Re: [RRG] Six/One Router Design Clarifications

[Christian Vogt <christian.vogt@nomadiclab.com>]

On Jul 23, 2008, Drake, John E wrote:

> > Talking about performance:  An ACL that can limit its looks to
> > a single place in the IP header (i.e., with translation) can
> > likely be more efficient that an ACL that needs to look into
> > an inner IP header behind a pair of LISP and UDP headers.
>
> JD:  In any map & encap scheme, won't a transit space router have to
> deal with a multiplicity of packet formats (e.g., both encapsulated  
> and
> non-encapsulated packets) and won't it be a performance hit to figure
> out a packet's format and then look for the correct fields within it?

Yep, exactly.

And you avoid this performance hit with translation-based schemes, where
it is always sufficient to look at the addresses in the IP header.

- Christian



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