DHCP ATTACK

[sheraz butt]

Hi All,

      I am having issue in my network 4500CORE switch with vlans and dhcp-server------>2900 access switches.

someone connect linksys router in one of access switch in the network and it act like dhcp server clients gets wrong ip address any fix to this.

Regards 

[johnd2310]

Hi,

You should look at enabling dhcp snooping, arp inspection and port security on your network. Have a look at the following docs:

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swdynarp.html

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swdhcp82.html

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swtrafc.html

Thanks

John