We have enabled an IOS based IPS on our internet routers and all seems to be working well apart from a strage issue. We are currently only alerting on all signitures so no traffic should be droppped. The problem i have is with incoming hotmail and yahoo mail messages which fail to be delivered to the recipents on our mail server. When we disable the IPS the mails soon arrives after.
I have applied the IPS inbound on the internet faceing interface. Can anyone shed some light as to why we have this issue.
our router version is c7301-advipservicesk9-mz.124-9.T.bin.
Not sure where to find the IPS version. I have completed further testing on this issue. When i have enabled the IPS on inbound and outbound traffic i cannot receive hotmail emails and i am unable to access the hotmail website.
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...