Tiger Server won't acquire address via cable modem

I have a PowerMac G4 setup to act as a front end for a network. Its running 10.4.3 server. The gateway setting are all setup and ready for DHCP clients but when i plug in my modem cable, the server fails to acquire a proper address. But if i plug my modem cable into my Powerbook running OS X 10.3.9 it configures fine. I can't seem to figure out what i setup wrong on the server that would cause it to misconfigure.

When you got your cable modem service, did you get online from your Powerbook before your G4?
Often times cable modem ISP's will only allow one computer to get a DHCP address, and to thus get online. It usually only allows the first computer it 'sees,' based on MAC addresses ('Media Access Control', not short for Macintosh).
Sometimes you can solve this by powering off your cable modem and attached switches for an extended period (try overnight, to be safe), then turning them back on, and make sure to ONLY connect with the G4.
I've also seen cases where the above didn't work (with RCN specifically), and I needed to call the ISP and have them do one of the following:
1) Manually clear the MAC addresses from the modem
2) Update the modem firmware to resolve a bug which wouldn't allow DHCP to work even after the modem was cleared.
iBook G4 Mac OS X (10.4.3)

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@stix180
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atotheb, Welcome to the discussion area!
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Hi. I need help. I just bought an airport express to get wireless internet and airtunes. I connected everything and ran the airport utility. Everything is good, so it says. I can play music through my stereo using airtunes, but when I try to get on the internet I get nothing. My macbook recognizes the network, but I can't load any pages. I've tried unhooking the ethernet from the express and unplugging the power from my modem, then plugging my modem back after about 30 seconds, then reconnecting the ethernet to the airport after another 30 seconds but still, nothing.
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...And now it all of a sudden works. However, as I can't delete this post I hope others who have had similar problems may have solutions for future issues.

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I have this setup and it works quite well.
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EQUIPMENT
Modem: Motorola SurfBoard SB6121
Router 1: Apple Time Capsule
Wireless Extender: Apple Airport Express
Router 2: Linksys WCG-310N

The new modem is configured to only hand out one public IP Address. Nothing you can do but call them and try to get a higher level tech support.
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

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Hello,
Though all of these steps may or may not be needed, I'm including them all.
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
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208.67.222.222
208.67.220.220
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Tiger Server won't acquire address via cable modem

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