Connected: An Internet Encyclopedia
4.3.2.4 ICMP Message Source Address
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4. INTERNET LAYER - PROTOCOLS
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4.3 INTERNET CONTROL MESSAGE PROTOCOL - ICMP
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4.3.2 GENERAL ISSUES
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4.3.2.4 ICMP Message Source Address
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.
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Connected: An Internet Encyclopedia
4.3.2.4 ICMP Message Source Address