Hi,
You can use Squid Cache + [content filtering ] + Apache mod_proxy +
RewriteMap in mod_rewrite + your own script to process requests passed to it
from RewriteMap + Netfilter + IPRoute2 Traffic Control (TC tool).
Or just [content filtering] + Apache mod_cache + mod_proxy + mod_rewrite +
Netfilter + TC Tool.
You can also use Snort + [ snortSnaf, etc. ] + Netfilter + TC tool.
Or you can use hogwash + TC tool.
I don't know if you can do it just with Squid + IPTables as he mentioned,
but I'm sure you eventually gonna want to use a traffic shaper (TC tool)
somewhere.
Just to tell ya that if you are doing it to slow down those downloads, might
as well post up a user policy that they are responsible for their own
bandwidth usage and just do IPRoute2 traffic shaper and a suitable Qdisc to
fair share available bandwidth among people on your network. A lot less
hassle and less bugs / security problems.
Good luck.
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