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

a.adetunji · ‎04-20-2007

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.

malgorzata.oleszak · ‎07-04-2007

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 · ‎07-04-2007

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 · ‎07-04-2007

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