Hi Sara,
Am 06.01.16 um 13:16 schrieb Sara Dickinson:
On 5 Jan 2016, at 22:11, Martin Stiemerling <mls.i...@gmail.com> wrote:
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COMMENT:
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One comment and request for clarification:
In the first paragraph of Section 8:
" DNS clients and servers SHOULD pass the two-octet length field, and
the message described by that length field, to the TCP layer at the
same time (e.g., in a single "write" system call) to make it more
likely that all the data will be transmitted in a single TCP segment.
This is both for reasons of efficiency and to avoid problems due to
some DNS server implementations behaving undesirably when processing
TCP segments (due to a lack of clarity in previous standards). For
example, some DNS server implementations might abort a TCP session if
the first TCP segment does not contain both the length field and the
entire message.
"
This paragraphs says that DNS servers process segments. This is slightly
inaccurate, at least under the assumption that DNS clients and servers
are user land processes.
Such a user land process does not see segments but data being read or
written to the sockets. And such data might be one or multiple segments
concatenated.
I do understand the text, but I would like to propose a change (though
the proposed text might not be perfect):
This is both for reasons of efficiency and to avoid problems due to
some DNS server implementations behaving undesirably when reading
data from TCP (due to a lack of clarity in previous standards). For
example, some DNS server implementations might abort a TCP session if
the first data part read from TCP does not contain both the length
field and the
entire message.
Yes, this is better. To be consistent with the rest of the wording in that
section, I would propose minor tweaks:
“This is both for reasons of efficiency and to avoid problems due to
some DNS server implementations behaving undesirably when reading
data from the TCP layer (due to a lack of clarity in previous standards).
For
example, some DNS server implementations might abort a TCP session if
the first “read" from the TCP layer does not contain both the length
field and the entire message."
WDYT?
This WFM!
Thanks,
Martin
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