topic Re: Wireless Router as DHCP server in Wireless

Wireless Router as DHCP server

pprajakta — Sat, 03 Jul 2021 23:45:29 GMT

HI,

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 10.0.0.0 / 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 192.168.0.1. 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.....

Re: Wireless Router as DHCP server

krishanmistry — Tue, 11 Nov 2008 06:14:12 GMT

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

Re: Wireless Router as DHCP server

pprajakta — Tue, 11 Nov 2008 11:37:19 GMT

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

Re: Wireless Router as DHCP server

krishanmistry — Tue, 11 Nov 2008 12:31:38 GMT

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.

Re: Wireless Router as DHCP server

pprajakta — Wed, 12 Nov 2008 05:23:15 GMT

We have freshly installed this router.