rfc 1812 third party address on traceroute
octalnanog at alvarezp.org
Tue May 31 16:08:42 UTC 2016
On 05/30/2016 10:03 PM, Randy Bush wrote:
> rfc1812 says
> 184.108.40.206 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.
> some folk have interpreted this to mean that, if a router R has three
> | |
> | B |--------- D
> S ---------| A R |
> | C |--------- (toward S)
> | |
> of course, simpletons such as i would desire the source of the time
> exceeded message to be A. after all, this is the interface to which i
> sent the icmp with the TTL to expire.
Do you mean the source address or the source interface?
I'm not sure if you mean that, if sent through C it should have the
source addres of A, or that it should actually be sent through A
regardless of the routing table (which sounds better to me).
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