Snort mailing list archives

Re: ipvar EXTERNAL_NET


From: Edwin Smulders <edwin.smulders () northwave nl>
Date: Tue, 18 Nov 2014 20:50:12 +0100

I don't believe it is. The way I understand it, HOME_NET is the space you
are protecting. EXTERNAL_NET is the world wide web. Many rules depend on
this direction being right. If you write your own rules, it matters less,
ofcourse.

On 18 November 2014 20:45, Peggs Randahl <Randahl.Peggs () gemalto com> wrote:

 Most examples I see on the net define HOME_NET in various ways and then
define the EXTERNAL_NET as being anything not HOME_NET.



Is it ever appropriate to define both in the opposite way.  For example,
specifically define your EXTERNAL_NET as 1 or more external interfaces or
internet facing CIDR addresses and then define HOME_NET as being anything
that’s not EXTERNAL



EXAMPLE:

ipvar EXTERNAL_NET 205.2xx.xx.X

ipvar HOME_NET !$EXTERNAL_NET



Regards,

RJ
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