

Re: DHCP with Multiple VLANs

kevin_miller — Thu, 05 May 2005 12:10:43 GMT

It's obvious from the number of posts about this issue in the discussion forums - there is a serious problem with DHCP over wireless. Cisco has obviously not resolved it. I'm having a similar issue with 12.3(4)JA to my WLSM. I share your frustration.

Re: DHCP with Multiple VLANs

ccsmith705 — Mon, 29 Aug 2005 16:39:06 GMT

I also have ver. 12.3.(4)JA and I am experiencing the same problem. Do I understand that the only solution at this time is to downgrade to 12.3(2)JA or 12.2(15)JA to get DHCP to work with multiple vlans?

Re: DHCP with Multiple VLANs

d.beaver — Mon, 29 Aug 2005 17:56:51 GMT

I would love to hear from you once you have tested 12.3(2)JA2 to see if it is successful. I have a production network that I cannot make those kind of changes to, but would also love to upgrade to a newer version of code that works with DHCP. Thanks for doing all of the leg work as you have described above. It looks as though you are closer to solving the problem than TAC is...

I look forward to hearing more.

Re: DHCP with Multiple VLANs

kevin_miller — Mon, 29 Aug 2005 19:33:49 GMT

I've had some success recently on this. By removing the "mobility trust" statement from the tunnel interface, users are now able to get an IP consistently. This, of course, stops static IPs from working - but it is ok for my current configuration. I'm still fighting with the time it takes for clients to get and renew IPs - but that is another issue. At least it eventually works. Good Luck!

Re: DHCP with Multiple VLANs

ccsmith705 — Mon, 29 Aug 2005 21:04:39 GMT

Unfortunately I am not using a WLSM ( I assume that is what you are referring to when you said that you removed the “mobility trust” from the tunnel interface.) I upgraded to the latest IOS ver. 12.3.7.JA and that did not fix my DHCP problem. Looks like I’m going to have to downgrade!

Re: DHCP with Multiple VLANs

Ahmed Elnagar — Mon, 21 May 2007 21:38:56 GMT

Hello;

anyone find a solution for this issue???