Re: WCCP - cache only , no proxy

The problem is that a single squid cache can only communicate with one router
since its stuck in WCCP V1. It would be nice if Cisco gave a license for V2 to
the squid developers!

Lincoln Dale wrote:

> At 01:06 20/04/00, fooler wrote:
> >if i understand you correctly what you mean here, to avoid ip
> >fragmentation in a
> >transparent environment, im using a cisco switch using _store_and_forward_ in
> >switching mode to solve this problem.
>
> it is less of an issue on (say) a L2 ethernet switch, given there's no
> reason to fragment at layer-2.
> (when did you last use an ethernet switch that forced you to a MTU of 576
> bytes? :-) )
>
> the issue is more one of (say) dial-up users whose IP stacks have set a MTU
> of 576 on a dial connection.
>
> the absolute 'recommended' configuration would be to run WCCP on that
> access-edge.
>
> ie.
> a typical PoP would look something like this:
>
> ...............
> : core router :
> :.............:
> | (switched {fast}ethernet)
> -------------------------------------------------------
> | (fastethernet) | |
> .................... ................. ....................
> :dial access-server: :DSL aggregation: ... :cable/wireless agg:
> :..................: :...............: :..................:
> | (ppp) | | | (atm) | | | (ppp) | |
> | | | | | | | | |
> dial dial isdn DSL DSL DSL HFC wireless
> user user user user user user user users
>
> our recommendation would be to _always_ run WCCP on the access-servers
> themselves (dial, DSL, cable, leased-line, ...) -- and thus any
> 'fragmentation' is limited to the per-hop link between the customer and the
> interception/redirection point.
>
> any potential IP fragmentation issues will be taken care of automatically,
> since TCP MSS negotiation will be taking into account the path MTU.
>
> of course, there is still the potential for problems if those end-users are
> actually a network, and are using a lower MTU in their own network cloud,
> but i'm yet to see a 'problem' case yet.
>
> cheers,
>
> lincoln.
>
> --
> Lincoln Dale Content Switching
> ltd@cisco.com Cisco Systems Inc. | |
> || ||
> +1 (408) 525-1274 bldg G, 170 West Tasman |||| ||||
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Received on Sat Apr 22 2000 - 12:39:31 MDT