Re: [squid-users] wccp router configuration

There was a discussion between Henrik and I about this subject about two
months ago on this list.

I think Henrik's reasoning was pretty much right-on, which is that the
WCCP ID of 0x883 is not defined in the GRE specification, and so to be
GRE compliant the module must drop the packets. The patch allows it to
accept an 0x883 packet and treat it like a standard 0x880 packet
(because they are both standard GRE encapsulated). If the patch were
standard, the GRE module would stop being GRE to the specification.
Wierd, but that's the way things are.

I don't know if sending a patch to the GRE maintainer would lead to it's
eventual inclusion or not. The patch would probably need to be cleaned
up a bit, and possibly made optional in the kernel configuration (i.e.
add a "WCCP packets are accepted by GRE module" option that would ifdef
out the patch if the user wanted strict GRE). It isn't difficult to do,
but I've never really had a strong urge to get it into the official
kernel--the gre module changes so infrequently, it doesn't take much
work to keep the patch in good working order.

Tom Hutchison wrote:
> Is there a reason the patch for ip_gre has not been made a permanent
> "fix" in the kernel source tree?
>
> Tom
>
>
> Joe Cooper wrote:
>
>> You've followed the FAQ instructions for policy routing
>> redirection--not WCCP. Try again with the section on WCCP, taking
>> careful note of the need for a custom module (ip_wccp or a patch for
>> ip_gre in Linux, for example) to decapsulate the WCCP packets.
>>
>> With WCCP, there is no further configuration needed in the router to
>> add another box. You simply configure the new Squid to talk to the
>> router with the WCCP directives.
>>
>> Jack wrote:
>>
>>> Hello All,
>>> I am new to Cisco WCCP
>>> Anybody How is using wccp help me to configure in router
>>>
>>> I have configured Cisco router as given in FAQ but it does not work.
>>> Where i did wrong?
>>> If i want to add one more squid box with ip 192.168.1.4 how to add
>>> it in
>>> router configuration.
>>>
>>> !
>>> route-map proxy-redirect permit 110
>>> match ip address 110
>>> set ip next-hop 192.168.1.3
>>> !
>>>
>>> access-list 110 deny tcp any any neq www
>>> access-list 110 deny tcp host 192.168.1.3 any
>>> access-list 110 permit tcp any any
>>>
>>> Thanks,
>>> Jack
>>
>>
>>
>
>

-- 
Joe Cooper <joe@swelltech.com>
http://www.swelltech.com
Web Caching Appliances and Support