| Message Code | PIX-4-402118 |
| Severity | Warning |
| Description | "IPSEC: Received an protocol packet (SPI=spi, sequence number seq_num) from remote_IP (username) to local_IP containing an illegal IP fragment of length frag_len with offset frag_offset." |
| Explanation | "This message is displayed when a decapsulatd IPSec packet contains an IP fragment with an offset less than or equal to 128 bytes. The latest version of the Security Architecture for IP RFC recommends 128 bytes as the minimum IP fragment offset to prevent reassembly attacks. This
may be part of an attack. This message is rate limited to no more than one message every five seconds. protocol—IPSec protocol spi—IPSec Security Parameters Index seq_num—IPSec sequence number remote_IP—IP address of the remote endpoint of the tunnel username—Username associated with the IPSec tunnel local_IP—IP address of the local endpoint of the tunnel frag_len—IP fragment length frag_offset—IP fragment offset in bytes" |
| User Action | Contact the administrator of the remote peer to compare policy settings. |
| Reference Links |
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