10.5.6 setup on mini with USB nic, not receiving DHCP from WAN (cable modem

Hello,
I'm probably in a little over my head thinking I could configure MacOS X Server without much IT knowledge. But I started, so I'm not giving up yet.
Here's my setup:
— cable modem ethernet connects to USB nic (the apple macbook air one) plugged into mac mini running 10.5.6 Server
— ethernet on mac mini connects to switch
— switch connects to airport base station set-up as bridge
— in the future other computers will connect over ethernet to the switch (that's why mac mini isn't plugged into base station directly)
Here's the issue:
— cable modem uses DHCP (no fixed IP).
— when first installing 10.5.6 Server, modem was connected directly to ethernet on mac mini, and picked up everything from DHCP, worked fine. Ran all the system updates (started with a 10.5 initial install)
— after everything was installed, I switched the modem to the USB ethernet adapter and ran NAT setup assistant. configured the USB Ethernet as the WAN, Ethernet as the LAN, turned on VPN.
— now the USB Ethernet won't pick up the DHCP of the WAN anymore. It did it once, and then never again.
— I've run the NAT setup assistant to switch the WAN and LAN nics to see if the USB Ethernet was the issue, but with the same results.
— This setup used to work although not quite stable on 10.5.4 server.
My initial questions:
— is the firewall blocking the DHCP?
— is the LAN DHCP messing with the WAN?
— in the previous version I had to set the replythresholdseconds from 10 to 0 in the bootpd.plist for it to hand out DHCP on the LAN, but there is no such entry in the pootpd.plist anylonger, and the keynet_address entry that was missing from the previous version of bootpd.plist is now present, so it seems the bootpd.plist has been fixed by apple.
— what am I doing wrong? Why doesn't this just work as advertised...
I know there are several of you out there that have the same setup working (I found posts from hirstey and DigiAngel with the same setup) so it must be possible. All your help is much appreciated!!
Thanks,
Hagenaer
Thanks!
Message was edited by: Hagenaer

Thanks for your reply, DigiAngel.
DSL modems differ from cable modems as far as I understand. Where DSL modems are actually routers capable of NAT/DHCP, cable modems are just a network interface/brigde and can't do any of that. So it should pass the external IP to the computer. I'm writing on a laptop with the cable modem directly plugged into it, and it picked up the external IP etc. near instantly. The mac mini did the same before I ran the NAT setup assistant. I believe it picked it up once after that, but never since.
I had done a clean install, had the ethernet plugged into its internal ethernet port (en0) and was able to download all the system updates. Then plugged in the USB ethernet, I'm pretty sure it still picked up the IP there. Ran the NAT setup assistant and can't get anything to work anymore. Even with all services switched off.
So the modem is doing its job, but when I connect it to the USB nic the connection gets a self-assigned IP in about 3 seconds after seeing the cable is connected. The one time I've seen it get the right IP, it got a self-assigned IP first and then about 5 seconds later picked up on the correct IP. (And it picked up everything, including DNS server and search domains, which this laptop I'm writing on does not, although it works just the same).
Unfortunately, this laptop runs 10.4.11 which doesn't recognize the USB nic, so I can't test the adapter outside of the server environment. But I've had the genius bar test the adapter previously and it worked fine then, plus I've run the NAT setup assistant with the connections inverted (WAN over built-in ethernet, LAN over USB ethernet) with the same results: WAN gets self-assigned IP.
I've also tried configuring manual IP for the WAN from what I saw was given to this laptop (it kept the same IP even after being disconnected/reconnected, so I guess the IP for my modem won't change IP unless I reset it. Although I'm not sure if it's correct logic to assume the mac mini would pick up the same IP as well since I think that's actually tied to the MAC address and the IP doesn't belong to the modem but to the computer behind it).
Anyway, I'm not sure what to try next...
Hm. Wait, this might have something to do with it: the firewall logs the following:
Mar 22 14:12:07 server ipfw[4997]: 65534 Deny UDP 73.227.220.1:67 255.255.255.255:68 in via en 2
Looking up 73.227.220.1 gives me dns1.inflow.pa.bo.comcast.net, clearly my provider's DNS server. Trying to get me an IP that my wirewall is denying? Turning off the firewall doesn't make it pick up the correct IP though... I have turned off all services and still just got a self-assigned IP.

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