access internet without any proxy setting in browser

[soumalya]

Sir
in my office I use centos 5 with squid proxy
eth0 is connected to modem (adsl-setup)
eth1 is connected to lan 172.16.0.3

all client access internet with 172.16.0.3 and 3128 proxy setting.

Now I want to access internet through squid without proxy setting, such as 172.16.0.3 as gateway

please guide me the steps

[allwimb]

when you say access internet through squid that means you'll use the proxy server. But if you wan access directly you need to check if 172.16.0.3 will let you do it (NAT enabled) all you have to do is to set the ip as your default gateway and set a DNS let's say 8.8.8.8 (google's dns) and see if you get a response when you ping an address (google.com for example).

[soumalya]

Thanks for your reply. can you please guide how to enable NAT so that I can set 172.16.0.3 as gateway to access internet. I have another problem is I have to block certain ip to access certain sites and to download certain file type.

please help.

[cyberinstru]

Hi -

Check out for more details on how to setup a transparent proxy with Squid.

Squid's transparent proxy should help you do what you have asked for.

If you end in trouble, let us know.

HTH!

[soumalya]

I have tried transparent proxy but failed, please guide me the steps. I have mentioned my setup details .


thanks in advance.

[Lazydog]

What have you done to setup the transparent proxy and why did it not work?

[soumalya]

Sir

In my centos 5 server
eth0 is connected to ppp for internet (adsl-setup)
eth1 is connected to lan 172.16.0.3
in squid

http_port 172.16.0.3:3128 transparent

#iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination 172.16.0.3:3128
#iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128

but when I use proxy setting in client browser I can access internet, but whn no proxy and gateway 172.16.0.3, I can not access.

[Lazydog]

Have a look at this page.

Linux: Setup a transparent proxy with Squid in three easy steps

[soumalya]

Sir

I have tried but no result. and
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on
acl lan src 192.168.1.1 192.168.2.0/24
http_access allow localhost
http_access allow lan

does not work in squid 2.6. or 3

[cyberinstru]

do u have the following directive set?

http_port 80 transparent

Without 'transparent', you squid ain't transparent.