Wireless Router as DHCP server

Unanswered Question
Nov 10th, 2008


I am using cisco 1812W router with IOS c181x-advipservicesk9-mz.124-15.T7.bin.

I am running this router as a DHCP server with pool of / 24. The wireless users connecting to this router gets authenticated by ACS.Once authenticated, they will get IP from router.

The issue that I am facing is, sometimes my laptop gets an IP address from the range of 192.168.0.x/ 24 with GW This IP range is not present in my network.

I have also tried explicitly excluding this range by command "ip dhcp excluded range", but it does not help.

Can any one guide me on this.....

I have this problem too.
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krishanmistry Mon, 11/10/2008 - 22:14

Sounds like you have another DHCP server on the same network, it may be a rogue device.

You may have tried this already but check on the client where its getting its DHCP address from using 'ipconfig/all'

Also I would check the DHCP leases on the 1812 router.

Hope this helps

pprajakta Tue, 11/11/2008 - 03:37

No..There is no other DHCP server present in network. DHCp lease period is 8 days.I m attaching the output of IPconfig...

krishanmistry Tue, 11/11/2008 - 04:31

Has this router been deployed else where previously, check the startup config, If all else fails copy the config, wipe the box completely and then reconfigure the router.


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