In message <46e76f620901210952s3a357724w44e08804484fb...@mail.gmail.com>, Josh
Kuo writes:
> > 1) If a reply is over 512 bytes, which can't in theory be done via UDP,
> > should the queried server reply telling my resolver to ask again using
> > TCP? Assuming, as one normally should, that there are firewalls, the
> > queried server can't simply reply TCP, as it would get blocked.
>
> I am not sure about the UDP size question, but I am pretty sure this
> is a client behavior, i.e. the server does not send back a reply to
> tell the client to use TCP port, but client should try UDP, fails, and
> switch to using TCP.
Correction, the server sends back a UDP reply with TC set in the
flags. The client then initiates a TCP based query. Please
read RFC 1034 and RFC 1035.
Mark
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Mark Andrews, ISC
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PHONE: +61 2 9871 4742 INTERNET: mark_andr...@isc.org
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