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

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
Received on Mon Mar 24 2008 - 13:41:36 MDT