Re: snort.conf

[James Riden <j.riden () massey ac nz>]

"AJ Butcher, Information Systems and Computing" <Alex.Butcher () bristol ac uk> writes:

> --On 20 April 2004 19:18 -0400 Matt Kettler <mkettler () evi-inc com> wrote:
>
> > In general, EXTERNAL_NET should be set to whatever IP addresses you want
> > to monitor as potential sources of attack. "any" is a good starting
> > point, but !HOME_NET also has it's merits in that you save CPU time by
> > not checking packets generated by your own network as a source of attack.
> >
> > However, what you want/need to monitor is very dependent on what kind of
> > network you run. For example, if you worked for a university, it might
> > well be that you would reverse the typical meanings of HOME and EXTERNAL
> > and monitor for attacks coming from your computer labs and being launched
> > into the rest of the world.
>
> ...or even monitor from any to any. :-)
>
> IMHO, just like outbound (aka egress) filtering, this is good practice
> and shouldn't just be done by universities.

A lot of my signatures, especially for viruses/worms look for stuff
originating from inside and heading anywhere. Frankly, I expect there
to be viruses outside, so that's not news. If it's coming from inside,
panic time.

It comes naturally after a bit of tweaking - except with flexresp I'm
very careful not to send RSTs/port unreachables to external addresses.

-- 
James Riden / j.riden () massey ac nz / Systems Security Engineer
Information Technology Services, Massey University, NZ.
GPG public key available at: http://www.massey.ac.nz/~jriden/




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