using NAT Router, can't block gmail, can I use Linux box instaed of NAT Router?

using NAT Router for small office, can't block gmail, can I use Linux
box to block gmail (all web based e-mails) instead of NAT Router to do
block, will it support?. Thanks

(E-Mail Removed) wrote:
> using NAT Router for small office, can't block gmail, can I use Linux
> box to block gmail (all web based e-mails) instead of NAT Router to do
> block, will it support?. Thanks


If you need to allow other Web traffic, you're OOL. The
webmails are just web pages and they cannot easily be
distinguished from valid web traffic by the firewall.

--

Tauno Voipio
tauno voipio (at) iki fi

Tauno Voipio wrote:

> (E-Mail Removed) wrote:
>
>> using NAT Router for small office, can't block gmail, can I use Linux
>> box to block gmail (all web based e-mails) instead of NAT Router to do
>> block, will it support?. Thanks
>
>
>
> If you need to allow other Web traffic, you're OOL. The
> webmails are just web pages and they cannot easily be
> distinguished from valid web traffic by the firewall.
>
I don't think the original poster was at all clear in describing what
he/she wants to do. You could indeed block access to a particular
web site, knowing its IP address. But when I read the posting, I
thought the concern was with incoming mail from such web based e-mails
(and there are many others besides gmail). So I think we need
clarification. Or perhaps the OP is clueless (as evidenced by the
gibberish about NAT, which seems quite irrelevant).

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

> can I use Linux box to block gmail (all web based e- > mails) instead of NAT Router to do
> block, will it support?.

<snip>

Well, I assume, you are running on low bandwidth connectivity and those
web based mails are hogging your surfing a big time. Should that is the
case, you can use linux box with squid cache as http
accelerator/transparent proxy. You might also choose SquidGuard for
site filtering. You can use some kind of settings like white/blacklist
with squid and iptables, the tools for NATing in linux.

While in Squid, the basic tool, edit squid.conf - it's configuration
file in the/etc/squid directory

acl bad url_regex "/etc/squid/squid-block.acl"
http_access deny bad

Then, add those sites in squid-block.acl file

..web_based_mail.com
mail.web_based_mail.com
.....

HTH

--
Raqueeb Hassan
Bangladesh