This is in relation to Back to My Mac and "roaming" or even "wds" airport base stations.
If you follows articles such as http://support.apple.com/kb/HT4260 or http://support.apple.com/kb/HT4262 to setup a roaming network, what they leave out is that inorder for Back to My Mac to work you need to have the "DNS Servers:" field filled in with valid DNS servers. This is more of a problem for "Extended Wi-Fi base stations" because "Primary Wi-Fi base stations" can have their DNS server automatically assigned by your ISP.
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