Clients not getting IP address from DHCP server through Tunnel interface.

Unanswered Question
Apr 20th, 2007
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Could someone help me with this:

APs were able to get registered by WLSM but client can't get IP Adrresses from DHCP server through Tunnel interface on Sup 720. IP helper configured on Tunnel Interface.

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Overall Rating: 4 (1 ratings)
malgorzata.oleszak Wed, 07/04/2007 - 00:18
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I've got the same problem. I established 2 tunnels, one of them works fine, the second - I experinced the same problem with dhcp - clients can't get ip address through dhcp server located on switch or even helper address. Did you find any solution?

m_adetunji Wed, 07/04/2007 - 17:32
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I was able to solve it in the end. I had an ACL on Core Switch blocking traffic from AP to/fro WLAN/WLSM Switch. The initial traffic goes through the AP's and access switch (authentication and broadcast) to WLAN/WLSM switch through Core, thereby blocking layer 3 traffic and not layer 2 (authentication).

You might need to check your radio on your client (a = 5. Ghz or b/g = 2.4Ghz) to see that it corresponds to what is configured on the AP.

dancampb Wed, 07/04/2007 - 09:36
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  • Cisco Employee,

What often causes this issue is that the sup720 is missing the config "no ip dhcp snooping information option" in the global config.


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