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Zone transfers are over TCP
11-14-2013, 08:48 AM
Post: #1
Zone transfers are over TCP
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Does zone_transfer_acl option use TCP or UDP to send data to slave?

zone_transfer_acl uses TCP to send zone transfer data (it's far too big for 512-byte UDP)

Quote:If fetchzone also works with UDP only I could disable TCP.

fetchzone uses only TCP

Zone transfers are the only case where one uses DNS-over-TCP in the real world (these days, people use EDNS0 to make bigger then 512 bytes DNS packets, but that is its own can of worms and not supported by MaraDNS/Deadwood)
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