Limit bandwidth

[UnknownPerson]

I have a Linux router that serves as a ip masquerading and routing (for the Internet) server for our school and I was wondering how to enable this settings:

a) Set maximum bandwith per host
b) Block a host for comunicating
c) Check the web addresses they try to open
d) Modify data going to-from the host.

Any help would be appreciated. The item B is being handled by a script which add a line to hosts.deny and another one that removes it (blocking on or off). But item A, C and D are likely to have lots of variations.

Any help is greatelly appreciated.

 

[Norwich]

For limiting and processing bandwidth, you will want some form of QoS - Quality of Service. In the 2.4 kernel you have iproute2 - for general info have a look at:

http://nirmalya_ghosh.tripod.com/Info/linuxlinks.html

Genrally, have a look at proxies for processing connections to specific remote sites, see Squid:

http://www.squid-cache.org/

and squid guard plugins:

http://www.squidguard.org/intro/

They may have related tools for modifying the data. The basic tool you could use yourself to do this is netcat "nc" but this is very low level.

 

[UnknownPerson]

And what about NetSed for item D??. Anyone ever heard of it?

And Netcat, how would it perform? (I know netcat...)