Connected: An Internet Encyclopedia
RFC 1812 - 4.3.2.4 ICMP Message Source Address
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4.3.2.4 ICMP Message Source Address

Except where this document specifies otherwise, the IP source address in an ICMP message originated by the router MUST be one of the IP addresses associated with the physical interface over which the ICMP message is transmitted. If the interface has no IP addresses associated with it, the router's router-id (see Section [5.2.5]) is used instead.


Next: 4.3.2.5 TOS and Precedence

Connected: An Internet Encyclopedia
RFC 1812 - 4.3.2.4 ICMP Message Source Address