I keep getting the warning message "decaps: rec'd IPSEC packet has invalid spi fro destaddr" for three routers using a site-to-site vpn. The users have complained about random lose of connectivity and this seems like the only thing that jumps out. The routers are Cisco 871's and they are connecting to a Netscreen 25 at our main office. Any advice on stablizing the VPN?
received IPSec packet specifies an SPI that does not exist in SADB. This may be a temporary condition because of slight differences in the aging of SAs between the IPSec peers or because the local SAs have been cleared. It may also be caused by invalid packets sent by the IPSec peer. This activity could be considered a hostile event.
If the local SAs have been cleared, the peer may not know. In this case, if a new connection is established from the local
router, the two peers may reestablish successfully. If the problem occurs for more than a brief period, either attempt to establish a new connection or contact the peer administrator
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...