3TB Airport Time Capsule (FW 7.7.3) Incorrect DNS address delivered by DHCP
I got this hint from https://discussions.apple.com/thread/2735366?start=0&amp;tstart=0

Check out the last post from Paul Verity.


  I've just hit on this problem too, and also found that deleting the
  DNS entries in my TimeCapsules DNS configuration fixed the problem.