hbeaumont hbeaumont schrieb:
Can anyone help me with the proper method to block outgoing requests to
botnets + irc?
Or point me in the direction of searchable list archives (I could only find
the non-searchable archives) or other FAQ that answers this?
Problem:
We have servers that could get infected via poorly wrote user scripts. I
want to prevent these servers from being used as part of botnets or general
connections to
IRC (most scripts I run across seem to try to connect to IRC). I want to
take the best preventative measures I can in case one of the machines would
become infected
or otherwise compromised.
Also, interested in any other popular method of stopping general outgoing
DOS attacks (rate limiting UDP perhaps? I'm not real up on the techniques
used by the DOS'ers).
I'm interested in the recommended rules to add to prevent this type of thing
should it occur. Thanks.
You should block the appropriate IRC portrange. Additionally you could
mark IRC packets with l7 matching and then drop them afterwards. I think
this will filter pretty much of the IRC traffic, perhaps all.
