I am not sure why this packet is not allowed back in; I do not have any access-list in place on the PIX. PIX is supposed to by default allow connections from Higher Security interface to Lower Security interface...
Kindly explain more regarding your setup, with sample ip addresses.( inside address, outside address, switch, router details ...etc).
The PIX firewall doesn't allow/support ICMP redirect messages.
From where are you intiating the ping?
Provide complete details to help you out.
Basically You need to check the routing table entries, in your switch, pix and in the router and ensure that it is all properly configured and ensure that you are not running in to a situation which can cause ICMP redirects in your network to avoid this problem.
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...