Re: Why is this rule still being tripped?

[Orion Poplawski <orion () cora nwra com>]

Martin Roesch wrote:

> Have you tried making a negated TRUSTED_NET set and using that 
> instead  of the global negation?  I need to look at the logic, but I 
> think that  none of the IPs in TRUSTED_NET can match for the rule to 
> fail.
>
> Have you tried it with just the one net you want to ignore to narrow 
> it  down to the IP list?
>
>      -Marty
Well, this doesn't change anything (as you would expect):


var TRUSTED_NET 
[65.171.192.0/24,192.168.0.0/24,65.104.69.192/27,207.202.149.0/24,12.105.80.64/27,69.9.9.160/27]
var PUBLIC_NET !$TRUSTED_NET

alert icmp $PUBLIC_NET any -> $HOME_NET any (msg:"ICMP PING"; itype: 8; 
icode: 0; sid:384;  classtype:misc-activity; rev:4;)


What I don't understand is that I have:

var HOME_NET [65.171.192.0/24,192.168.0.0/24]
var EXTERNAL_NET !$HOME_NET

and those rules work.  Perhaps it is an issue when both IP addrs are 
negated lists?

If I do:

var TRUSTED_NET 65.104.69.192/27
var PUBLIC_NET !$TRUSTED_NET

Then the rule does not trip on $PUBLIC_NET->$HOME_NET traffic.

--
Orion Poplawski
System Administrator                   303-415-9701 x222
Colorado Research Associates/NWRA      FAX: 303-415-9702
3380 Mitchell Lane, Boulder CO 80301   http://www.co-ra.com



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