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TTL decremening (was Re: My personal take on cell switching routers)

  • From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
  • Date: Mon, 3 Jun 96 14:36:17 JST
  • Cc: gja@bellcore.com, malis@nexen.com, ion@nexen.com, gja@thumper.bellcore.com

Frank;

> Tools like Traceroute and multicast-scoping implicitly rely on specifc
> TTLs and actions to occur based on those TTLs.

Thank you very much for pointing out that NHRP is incapable of
Traceroute and multicast-scoping.

With CSRs, traceroute and QoS-less multicast-scoping simply works.

And, with RSVPed multicast, TTL of PATH message can control the
scope.

> TCP has some reliance on the upper-bound of the lifetime of packets.
> Part of this is time-based (i.e. in 791 someplace it says decrement
> 1/second while in queues and 1/hop). If TTL isn't decremented
> properly it may be remotely possible that a TCP connection could get
> "weird".

Agreed. But, unless you are thinking of interplanetary
communication, QoSed flow won't delay so much.

							Masataka Ohta