Time Capsule: IPv6 works, but IPv4 does not

I have a Time Capsule (running 7.7.3) and a Mac Pro (2010, running 10.10.1) connected via ethernet. My ISP (Webpass) has IPv6 support.
The Mac Pro can communicate over IPv6 (e.g. ping6 google.com works; I can load google.com over IPv6 using Safari).
However, IPv4 does not work. The Mac Pro isn't even getting an IPv4 address via DHCP from the Time Capsule.
I'm pretty sure I have my IPv4 configuration correct in the Time Capsule, because if I turn on wifi on the Mac Pro (using the Time Capsule as my base station), the wifi interface gets an IPv4 address, and can reach the Internet over IPv4.
Possibly relevant: 3 days ago I noticed that IPv6 wasn't being routed properly by my ISP, so I filed a trouble ticket. They fixed it 2 days ago, which is when my wired IPv4 networking broke. (Given that I can use IPv4 via wifi suggests that the problem lies with the Time Capsule).
I have tried rebooting the Time Capsule and different ethernet ports on both the Time Capsule and Mac Pro, to no avail.
How can I get wired IPv4 working again?

I wish you were running anything but yosemite on the computer as it is least reliable networking OS yet.
Factory reset the TC. Redo the setup.. please use all short names, no spaces and pure alphanumeric.. do not use the names apple wizard will recommend.. keep passwords also 8-20 character pure alphanumeric but mixed case and numbers.
In ethernet setup of the computer.. how have you got ipv6 set??
How is ipv4 set?
Have you tried static address in the Mac?
What sort of broadband is this?? If there is a modem what sort? And what mode is the TC running in?
One of the strange things that can happen.. with IPv6 you can use TC bridged to a fibre connection..
But for ipv4 to work it must be set to DHCP and NAT in the network tab.

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techgoose wrote:
I would like to know which program you're using to audit the contents of the backup.
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Time Capsule: IPv6 works, but IPv4 does not

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