Re: ICMP's & IP src addrs

Steve Deering (
18 Sep 1988 13:16-PDT

According to the draft Host Requirements RFC, a host must silently ignore
ICMP Echo and Timestamp Requests sent to an IP broadcast address. A host
may (at the implementor's discretion) reply to an Echo or Timestamp Request
sent to an IP multicast address, in which case the IP source address of
the Reply is the address of the interface on which the Request arrived.
By the routing rules in the Host Requirements RFC, that interface is also
the one over which the Reply is sent.

ICMP *error* messages (destination unreachable, redirect, source quench,
time exceeded, parameter problem) must never be sent in response to any
datagram received as a link-level broadcast or as an IP broadcast or

Steve Deering

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