We have two ASA 5510 firewalls with a tunnel between two sites. The tunnel works without issue until one of the sites experiences a brief outage due to the service provider. The VPN tunnel is not automatically establishing after the outage. It takes a restart of one of the ASA's before it will come back online. How do I get the devices to automatically try to restore the tunnel?
If you configure ISAKMP keepalives, it helps prevent sporadically dropped LAN-to-LAN or Remote Access VPN, which includes VPN clients, tunnels and the tunnels that are dropped after a period of inactivity. This feature lets the tunnel endpoint monitor the continued presence of a remote peer and report its own presence to that peer. If the peer becomes unresponsive, the endpoint removes the connection. In order for ISAKMP keepalives to work, both VPN endpoints must support them.
*Cisco PIX/ASA 7.x and later, for the tunnel group named 10.165.205.222
Thanks for your reply Collin. As it stands, the "isakmp keepalive" command is enabled by default on ASA appliances with 7.2 code. The keepalive command has not been removed from the configuration. Both devices are ASA 5510's with 7.2 software running on them.
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...