Set Up Squid Siblings On CentOS 6.3 With WCCP

This tutorial will walk you through setting up a couple of outbound Squid proxy sibling servers running on CentOS 6.3 and have them connected to your gateway using WCCP. This will not cover the tuning of Squid in terms of cache performance.


1. Prerequisites

You have a Cisco gateway that supports WCCP.


2. Preliminary notes

  • The dns domain in this will be
  • Server 1 is named with an IP of
  • Server 2 is named with an IP of
  • Local DNS with an address of
  • The Gateway address is
  • The install media used is CentOS 6.3 minimal

3. CentOS setup

First off we need to install CentOS to both servers. Configure the drive(s) anyway you like just as long as you leave enough free space for Squid to run properly.

Once the minimal install is complete configure network connectivity on both servers.

vi /etc/sysconfig/network-scripts/ifcfg-eth0


vi /etc/sysconfig/network-scripts/ifcfg-eth0


Both servers

vi /etc/resolv.conf


If you are not running a local DNS server or you cannot register your server addresses then you will need to program the hosts file on each server. If you can register the server eth0 addresses with the DNS, do it now and skip coding the hosts file.

/etc/hosts 	localhost

Next get your system current

yum update

And install the basic packages that will be used.

yum install nano squid

I use nano as the primary text editor from this point forth, but you can use whichever particular text editor is your preferred editor.


4. Squid setup

Now that we have the basic servers setup, updated, and have our software installed lets get our Squid siblings talking and ready to take some traffic. Start with the squid.conf file

nano /etc/squid/squid.conf

#Set ACL for Squid siblings 
acl squidPeers
acl squidPeers
http 3128 transparent
wccp_version 4
wccp2_service standard 0
#Set WCCP to use GRE
wccp2_forwarding_method 1
wccp2_return_method 1
#ICP options
icp_port 3130
icp_access allow squidPeers
#Set Squid siblings
cache_peer  sibling 3128 3130 proxy-only

Replace with the appropriate entry. For example the line on would read:

cache_peer sibling 3128 3130 proxy-only
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