From: William Chen (kwchen@netvigator.com)
Date: Fri Mar 19 2004 - 11:11:18 GMT-3
Hi Scott,
Thanks, I think I understand the case.
I think Web-cache is mainly used for improve the reponse when client
access the web server. It is rare to have a cache engine to be located at
the same network as the web server, but still it is a valid case.
Thanks a lot.
Best Regards,
William Chen
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'William Chen'" <kwchen@netvigator.com>; <ihatecisco@att.net>; "'Ng,
Kim Seng David (David)'" <ksng@avaya.com>; <ccielab@groupstudy.com>
Sent: Friday, March 19, 2004 9:55 PM
Subject: RE: Confirmation on my understanding of WCCP
> Again, it's a perspective thing.
>
> Typically, we think of working for clients. From that, the web requests
> come IN from our local LANs and go OUT towards the Internet.
>
> For local server caching stuff, we look the opposite direction. The only
> times web requests will come IN from our Internet-connected interface is
if
> they are looking for our local web servers.
>
> So the same principles apply. Pick the Internet-connected interface, use
> the redirect "in" command and that will provide caching support for your
> local web servers.
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
> JNCIS, et al.
> IPExpert CCIE Program Manager
> IPExpert Sr. Technical Instructor
> swm@emanon.com/smorris@ipexpert.net
> http://www.ipexpert.net
>
>
>
> -----Original Message-----
> From: William Chen [mailto:kwchen@netvigator.com]
> Sent: Friday, March 19, 2004 8:49 AM
> To: swm@emanon.com; ihatecisco@att.net; 'Ng, Kim Seng David (David)';
> ccielab@groupstudy.com
> Subject: Re: Confirmation on my understanding of WCCP
>
> Dear Scott,
>
> Can you say more about how the "caching for your won servers" be done
by
> WCCP?
>
> Thanks a lot.
>
> Best Regards,
> William Chen
> ----- Original Message -----
> From: "Scott Morris" <swm@emanon.com>
> To: "'William Chen'" <kwchen@netvigator.com>; <ihatecisco@att.net>; "'Ng,
> Kim Seng David (David)'" <ksng@avaya.com>; <ccielab@groupstudy.com>
> Sent: Friday, March 19, 2004 9:46 PM
> Subject: RE: Confirmation on my understanding of WCCP
>
>
> > The "in" or "out" is from the perspective of the router. Requests will
> > either be inbound to an interface or outbound towards someplace else.
> >
> > Your reality may be caching for your own servers, or for client
> requests....
> > Has nothing to do with the commands though. Just the routers'
> perspective.
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
CISSP,
> > JNCIS, et al.
> > IPExpert CCIE Program Manager
> > IPExpert Sr. Technical Instructor
> > swm@emanon.com/smorris@ipexpert.net
> > http://www.ipexpert.net
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > William Chen
> > Sent: Friday, March 19, 2004 8:02 AM
> > To: ihatecisco@att.net; Ng, Kim Seng David (David);
ccielab@groupstudy.com
> > Subject: Re: Confirmation on my understanding of WCCP
> >
> > Hi,
> >
> > Sorry, I don't understand what is the different you mean by Client
side
> > web caching and Server side web caching.
> >
> > I think WCCP is always: Client --> Cache Engineer ---> Web Servers.
> >
> > "In" means inbound traffic will be checked for redirection, and "Out"
> > means outbound traffic will be checked for redirection.
> >
> > Am I misunderstand?
> >
> > Best Regards,
> > William Chen
> >
> > >
> > > The Out would be used for redirecting outbound requests to the
internet.
> > > {Client side web caching}
> > >
> > > The In would be used for redirecting inbound requests from the
> > > internet {server side web caching.}
> > >
> > > ip wccp <service> redirect
> > > To enable packet redirection on an outbound or inbound interface using
> > > Web Cache Communication Protocol (WCCP), use the ip wccp service
> > > redirect interface configuration command. To disable WCCP redirection,
> > > use the no form of this command.
> > >
> > > ip wccp service redirect {out | in}
> > > no ip wccp service redirect {out | in} Syntax Description
> > >
> > > service
> > > Specifies the service group. You can specify the web-cache
> > > keyword, or you can specify the identification number(from 0 to 99) of
> > > the service.
> > >
> > > redirect
> > > Enables packet redirection checking on an outbound or
> > > inbound interface.
> > >
> > > out
> > > Specifies packet redirection on an outbound interface.
> > >
> > > in
> > > Specifies packet redirection on an inbound interface.
> > >
> > >
> > >
> > >
> > > ***A small point to note
> > > Its a good idea to make sure that you check all commands to see if
> > > they
> > need
> > > a special command to be enabled before assuming they are configured.
> > >
> > > I know some features like mls qos, WRED & Switches-Port Security can
> > > burn you if you aren't paying attention, and forget to enable them.
> > >
> > > ----- Original Message -----
> > > From: "Ng, Kim Seng David (David)" <ksng@avaya.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Friday, March 19, 2004 5:27 AM
> > > Subject: Confirmation on my understanding of WCCP
> > >
> > >
> > > > Hello group,
> > > >
> > > > I just would like to confirm my understanding on the "ip wccp
> > > > redirect
> > > OUT" command. Gone through the grpstudy archives, doc cd and cisco.com
> > > but just to make sure I get it right. I had no problems understanding
> > > the
> > other
> > > "redirect in" cmd though. Anyway, I have taken the following config
> > example
> > > from doc CD:
> > > >
> > > > "Running a Web Cache Service Example The following example shows a
> > > > web cache service configuration session:
> > > >
> > > > router# configure terminal
> > > > router(config)# ip wccp web-cache
> > > > router(config)# interface ethernet 0 router(config-if)# ip wccp
> > > > web-cache redirect out "
> > > >
> > > > My understanding from the above config is that any http request
> > > > outgoing
> > > from interface e0 will be re-directed to some other interfaces where
> > > the web-cache is residing. Interface e0 would likely be a connection
> > > to the internet or where a web server is located. Interface e0 will
> > > not be where the web-cache is located.
> > > >
> > > > Is my understanding correct?
> > > >
> > > > Thanks in advance
> > > > David
> > > >
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