You just answered your own question.

One can FTP to several AS/400s with no 30 sec delay.
None of these AS/400 know anything about my PC.
I'm connecting over the internet and my IP address
changes every time.

The other is only connected (through a local 3COM router) 
to one AS/400 and has the 30 sec delay.

That is the difference, the routes.  You local PC goes out one router,
probably the default, fails after 30 seconds, takes the alternate route and
connects.

Nothing to do with DNS.

Christopher K. Bipes    mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst  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

If consistency is the hobgoblin of little minds, only geniuses work here.
Karen Herbelin - Readers Digest 3/2000

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