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how to stop getting dchp from outside

Posted: Thu Feb 24, 2011 9:41 am
by Myron
guys i found this problem happen this morning my vlan3 hotspot dhcp network is but the problem is some of mac user getting i think this is from outside or someone plug a router in my network if i trace this show 6 hops, and if i ping its reachable. i have also in my vlan1 but i disable to isolate the problem and i found out this another .1.1 dchp please how can i stop this guys?

C:\Documents and Settings\ChefAccountant>ping

Pinging with 32 bytes of data:

Reply from bytes=32 time=412ms TTL=251
Reply from bytes=32 time=476ms TTL=251
Reply from bytes=32 time=363ms TTL=251
Reply from bytes=32 time=188ms TTL=251

C:\Documents and Settings\ChefAccountant>tracert

Tracing route to over a maximum of 30 hops

1 <1 ms <1 ms <1 ms
2 143 ms 138 ms 61 ms []
3 151 ms * 201 ms []
4 141 ms 160 ms 42 ms []
5 * * * Request timed out.
6 77 ms 62 ms 55 ms

Re: how to stop getting dchp from outside

Posted: Sat Feb 26, 2011 3:10 pm
by dmcmahan
Create a new dhcp network and pool using a different scope then change the dhcp lease time to expire on the old pool. Someone has installed a router and they are plugged into the wrong port and sending out IPs from there location. Happens all the time.