8 Aug
2007
8 Aug
'07
8:35 p.m.
... but a TCP connection will consume a significant amount of a name server's resources.
...wrong.
Wanting to understand this comment, ...
the resources given a nameserver to TCP connections are tightly controlled, as described in RFC 1035 4.2.2. so while TCP/53 can become unreliable during high load, the problems will be felt by initiators not targets. (this is why important AXFR targets have to be firewalled down to a very small population of just one's own nameservers, and is why important zones have to use unpublished primary master servers, and is why f-root's open AXFR of the root zone is a diagnostic service not a production service.)