On 6/20/2016 7:52 AM, Templin, Fred L wrote: > Hi Joe, > >> -----Original Message----- >> From: Joe Touch [mailto:[email protected]] >> Sent: Friday, June 17, 2016 2:47 PM >> To: Templin, Fred L <[email protected]>; Vincent Roca >> <[email protected]> >> Cc: [email protected]; [email protected] >> Subject: Re: [Int-area] Comments for draft-ietf-intarea-tunnels-02 >> >> ... >> (yes, I'd be even happier if all networks periodically tested the >> minimum MTU as part of operations monitoring) > The problem is that the ingress is not the source of the original packets; > it is only the source of the tunneled packets. And, the ingress may need > to encapsulate packets coming from many original sources that may have > many different flow label and/or TOS values. Therefore, there is no way > for the ingress to ensure that any probes it sends will travel over the > same paths that ordinary data packets will travel due to multipath.
For the benefit of others, Fred and I have discussed this before. My position is that a network path is determined by network header reachability. Fred - your point is correct, but it also means that there is absolutely no packet that can be used a probe for any other packet unless they are identical in headers, content, and length. If your network "path" is susceptible to that, then maybe it really should behave unexpectedly. Joe _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
