[dns-operations] EDNS buffer size on TCP connections?
David C Lawrence
tale at akamai.com
Wed Jun 22 14:53:30 UTC 2016
bert hubert writes:
> While working on a PowerDNS bug, I wondered: what do I fill out on the
> buffer size field of the EDNS record on a TCP/IP connection?
In client requests it is in effect ignored by the DNS/TCP
implementations with which I am familiar because it is explicitly
defined as the UDP payload size.
A responder can still set it to the maximum payload size it would
support for future UDP transactions.
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