HI!
for external DNS server (OPENDNS, ISP DNS, etc) corect setup:
external WAN or ANY* ??
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Maybe one in a thousand sites will need to bind a definition to an interface. The 99.9% of the time it's not necessary, it's likely to cause mysterious problems.
I would say that you should never choose Internal, External, DMZ, etc.; always choose > unless told to change it by an Astaro Support engineer.
Cheers - Bob