Great Circle Associates Firewalls
(January 1995)
 

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Subject: Spoof in our log?
From: labatt @ disaster . com (Chris Labatt-Simon - D&D Consulting)
Date: Fri, 13 Jan 1995 12:55:29 -0500
To: firewalls @ greatcircle . com

I know this is more appropriate to the firewall toolkit users
list, but I just wanted to see if it has anything to do with
the messages about spoofing recently discussed.

I've removed the addresses (except the != addresses) from the
message in order to protect the innocent.

The following are excerpted from our logfile:

Jan 17 11:22:30 xxx netacl[9361]: securityalert: possible spoof
host1.domain.ch/xxx.xxx.xxx.xxx != 232.227.136.0 name lookup mismatch
Jan 17 11:22:39 xxx netacl[9362]: securityalert: possible spoof
host1.domain.ch/xxx.xxx.xxx.xxx != 232.227.136.0 name lookup mismatch
Jan 17 11:22:52 xxx netacl[9363]: securityalert: possible spoof
host1.domain.ch/xxx.xxx.xxx.xxx != 232.227.136.0 name lookup mismatch
Jan 22 20:21:16 xxx netacl[4525]: securityalert: possible spoof
host2.domain.com/yyy.yyy.yyy.yyy != 232.227.136.0 name lookup mismatch
Jan 22 20:21:20 xxx netacl[4526]: securityalert: possible spoof
host2.domain.com/yyy.yyy.yyy.yyy != 232.227.136.0 name lookup mismatch

I did a lookup on the two addresses given (host1 & host2), and they 
are correct. I then did a whois on the 232.227.136.0 address and 
there is nothing listed for it.

What exactly is this message telling me?

Thanks,
Chris

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
Chris Labatt-Simon                       Internet: labatt @
 disaster .
 com 
Design & Disaster Recovery Consulting         CIS: 73542,2601 
Albany, New York                            PHONE: (518) 495-5474   
                                              FAX: (518) 432-1829 
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