Re: WCCP redirection IN or OUT

From: Derek Pocoroba (dpocoroba@gmail.com)
Date: Tue Jun 03 2008 - 14:11:00 ART

Luan,

Its something I have seen in the real world on clients not for the lab. If
you are really curious about it here is the link its not something you
should lose sleep over in your studies.

http://www.cisco.com/en/US/docs/app_ntwk_services/waas/acns/v52/configuration/local/guide/adtsprt.html#wp1112654

HTH

On Tue, Jun 3, 2008 at 10:01 AM, Luan Nguyen <luan@t3technology.com> wrote:

>
> Hi Derek,
>
> Could you kindly elaborate on the OUT on the client side interface fa0/0?
>
> Destination------------(fa0/1)R1(fa0/0)---------cache engine and clients.
>
> IN on fa0/0 and OUT on fa0/1 are fine. I don't get the OUT on fa0/0 part
> with the spoofing thing?
>
> Thanks.
>
> -luan
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> David Lonnie
> Sent: Tuesday, June 03, 2008 12:52 PM
> To: Derek Pocoroba
> Cc: Mike Haddad; ccielab@groupstudy.com
> Subject: Re: WCCP redirection IN or OUT
>
> Derek:
> Thanks very much.
> I suddenly see the light.
>
> On Wed, Jun 4, 2008 at 12:32 AM, Derek Pocoroba <dpocoroba@gmail.com>
> wrote:
>
> > The second diagram I listed has a "non client" so in that case the out
> > keyword would include all incoming interfaces( including this non
> client).
> > Since there is a non client you would need the extra "exclude in"
> command.
> > Or you could leave off the "exclude" and just use an ACL to filter off
> the
> > E3 network. Many different options exist.
> >
> > David,
> >
> > The direction does not actually effect where the CE sits. It just
> specifies
> > when the redirection takes place. The router will learn where the CE is
> > via
> > WCCP. In the exaple you listed you could use the "in" keyword to speed up
> > the process since it would save the router some resources. You could also
> > use "ip route-cache same-interface" but its not needed. Assuming this is
> a
> > basic lab example you are referring to. There are times where you would
> > need
> > "out" on the client side interface and the exit interface, but thats
> only
> > if you are doing things like ip spoofing. Hopefully you don't get
> something
> > like that on the lab :)
> >
> > HTH
> >
> > On Tue, Jun 3, 2008 at 9:06 AM, Mike Haddad <mike.haddad@hotmail.com>
> > wrote:
> >
> > > Thanks a lot Derek but if we set it out on the second scenario
> wouldn't
> > be
> > > enough?
> > >
> > > ------------------------------
> > > Date: Tue, 3 Jun 2008 08:33:34 -0700
> > > From: dpocoroba@gmail.com
> > > To: mike.haddad@hotmail.com
> > > Subject: Re: WCCP redirection IN or OUT
> > > CC: ccielab@groupstudy.com
> > >
> > >
> > > Mike,
> > >
> > > There was a good post a while back that explained WCCP direction. Think
> > of
> > > the redirect direction from the routers perspective.
> > > See the simple diagram below
> > >
> > > example showing the "in" direction
> > >
> > > Destination--E0--Router--E1--Client
> > > |
> > > E2
> > > |
> > > Cache Engine
> > > !
> > > interface Ethernet0/1
> > > ip address 10.10.100.6 255.255.255.0
> > > ip wccp web-cache redirect in
> > > !
> > >
> > > another one that shows how to use the "out" direction
> > >
> > > Non Client
> > > |
> > > E3
> > > |
> > > Destination--E0--Router--E1--Client
> > > |
> > > E2
> > > |
> > > Cache Engine
> > > !
> > > interface Ethernet0/0
> > > ip address 10.10.254.1 255.255.255.0
> > > ip wccp web-cache redirect out
> > > !
> > > interface Ethernet0/3
> > > ip address 10.10.100.1 255.255.255.0
> > > ip wccp redirect exclude in
> > >
> > > HTH
> > >
> > > On Mon, Jun 2, 2008 at 8:59 PM, Mike Haddad <mike.haddad@hotmail.com>
> > > wrote:
> > > >
> > > > Hello All, I am just wondering when should I put WCCP redirection
> in
> > or
> > > out.
> > > > For me it always makes sense to put the wccp redirect in on the
> > interface
> > > so
> > > > that traffic will be redirected as it enters the input queue. When
> > doing
> > > IE
> > > > labs sometimes they apply it in and sometimes out. I appreciate if
> > > somebody
> > > > can clarify this, Regards,
> > > > _________________________________________________________________
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> > > >
> _______________________________________________________________________
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> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Derek Pocoroba
> > > CCIE #18559
> > >
> > >
> > > ------------------------------
> > >
> >
> >
> >
> > --
> > Derek Pocoroba
> > CCIE #18559
> >
> >
> > _______________________________________________________________________
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>
>
> _______________________________________________________________________
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> 

-- 
Derek Pocoroba
CCIE #18559

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