Re: [squid-users] How does WCCP work ?

Hi
  I configured a Linux server for WCCP.. The router finds the proxy server
automatically.. and also redirects some of the packets. But the browsing
is too slow; so slow that it is better not to have WCCP enable.

  May I know where sth went wrong ?

On Sat, 17 Mar 2001, Joe Cooper wrote:

> Ok...Let's see if the problem can be isolated:
>
> What is your IOS version?
>
> If a version that supports both v1 and v2 of WCCP, have you switched it
> to v1?
>
> I know that you are able to load the ip_wccp module, because we've
> already discussed that. Have you set up a network dump, using a tool
> such as tcpdump or ethereal, between the router and the Squid box to see
> if the Squid is actually sending out HERE_I_AM messages?
>
> To answer your questions:
>
> For a complete description of the protocol, here is the specification
> for v1:
>
> http://www.wrec.org/Drafts/draft-ietf-wrec-web-pro-00.txt
>
> Short version:
>
> The protocol is pretty simple. Squid sends a packet to the router:
> "HERE_I_AM" on the WCCP port (2048), which contains the IP of the
> sending cache. The router sends a packet back, with an ID: "I_SEE_YOU".
> When the cache replies: "HERE_I_AM" again, it confirms two way
> connectivity by including the ID from the previous "I_SEE_YOU".
>
> There is no "WCCP channel", just port 2048, but those packets are not
> encapsulated. So, even without the ip_wccp module loaded, I think you
> will still be able to 'connect' the cache and the router, and see
> HERE_I_AM and I_SEE_YOU packets going back and forth. Redirected
> requests, however, will not work until one of the GRE modules is loaded.
>
> If you are not seeing this communication, then either your Squid is
> sending the WCCP messages, the messages are not reaching the router, or
> the router is ignoring them. You need to do some form of packet dump to
> see if those messages are coming and going at all.
>
> Awie wrote:
>
> > Folks,
> >
> > I am beginning frustrated because not able to make WCCP running at our
> > Squid system.
> >
> > My Squid is known by Cisco as CacheEngine. But redirection progress was
> > not happen. I did not see "Here_I_AM / I_See_You" signal in my router
> > although I am in debug and terminal mode.
> >
> > I followed all of FAQ instruction and suggestion from some of you
> > (thanks for Joe Cooper, Jan Haluza, etc), PLUS Cisco staff. However, my
> > WCCP is still not running.
> >
> > Hope someone would explain me how actually Squid communicate with router
> > through WCCP channel.
> >
> > Please advise.
> >
> > Thx & rgds,
> >
> > Awie
>
> --
> Joe Cooper <joe@swelltech.com>
> Affordable Web Caching Proxy Appliances
> http://www.swelltech.com
>
>
Received on Tue Mar 20 2001 - 00:27:31 MST