I have a VPN Tunnel between a PIX 515E (6.3) and an ASA 5510 (7.1). The tunnel went down recently, and removing one of two crypto map statements that was going to the same destination and rebuilding the tunnel brought it back up. However, on the PIX debug isakmp still shows the following:
ISAKMP (0): processing NOTIFY payload 36136 protocol 1
spi 0, message ID = 1312318556
ISAMKP (0): received DPD_R_U_THERE from peer 255.255.255.255
ISAKMP (0): sending NOTIFY message 36137 protocol 1
return status is IKMP_NO_ERR_NO_TRANS
crypto_isakmp_process_block:src:255.255.255.255, dest:255.255.255.254 spt:500 dpt:500
What does this mean, typically? Also, can one determine if this tunnel will fail again? We have two other site to site VPN tunnels on the PIX, and neither of the other two devices generate these messages. I'll send configs, if necessary.