Version 6.0 of the PIX software will give you port information when blocked
by ACL's. I have used this image a number of times and have no problems with
it. Getting information on what ports were being blocked on an ACL's was a
god send in certain ISP environments I was installing and in most cases was
expected/taken for granted by the customer!!
regards,
Erik
-----Original Message-----
From: MIKE.DONOFRIO_at_desertschools.org
[mailto:MIKE.DONOFRIO_at_desertschools.org]
Sent: 06 July 2001 21:14
To: erik.nodland_at_tns.co.uk
Subject: Fwd: Re: spoofing 255.255.255.255 techniques
Just FYI
Using ACL's does limit the information you get to the Syslog server
compared to what you would get using Conduits. Cisco was supposed to be
working on a fix for it. On Revisions of code before 5.3.1 you would just
get Protocol XX (ie 6,17,1) and no port.. At least after 5.3.1 you get
TCP,UDP... I have contacted Cisco several times on this issue and I get the
"Next Release" responce :) Anyone know if this is fixed in 6.0?
Regards,
Mike D'Onofrio
> Our PIX does not indicate source or destination ports
> perhaps because the "IP spoof" criteria was already
> triggered in its logic chain, denying the packet and
> making a syslog entry.
It's been my experience that the PIX will not provide port information if
the packet is blocked by an ACL. However, it *will* provide port
information if the packet is blocked because there is no "conduit"
allowing the traffic.
I'm not sure if the spoof detection mechanism supercedes this.
Hope this helps.
-Blake
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Received on Jul 11 2001
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