AW: [e2e] Question about fast path / slow path and IPv6

RJ Atkinson rja at
Sun Aug 31 13:31:34 PDT 2003

On Saturday, Aug 30, 2003, at 18:25 America/Montreal, Michael Welzl 

> Hi Ran,
> Thanks for your answer! I figure I was too imprecise ...
> what I meant was:
>> Other products cannot do so -- in which case only packets without
>> options are "fast path" and packets with options are "slow path".
>> This last case includes all (or nearly all) routers that use
>> CPU-based packet forwarding.
> ... in these cases, does it make a difference if I use
> IPv4 or IPv6?

It depends.  Some folks do both IPv4 and IPV6 in software.  Some
do IPv4 in hardware and IPv6 in software.  Some folks forward
both using hardware.  It just varies.


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