On Mon, 4 Jun 2007, Vishwas Manral wrote:
By 'goes through', do you also intermediate routers which are do not
need to process the routing header in any way (i.e.: are never in
"Destination Address" field of the routing header)?
If yes, this would require punting packets from hardware forwarding to
the control processor which is IMHO a non-starter.
Having a background on ASIC design for packet forwarding, I believe
that is exactly what is done for packets that need to be processed in
some exceptional behavior. Its a very very normal case. The other case
is to process the packets in the embedded processors, using some
firmware.
Can you explain why the above design is a non-starter?
As an operator, I do not wish to buy routers that are DoS'able or
whose control processor CPU resources can be wasted on inspecting
transiting traffic. "Punting packets to the slow path" is one primary
thing that a high-speed router should not have to do. I think I'm not
alone in the operator field with this sentiment.
Oh yeah, hop-by-hop extension header should be retired as well :-)
--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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