Re: %CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed for
This normally means that the packet failed authentication, meaning that something changed in the packet in transit, and the hash sent by the other side didn't match the hash calculated by this router. This could be due to a number of things:
1) Faulty router in the middle dropping bits or changing the packet in some way
2) Hardware encryption module or routers on either side having an issue.
You can try the following:
Disable hardware encryption (no crypto engine accelerator) on both sides to see if the error goes away. If yes, then the issue could most likely be the hardware module. Make sure you don't do this during peak times as software encryption may not be able to handle the traffic flowing through the tunnel.
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...