Re: [squid-users] adjacency issues with Cisco devices and WCCP

* You want to use L2, not GRE, on the Sup720
* .. this requires L2 adjacency, and no GRE tunnel
* You also want to use Mask, not Hash assignment.

So please, please don't use GRE with a Sup720.

Adrian

On Mon, Mar 24, 2008, Ritter, Nicholas wrote:
> I am having an adjacency issue with Cisco devices, WCCP v2 and
> Linux-based squid 2.6.
>
> I am running a CentOS 5.1 box with the packaged Squid that comes with
> the ditribution. If I have a router redirecting to the squid box, and
> the squid box has a GRE tunnel setup to point to the "show ip wccp"
> advertised IP, the whole setup does not work. The moment I make the
> squid box layer2/layer3 adjacent to the "show ip wccp" advertised IP the
> whole setup works fine.
>
> I am allowing all GRE traffic, so I know it is not a firewalling issue,
> but I do notice that the linux box is not using the GRE tunnel because
> ifconfig shows no increase in packet counts.
>
> The commands I am using are as follows, and this is for WCCP/Transparent
> caching:
>
> **Note: the local ip of the squid box is 10.2.2.31, and 192.168.1.1 is
> the IP of the WCCP router. 192.168.1.1 is a Cat6506/Sup720, and
> 192.168.1.1 is a router link on that switch, 10.2.2.0/24 is a vlan with
> a router link on it, all on the same switch.
>
> /sbin/ip tunnel add gre0 mode gre remote 192.168.1.1 local 10.2.2.31 dev
> eth0
> /sbin/ip addr add 10.2.2.31/32 dev gre0
> /bin/echo 0 > /proc/sys/net/ipv4/conf/gre0/rp_filter
> /sbin/ip link set gre0 up
> /sbin/service squid start
>
>
> The WCCP router does not register the squid cache as being there, but a
> "debug ip wccp" shows the two talking to each other. This issue, in
> general, has been a problem on mulitple IOS versions, but I think it may
> be something wrong with the gre tunnel setup on the Linux box.
>
> Anyone have ideas as to what I may be doing wrong?
>
> Nick

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