Block DHCP responding from fake DHCP-SERVER ?

rico_hao40 · ‎04-01-2009

On my local network I have a Linux server provide DHCP services. Recently I had issues with fake DHCP offering from some PCs (either infected by virus or unauthorized DHCP services running). Is anyway I can block all DHCP offering responding and only allow the real one?

Or, beacuse my DHCP server attached to a certain port, can I force DHCP request to that port rather than broadcast ?

Thanks

John Blakley · ‎04-01-2009

Rico,

Do you have a Cisco switch that your Linux server connects to? If so, you can enable dhcp snooping and trust the port that your Linux server is connected to.

HTH,

John

HTH, John *** Please rate all useful posts ***

rico_hao40 · ‎04-01-2009

thanks for your quick reply. I will try it.