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

On Thu, 22 Mar 2001, Awie wrote:

> Jorge,
>
> Many thanks for your follow up about this issue.
>
> I heard (read) that kernel 2.4.x is still not good enough for production

depends. test your combination of stuff and see if it works... I've got
2.4 machines with uptimes in excess of a month. some drivers are actually
pretty crazy... but if you're debugging usb or trying to make your
soundcard work you can afford to be selective.

joelja

> machine. However, I will try it (your ip_wccp.c) in our trial machine.
>
> Thx & rgds,
>
> Awie
>
> ----- Original Message -----
> From: "Jorge Boncompte [DTI2]" <jorge@dti2.net>
> To: "Binaya" <binaya@mos.com.np>; "Joe Cooper" <joe@swelltech.com>
> Cc: "Awie" <awie@eksadata.com>; <squid-users@squid-cache.org>
> Sent: Thursday, March 22, 2001 4:34 AM
> Subject: Re: [squid-users] How does WCCP work ?
>
>
> > I have a working setup now. In a couple of days i'll send a modified
> > version of ip_wccp.c for 2.4.x
> >
> > Regards.
> >
> > -Jorge
> >
> > ==============================================================
> > Jorge Boncompte - Técnico de sistemas
> > DTI2 - Desarrollo de la Tecnología de las Comunicaciones
> > --------------------------------------------------------------
> > C/ Abogado Enriquez Barrios, 5 14004 CORDOBA (SPAIN)
> > Tlf: +34 957 761395 / FAX: +34 957 450380
> > --------------------------------------------------------------
> > jorge@dti2.net _-_-_-_-_-_-_-_-_-_-_-_-_-_ http://www.dti2.net
> > ==============================================================
> > Without wicker a basket cannot be done.
> > ==============================================================
> >
> > ----- Original Message -----
> > From: "Binaya" <binaya@mos.com.np>
> > To: "Joe Cooper" <joe@swelltech.com>
> > Cc: "Awie" <awie@eksadata.com>; <squid-users@squid-cache.org>
> > Sent: Tuesday, March 20, 2001 8:26 AM
> > Subject: 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
> > > >
> > > >
> > >
> > >
> >
>

-- 
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Joel Jaeggli				       joelja@darkwing.uoregon.edu
Academic User Services			     consult@gladstone.uoregon.edu
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