Re: ping/record route for 4.3BSD Unix wanted


J. Noel Chiappa (JNC@XX.LCS.MIT.EDU)
Wed 26 Mar 86 13:41:48-EST


        Record route isn't the best tool. If a gateway decides to use
as a next hop a machine which is dead, then the Ping packet will
disappear into a black hole. A much better tool is an ICMP packet
containing as data an address, which, when sent to a gateway, causes
the gateway to return information about the next hop that it would use
to route the packet, i.e. the address that it would send the packet
out to, etc. It's quite easy to build a tool which uses this to find
out what route a packet would take. This is one more of the 'extended
ICMP' messages I'm trying to get added to the ICMP spec.

        NOel
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