OS/400 susceptible to JOLT attack

["Neil O'Reilly" <NOReilly@xxxxxxxxxxx>]

We recently conducted some denial of service attacks on various servers in
our LAN as part of a security review. We are running OS/400 V4R2 and found
that it is susceptible to the JOLT attack which involves sending fragmented
IP packets to the host.
I am told that this attack was designed to take down Windows 95 machines but
it completely hung TCP/IP on the AS/400. Ultimately we could not actually
end TCP/IP and had to IPL. 

Has anyone come across this or similar vulnerabilities before ? Any advice
or experience would be much appreciated.

Thanks 

Neil
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