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If you put any server directly onto the internet you are asking for trouble.
Now if you have a firewall, it SHOULD be configured to randomize packet
headers thus preventing the attach they are talking about.  Trying to secure
individual server is way too much work.  It is easiest to secure you entire
network with a firewall.  Now if they were testing IBM AS400 Firewall
product and you are running that, then I would reconsider a new firewall
product.  What they were testing is somewhat unclear.

Christopher K. Bipes      mailto:Chris.Bipes@Cross-Check.com
Operations & Network Mgr  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.          http://www.cross-check.com
6119 State Farm Drive     Phone: 707 586-0551 x 1102
Rohnert Park CA  94928    Fax: 707 586-1884


-----Original Message-----
From: James Rich [mailto:james@eaerich.com]

I just read an interesting paper on IP spoofing.  Several systems were
tested for their TCP/IP sequence number generators and randomness.  It was
discovered that insufficiently random TCP/IP sequence numbers result in
easy IP spoofing and other attacks (see CERT Advisory CA-2001-09 for
more).  OS/400 was included in the study and found to be very lacking.
Can someone comment on what this means in terms of securing a site?


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