[20629] in bugtraq
Re: Fun with IP Identification Field Values (Identifying Older MSBased
daemon@ATHENA.MIT.EDU (Crist Clark)
Tue May 15 10:41:50 2001
Message-ID: <3AFC2847.58A18DF5@globalstar.com>
Date: Fri, 11 May 2001 10:58:31 -0700
From: "Crist Clark" <crist.clark@globalstar.com>
MIME-Version: 1.0
To: Denis Ducamp <Denis.Ducamp@HSC.FR>
Cc: BUGTRAQ@securityfocus.com
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Denis Ducamp wrote:
[snip]
> Now some systems protects against been used to spoof-scan :
[snip]
> . Linux 2.4.x : IPID is null if the packet is small enought to be carried
> unfragmented in which case the DF (don't fragment) bit is set
> . others perhaps ?
Ah-ha!!! So that might be the cause of those bizarre signatures I have
been seeing. Can anyone point me to documentation of this
Linux-IP-stack-of-the-week feature? Would this and ECN (what looks to
me like broken ECN) account for,
http://www.securityfocus.com/archive/75/178231
--
Crist J. Clark Network Security Engineer
crist.clark@globalstar.com Globalstar, L.P.
(408) 933-4387 FAX: (408) 933-4926
The information contained in this e-mail message is confidential,
intended only for the use of the individual or entity named above. If
the reader of this e-mail is not the intended recipient, or the employee
or agent responsible to deliver it to the intended recipient, you are
hereby notified that any review, dissemination, distribution or copying
of this communication is strictly prohibited. If you have received this
e-mail in error, please contact postmaster@globalstar.com
