From: Scott Morris (swm@emanon.com)
Date: Mon Aug 29 2005 - 15:26:52 GMT-3
The TAC engineer was mistaken. ICMP redirects are when a router thinks you
are going the wrong direction and is trying to help you. WCCP redirect is a
completely different beast and happens transparent to the end user. That's
actually application driven by your web-cache.
Bear in mind though that if you are using the web-cache to actually cache
pages, it does so by spoofing clients'n'server Ips. If trying to do this
through a PIX (web-cache separate from users) the PIX gets really pissed.
HTH,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Guyler, Rik
Sent: Monday, August 29, 2005 1:40 PM
To: ccielab@groupstudy.com
Subject: OT: ICMP and WCCP redirects
I have a 3030 Concentrator, PIX, and a pair of 3725 routers that reside in a
perimeter private (10.10.180.0/24) subnet. The PIX and Concentrator both
have interfaces in this subnet and interfaces in public address space. The
3725's sit between the 10.10.180.0/24 subnet and the rest of my private
network.
Addressing involved: 3725's = 10.10.180.1 (VRRP address), PIX =
10.10.180.4, Concentrator = 10.10.180.5
Remote VPN sites using 3002 hardware clients come into our network via the
Concentrator and terminate in the 10.10.180.0/24 subnet. For Internet
access from these VPN remote sites, the Concentrator sends that traffic
directly to the PIX, which bypasses Websense filtering since the traffic
never hits the 3725's running WCCP. I want to change the inside gateway on
the Concentrator to poin to the 3725's instead but I believe the 3725's will
use an ICMP redirect to allow the Concentrator to send traffic directly to
the PIX anyway, which will still bypass Websense.
I opened a case with TAC to see if I would break anything by turning off ip
redirects and the Engineer said if I do that to the 3725 interfaces that
also contain the WCCP config, it would break the WCCP redirects. However, I
don't know if I agree with that since everything I can find on "ip
redirects" seems only to involve ICMP and nothing else and as far as I know
WCCP doesn't use ICMP.
Can anybody verify whether or not this is true?
Here is the config for the interfaces on the 3725's that I want to disable
ICMP redirects:
interface FastEthernet0/0
description MB0GCR-IS-01-0/0
ip address 10.10.180.2 255.255.252.0
ip helper-address 10.10.9.90
ip wccp redirect exclude in
ip wccp web-cache redirect out
duplex auto
speed auto
vrrp 1 ip 10.10.180.1
vrrp 1 priority 200
End
Thanks,
Rik
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