Running two servers inside network

[Robert F. Kennedy]

A few weeks ago my RH9 server got infected with a virus through PHP and was
doing DoS attacks on Google (a Microsoft virus perhaps) and Jason, Tim,
Peter, Eric and Neil suggested that I scrap the old server and start fresh.
I am just getting around to that task now. I have a new machine with CentOS
installed (thanks to another TLUG member I enjoyed beer with last Tuesday
night but whose name I've forgotten). This is an excellent upgrade path for
someone running RH9. 

To test the new machine I went into my WRT54G Linksys router and changed the
DMZ from 192.168.2.39 (old machine) to 192.168.2.55 (new machine). Did my
testing late at night but when I set the DMZ back to the old machine it
stopped working.  This gave me quite a scare because by looking at logs and
so on it should have been working. Zonked I went to sleep and when I got up
this morning it just started working again around 11:30AM. I have no idea
why it stopped working for about ten hours but I am looking for advice on
how I can switch back and forth without encountering this problem.

Thanks for any advice,
Robert
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