Keyword traffic filtering

Question

Computer networks

How can (and better?) implement filtering of Internet traffic by keywords in linux/bsd? The simplest possible solution is desirable. Open source would be a plus.

Answer 1

If only HTTP is enough, then 3proxy can filter by PCRE .

Answer 2

what kind of traffic? http? then squid

Answer 3

I did not immediately understand, if you need to parse content, then I would take a closer look at dansguardian.org/ . to be honest, I didn’t work closely with him, so I set it to indulge to see what was happening.

Answer 4

severely iptables -m string can block

Answer 5

I set sams - squid management through the web face. There, and by keywords and sites, you can block as far as I remember.
I thought that the project had stalled, but as I see it is slowly developing.
I installed the first version (1.0.5), the second one is not released yet.

Answer 6