Time Capsule can't connect to the internet

Hi,
I've looked around these forums and can't seem to find a solution to my (quite specific) problem. I'll try to be as clear as I can - I'm not bad on computers, but network stuff goes way over my head.
I've just moved to Moscow, bringing my TC with me. When I arrived, the landlord had set up broadband for me, with a Motorola SB5101E Surfboard Cable Modem. I plugged the modem into my Macbook via Ethernet (no TC involved yet) and I got on the internet straight away.
Later, though, I tried to hook the modem up to my TC to get wi-fi. I plugged the Ethernet cable into the WAN port on the back.
Straight away, I had no internet access. I did a hard reset (pen on the small button on the back of the TC) and used Airport Utility to set the TC up again. Before it completed, I got the message:
'Your Apple wireless device does not have a valid IP address'.
I hadn't played around with any of the settings, using it purely to create a new wireless network. It was all set to DHCP, automatic everything.
IP address currently starts with 169.
I've tried powering down both modem and TC, for up to 12 hours at one point. I've also tried reconnecting them in various orders - ie modem first, then TC, and vice versa.
None of this is made any easier by the fact that I have no idea who my ISP is or any of that info as I have no Russian yet and my landlord doesn't speak any English.
So... is there anything anyone can suggest? I'm sorry that I can't give any more info than I have.
Thanks in advance

Welcome to the discussions!
Cable modems need a complete reset whenever the device that is directly connected to them is changed.
Power down the modem and pull the battery if it has one. Wait at least 30 minutes. (It may take your service much longer to reset).
Power down the rest of your system as well. When you are ready, power up the modem and let it run for 10-15 minutes. Then, power up the Time Capsule and let it run for 5-10 minutes and finally your computers.
If your modem has a single ethernet port, then Connection Sharing for your Time Capsule should be set to "Share a single IP address".
If you have a combination modem/router (it will have 3-4 ethernet ports), the correct setting as noted below for Connection Sharing would be "Off (Bridge Mode)"

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