Does anyone have any experience or further explanation of the above/below message other than the system message documentation. I have seen this message being returned with the PIXs inside IP and the MAC address of a server. The server does not have the same IP address as the PIX, but does this mean that the PIX thinks it does?
%PIX-4-405001: Received ARP response collision from 10.0.6.1/000b.xxxx.xxxx on interface inside
(where 10.0.6.1 is the ip address on the pix inside interface and 000b.xxxx.xxxx is the MAC address from a Server).
Re: %PIX-4-405001: Received ARP response collision
This message just means that we received an ARP request from the a machine with the MAC address of 000b.xxxx.xxxx claiming that he was 10.0.6.1. The PIX barks about this because we know that we are 10.0.6.1 and our MAC address differs from 000b.xxxx.xxxx. I have no idea why your server might be doing this. Is there anything odd loaded on this server? Perhaps some sort of sniffing tool? Has this maching been compromised in some way and is trying to fool the internal network into thinking that he is actually the default gateway for the network? Just a few thooughts but you may want to do some investigating on this.
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...