RE: OS/400 IP spoofing vulnerability -- MIDRANGE-L

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I see your point and agree.  Yes our firewall is doing NAT for us.  Yes we
have had problems with outbound VPN connections thru our firewall.
Configuring the firewall correctly for these connections allows them to pass
thru and work.  I still feel strongly with having a firewall protecting your
network.

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: Scott Klement [mailto:klemscot@klements.com]

Your firewall changes the TCP sequence numbers of your packets?
Seriously?   It's doing a lot more than just being a firewall, then...
it's more akin to NAT.

There are many times when you don't want your firewall messing with the
contents of TCP/IP datagrams, and many instances where it is just not
practical or logical to do.

The operating system SHOULD be changed to not use predictable sequence
numbers.  OS/400 is intended to be a secure operating system, you should
not need a 3rd party hack to make it safe.

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