Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!ucsd!ucbvax!PESCADERO.STANFORD.EDU!deering From: deering@PESCADERO.STANFORD.EDU (Steve Deering) Newsgroups: comp.protocols.tcp-ip Subject: Re: ICMP's & IP src addrs Message-ID: <88.09.18.1316.330@pescadero.stanford.edu> Date: 18 Sep 88 20:16:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 14 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 multicast. Steve Deering