I have a mysterious problem with my DMVPN configuration. I have one hub (Cisco 1721 with IOS 12.2(13)T5) and two spokes (Cisco 1760 router also with IOS 12.2.(13)T5 ). Everything works fine until a moment when the tunnel interface (mGRE) of the hub drops the packets(Input queue: 76/75/1158/0 (size/max/drops/flushes); Total output drops: 0). The results are lost of connectivity and no NHRP updates. The SAs of Isakmp and IPSec are OK.
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...