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in transparent squid ne need to configure browser to perticular port like 8080 and 3128.

in this mode first edit your squid.conf file

by typing in terminal

vim /etc/squid/squid.conf

edit line may be 89 in 2.6 version

http_port 192.168.0.1:3128 transparent

( where 192.168.0.1 is your local interface address )

and set visible_hostname to localhost

and insert below lines under tag
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

acl our_networks src 192.168.0.0/24 192.168.2.0/24
http_access allow our_networks

(use gedit if not familier with vim )

now start squid by typing

/usr/sbin/squid -z

now flush all rules of iptabes for transparent mode

iptables -F

iptables -t nat -F

iptables -t mangle -F

now delete this chanis bye

iptables -X

iptables -t nat -X

iptables -t mangle -X

now time to save iptables so type

service iptables save

service iptables restart

now all rules and chains will clear !

check it by /etc/sysconfig/iptables which has all defaults rules set to accept.

now /etc/rc.d/rc.local

and insert line

echo ” 1 “> /proc/sys/net/ipv4/ip_forward

and then save and close.

now asuming that your internet interface is eth0 then type :

iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

service iptables save

service iptables restart

note:- check your service of iptables is set to start during boot up .

or check status of your iptables service

chkconfig –list iptables

if level 5 is on then its ok othewise start service at level 5 or level 2345.

its very simple to masquerade ( internet connection sharing in window’s language ) in linux with few lines of iptables and ip_forward commands.

first of all you have to flush and delete existing firewall rules which are be default bye linux .

so flush rules bye typing in terminal

iptables -F

iptables -t nat -F

iptables -t mangle -F

now delete this chanis bye

iptables -X

iptables -t nat -X

iptables -t mangle -X

now time to save iptables so type

service iptables save

service iptables restart

now all rules and chains will clear !

check it by /etc/sysconfig/iptables which has all defaults rules set to accept.

now /etc/rc.d/rc.local

and insert line

echo ” 1 “> /proc/sys/net/ipv4/ip_forward

and then save and close.

now asuming that your internet interface is eth0 then type :

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

service iptables save

service iptables restart

note:- check your service of iptables is set to start during boot up .

or check status of your iptables service

chkconfig –list iptables

if level 5 is on then its ok othewise start service at level 5 or level 2345.