[21616] in North American Network Operators' Group
Re: Cache-as-cache-can
daemon@ATHENA.MIT.EDU (steven hessing)
Tue Nov 17 11:57:42 1998
To: Katsuhiro Kondou <kondou@nec.co.jp>
cc: nanog@merit.edu
In-reply-to: Your message of "Tue, 17 Nov 1998 19:36:34 +0900."
<19981117193634Y.kondou@inn.do.mms.mt.nec.co.jp>
Date: Tue, 17 Nov 1998 13:00:16 +0100
From: steven hessing <stevenh@inet.unisource.nl>
There seem to be three solutions for transparent web-caching:
1 a web-cache between two routers, all traffic is routed through it.
2 a l4 switch between two routers, all traffic is routed through it.
The l4 switch redirects web-requests to a www-cache.
3 a web-cache connected to a router which uses policy routing to
direct web-requests to it.
1 is extremely ugly and impossible at high traffic levels
2 is an extra device in your network which needs to be managed
and is often difficult to implement in a WAN environment (our
core routers don't have (fast-)ethernet interfaces.)
3 is the preferred solution but you need to run 11.3 or 12.0 for
it. These software versions support fast-switched policy routing.
Most ISPs currently rely on 11.1CC features and thus can not upgrade
to 11.3. The wait is thus for a stable release of 12.0.
-- Steven
In your mail from 17-11-1998 you write:
> In article <19981117091400.D9778@skriver.dk>,
> Jesper Skriver <jesper@skriver.dk> wrote;
>
> } Why use things like this, use a default route to a HSRP address ...
>
> That could be. But they (appliance venders) haven't shown
> it at this point, afaik. They simply shows a veiw of cache
> appliance and l4 switch sitting between 2 routers. Why?
> --
> Katsuhiro Kondou
