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
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.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...