Best way to detect and prevent DSNIFF

[aonibala]

The new CAT6500 with 720 SUP has a security feature by hard-coding the MAC and the default gateway. What other ways to detect and prevent DSNIFF?

Thanks,

Audie

[wong34539]

ARP Watch - one method to sniff on a switched network is to ARP spoof the gateway. A utility called arpwatch can be used to monitor the arp cache of a machine to see if there is duplication for a machine. If there is, it could trigger alarms and lead to detection of sniffers

[mcerha]

4.x sensors contain the ATOMIC.ARP engine which has signature to detect ARP cache poisoning type attacks used by tool like Dsniff. Keep in mind that the IDS must be on the same physical segment (or VLAN) as the attacker to detect this type of attack. See the 71xx signatures for more information.