I have a problem setting up GRE tunnel ( w/o any encryption) between Cisco 2611 and 2621. IOS version is the same c2600-ik9o3s3-mz.123-26.bin.
The problem is that after configuring both devices I can not ping 2611 from 2621 over tunnel. I added a rule on 2611 WAN interface, so I could see incoming GRE packets. During the ping process I do NOT see any matches on this rule. But as soon as I ping 2621 from 2611, 2621 can ping 2611 as well and I see matches on this rule.
The same thing happens with IPSEC tunnel, but first I would like to resolve issue with GRE as I think the have the same roots.
Can you please advice how I can resolve this issue ?
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...