Clients cannot obtain IP via wireless network(WLC) when dhcp snooping is enabled on switches

 

When your clients cannot obtain IP via wifi managed by Wireless Controller and you know DHCP SNOOPING is enabled on switches do the following:

 

  • check logs on switch where WLC is connected.

014938: Apr 23 09:11:09: %DHCP_SNOOPING-5-DHCP_SNOOPING_NONZERO_GIADDR: DHCP_SNOOPING drop message with non-zero giaddr or option82 value on untrusted port, message type: DHCPDISCOVER, MAC sa: 001e.f732.aca7

  • if you see logs like above login to WLC and reconfigure it

ip_dhcp_snooping-1.png

Enable DHCP proxy should be DISABLED so option 82 will not be added to dhcp packets

 

dzbanek 2013-04-23

 

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