| Message Code | PIX-6-602104 |
| Severity | Information |
| Description | IPSEC: Received an ICMP Destination Unreachable from src_addr, PMTU is unchanged because suggested PMTU of rcvd_mtu is equal to or greater than the current PMTU of curr_mtu, for SA with peer peer_addr, SPI spi, tunnel name username. src_addr—IP address of the PMTU sender rcvd_mtu—Suggested MTU received in the PMTU message curr_mtu—Current MTU associated with the IPSec tunnel peer_addr—IP address of the IPSec peer spi—IPSec Security Parameters Index username—Username associated with the IPSec tunnel . |
| Explanation | This message occurs when an ICMP message is received indicating that a packet sent over an IPSec tunnel exceeded the path MTU and the suggested MTU is greater than or equal to the current MTU. Because the MTU value is already correct, no MTU adjustment is made. This may happen when multiple PMTU messages are received from different intermediate stations and the MTU is adjusted before the current PMTU message is processed. |
| User Action | No action required. |
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