Time Capsule (3rd Gen) seems to deny internet access to clients with a static IP address A bit of background on our: we have an Apple Time Capsule, 3rd generation, connecting to the internet through a cable modem (WAN IP is configured via DHCP).

As we can't get a signal across the house, but we do have interconnected Ethernet ports throughout the house, we've attempted to use a Buffalo (WZR-HP-G450H) router, running DD-WRT, wired to the TC and set up in bridge mode, as a repeater.

Our network was as follows:

192.168.0.1 : Time Capsule (Gateway, DHCP Server)
192.168.0.2 : Buffalo (Bridge / Repeater, DHCP Server turned off)
192.168.0.3 - 192.168.0.200 : DHCP Pool (Allocated by TC)
192.168.0.201 - 192.168.0.254 : Unallocated / Reserved

For some reason, this caused the internet to cut out every few minutes (all connections timed out, tested with ping 8.8.8.8). We called the ISP to come fix the problem, he (according to my mother) mumbled something about an IP conflict, and moved the TC over to the 10.0.0.x subnet, resulting in this setup.

10.0.0.1 : Time Capsule (Gateway, DHCP Server)
192.168.0.2 : Buffalo (Bridge / Repeater, DHCP Server turned off)
10.0.0.3 - 10.0.0.200 : DHCP Pool (Allocated by TC)
10.0.0.201 - 10.0.0.254 : Unallocated / Reserved

In theory, this works, although I can't access the Buffalo router's settings and I don't like that it's on a different subnet. I changed the Buffalo router back to 10.0.0.2, and the same problems ensued. Cue my mom complaining.

Correct me if I'm wrong, but I don't see anything possibly wrong with the last setup. Additionally, while trying to set up an OpenVPN service on the Buffalo router, and after painstakingly experimenting with various port forwarding rules, I found that the Buffalo router couldn't access the internet.

I'll spare you the details, but it turns out I can't access the internet when I connect using a static IP, even if the settings are exactly the same each time. Some screenshots:




I'm convinced this has to with (or is the source of) all of our other network problems.

This problem is driving me nuts and I have absolutely no leads: I've called both my ISP and Apple Support and neither could give me any leads. If you have any ideas or pointers, I'd love to hear them.
It sounds like you want a similar setup (all in 10.0.0.x range) as I have.
- TC: connected to my modem.
- TC: Enabled DHCP server
- Linksys router (running DD-WRT): connected to the TC with a cable running from standard LAN to standard LAN port.
- Linksys router: WAN port disabled
- Linksys router: Wireless is set top bridge

Your theory sounds good. The only thing I can think of is you made a mistake with the configuration. I included some screenshots of my configurations: