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.clarkglobalstar.com                    Globalstar, L.P.
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