Snort mailing list archives

RE: Pass Rule not working?


From: "Slighter, Tim" <tslighter () itc nrcs usda gov>
Date: Wed, 24 Jul 2002 12:19:05 -0600

have you thought about creating a separate conf file called test.conf and
placing that rule and ONLY that rule in there and then running snort with
all the options (might have to drop the output line for mySQL into it as
well) to see if the pass rule is misbehaving ?

-----Original Message-----
From: Steve Lebeda [mailto:stevele () wyoming com]
Sent: Wednesday, July 24, 2002 11:32 AM
To: Matt Kettler; snort-users () lists sourceforge net
Subject: Re: [Snort-users] Pass Rule not working?


Don't think so. I have my daemon set up to run -o.

Been running the command /usr/local/bin/snort -u Snorter -o -U -d -D -c 
/etc/snort/snort.conf -i eth1 -l /var/log/snort in /etc/rc.d/init.d/

I thought that was the problem too, but it doesn't solve anything for me.

And since it came in while I was typing this one:

In response to Shane: I know that *.*.*.* isn't a valid IP, I just didn't 
see any particular reason to hand out the IP addresses of my servers. The 
stars are supposed to represent an actual  IP address, not a wildcard, 
since the snort wildcard is indeed any. Thanks, though.

Steve


At 01:18 PM 7/24/2002 -0400, Matt Kettler wrote:
Is this by chance the answer you need? (from the snort FAQ)

4.7 --faq-- --snort-- --faq-- --snort-- --faq-- --snort-- --faq--

Q: Why does the program generate alerts on packets that have pass rules? 
A: The default order that the rules are applied in is alerts first, then 
pass rules, then log rules. This ordering ensures that you don't write 50 
great alert rules and then disable them all accidently with an errant pass 
rule. If you really want to change this order so that the pass rules are 
applied first, use the "-o" command line switch.


At 10:48 AM 7/24/2002 -0600, Steve Lebeda wrote:
I've been getting alerts in ACID because of ICMP packets. The message is 
ICMP Destination Unreachable (Communication Administratively Prohibited)
I know this particular issue has been addressed previously and I think I 
understand why it's happening. The servers on my Home Net are trying to 
ping to places that they aren't allowed to ping and the packets are being 
returned by an intermediary device. Trying to be clever, I wrote a pass 
rule in my local.rules file:

pass icmp any any -> *.*.*.* any (itype: 3; icode: 13)

I'm still getting errors.

What'd I do wrong?

Steve



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