Snort mailing list archives
Re: External Subnets
From: Erwin Van de Velde <erwin.vandevelde () ua ac be>
Date: Wed, 26 Nov 2003 02:27:52 +0100
I haven't tried it yet, and while it's 2:30 AM here in Belgium it will have to wait till tomorrow :-) But I think yes, and if not, why don't you say then var NETWORK = 192.168.0.0/24 var EXTERNAL_NET = !$NETWORK for example? Although I don't think it's such a good idea to take anything else than 'any' for the $EXTERNAL_NET, as many attack rules are based on the fact that the attacker is on the external net. By setting this to something like !$NETWORK, every employee in your firm on $NETWORK can attack any host on your network unnoticed, which cannot be what you meant it to be I think... Any ideas on this? Greetz, Erwin Van de Velde Student of the Antwerp University, Belgium On Wednesday 26 November 2003 01:10, adam_peterson () splwg com wrote:
Is it possible to specify a negative variable value for a variable? Meaning: var EXTERNAL_NET !HOME_NET The bang is just an idea of something that would negate the value so that my external_net variable would be any ip/subnet that isn't part of the home_net variable. Is there anything in place to allow for this? Could there be? Since so many of the rules are based on the external_net variable, it's very frustrating that it must be set to ANY for my configurations because I can't specifiy every subnet on the Internet...or can I? Any help/advice is greatly appreciated. Adam Peterson | Senior WAN Engineer | SPL WorldGroup | adam_peterson () splwg com
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Current thread:
- External Subnets adam_peterson (Nov 25)
- Message not available
- Re: External Subnets Matt Kettler (Nov 25)
- Message not available
- Re: External Subnets Erwin Van de Velde (Nov 25)
- <Possible follow-ups>
- Re: External Subnets adam_peterson (Nov 25)