[root@ns1 etc]# vi /etc/squid/squid.conf
#
http_port 3128 transparent
#http_port 3128
#
[root@ns1 etc]# vi sysctl.conf
#
# Controls IP packet forwarding
net.ipv4.ip_forward =1
#

[root@ns1 etc]# cd sysconfig
[root@ns1 sysconfig]# del -r iptables
iptables
really remove them? [yiN] y
ok, removed....

[root@ns1 sysconfig]# cd network-scripts

[root@ns1 network-scripts]# vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.2
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes
Esc :q!
[root@ns1 network-scripts]# vi ifcfg-eth1
DEVICE=eth1
BOOTPROTO=static
BROADCAST=192.168.1.255
IPADDR=192.168.1.2
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=no
Esc :wq

[root@ns1 network-scripts]# cd ..
[root@ns1 sysconfig]# service iptables stop
Resetting built-in chains to the default ACCEPT policy:    [  OK  ]

[root@ns1 sysconfig]# iptables -F
[root@ns1 sysconfig]# iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128

[root@ns1 sysconfig]# service iptables save
Saving current rules to /etc/sysconfig/iptables:           [  OK  ]

[root@ns1 sysconfig]# service iptables start
Flushing all current rules and user defined chains:        [  OK  ]
Clearing all current rules and user defined chains:        [  OK  ]
Applying iptables firewall rules:                          [  OK  ]
                                                           [  OK  ]
[root@ns1 sysconfig]# service iptables status
#
Table: nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
REDIRECT   tcp  --  anywhere             anywhere            tcp dpt:http redir ports 3128
#

[root@ns1 sysconfig]#  service named restart
Shutting down named:                                       [  OK  ]
Starting named:                                            [  OK  ]

[root@ns1 sysconfig]# service network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down interface eth1:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Disabling IPv4 packet forwarding:                          [  OK  ]
Setting network parameters:                                [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:                                [  OK  ]

[root@ns1 sysconfig]# service squid restart
Stopping squid: ................                           [  OK  ]
Starting squid: .                                          [  OK  ]

[root@ns1 sysconfig]# vi iptables
#
# Generated by iptables-save v1.2.10 on Wed Mar 11 23:53:30 2015
*mangle
:PREROUTING ACCEPT [293:35628]
:INPUT ACCEPT [92609:35464443]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [253:37390]
:POSTROUTING ACCEPT [91317:42206492]
COMMIT
# Completed on Wed Mar 11 23:53:30 2015
# Generated by iptables-save v1.2.10 on Wed Mar 11 23:53:30 2015
*nat
:PREROUTING ACCEPT [4:212]
:POSTROUTING ACCEPT [4:255]
:OUTPUT ACCEPT [4:255]
[0:0] -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
COMMIT
# Completed on Wed Mar 11 23:53:30 2015
# Generated by iptables-save v1.2.10 on Wed Mar 11 23:53:30 2015
*filter
:INPUT ACCEPT [294:35808]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [255:37614]
COMMIT
# Completed on Wed Mar 11 23:53:30 2015

Esc :q!

[root@ns1 sysconfig]#