No ip with router in bridge mode

i am running a 2009 mac pro, os x server, with some minor and ultimately forgotten changes to unix level services like PHP.
it's been customized, but everything works. Except for one thing, under peculiar circumstances, and I really need help to fix the problem.
here it is as quickly as I can describe it:
I am running an airport extreme router off of my brand new FIOS router (wifi out of the airport). The FIOS router wants the airport in "bridge mode" (if you do not know what bridge mode is, you probably cannot help me,) When I set the airport to bridge mode, my computer cannot get an ip address. it can't see the router, and it doesn't seem to be able to see it at all.
I have 2 computers in addition to this (older mac pro, and a brand new Macbook Air) that don't even need to be nudged. they just work.
I have 3 iDevices that work without complaint as wel.
I also have a wii, a PS3 that, again, without any prodding, accept the change to bridge mode, and get on with it.
can anyone out there suggest any possibilities here?
the only things that are majorly different is that the airport extreme is changed over to bridge mode, and the IP address list is different. (1.92.168... vs the 10.0.1....)
I can work without being in bridge mode, but it robs me of performance, and I like to follow the rules.

Grant, the only true statement was the first one.
the APE is smart enough to do all of the other things you suggest, automatically.
I know that I mentioned that there are a lot of other devices and that They do not have any difficulty when the router is switched into bridge mode. Let me be more sussinct...
No other internet appliance on the network (and there are quite a few) has any difficulty connecting to the internet automatically and without even the slightest adjustment, once the APE is put into bridge mode.
but since I am trying to figure this out, I have more information.
first, my mac pro does seem to have an ip address from the router, in that I was mistaken. It has an IP and it cannot connect to the internet.
second, I decided to try to connect to the FIOS router's wifi directly, to try to determine where the problem is, and it appears that I have the exact same problem directly connected to the Fios Router's wifi.
any inspiration would be appreciated, but I think I might know what is going on. the Mac Pro wants one specific IP address. I think I might have given it a static IP years ago, and there might be some Unixy things I have to do to undo that.

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I want to connect a Time Capsule (latest version) to an Airport Extreme (latest version) in bridge mode. Is it possible to have a guest network with this configuration? If so, how do I configure the stations?

I currently own the latest version of Airport Extreme (not in bridge mode) and was thinking about adding a Time Capsule for extending the network in my home and for data backups.
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I am planning to link up a Dlink DIR-600 router running on the DD-WRT firmware on the bridged mode with the AE.
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DD-WRT Forum :: View topic - D-link DIR-600
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Routed or bridged mode + licensing question

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sorry Marko but I am lost. We are talking now about one-armed mode of deployment. There
are 2 contexts and the same vlan is used in both of them (that's why it is shared). In this case I don' understand what you wrote "you have server A in the shared VLAN of context A, you can not reach a VIP from context B" ... that is the same vlan so I can't see any problems..... unless you are describing situation for bridged mode deployment of ACE.

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Is there no way I could switch off part of the router so it just becomes a modem (or are they completely different things)?
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Spoiler (Highlight to read)
+--- The Configuration ---+
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