Time Capsule DHCP and OS X Server

Good morning!

I have a PowerMac G5 with OS X Server 10.5.8 and a current-generation Time Capsule. I'm trying to make the G5 the internet-facing link in the network as it runs all the services I would run remotely. I want to bridge the Time Capsule to the G5 so that I can do that.

Here's the problem: I turned DHCP and NAT. I set the subnet to 10.0.0.x over Ethernet 2 (my LAN). I went into AirPort Utility on my iPad (the G5's is too old for my Time Capsule) and set it to bridge mode. But when I connect any devices to the Time Capsule, they get self-assigned values.

Could you please help me out and walk me through configuring this? Thanks!

—Emmanuel