Date: Fri, 28 Jun 1996 09:51:23 -0500 From: Alex Nash <alex@fa.tdktca.com> To: Ollivier Robert <roberto@keltia.freenix.fr> Cc: nate@mt.sri.com, current@FreeBSD.ORG Subject: Re: IPFW bugs? (fwd) Message-ID: <31D3F16B.6F05A07E@fa.tdktca.com> References: <199606281414.QAA25287@keltia.freenix.fr>
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Ollivier Robert wrote:
>
> It seems that Alex Nash said:
> > I believe DNS/tcp is for zone transfers only. DNS/udp is all you need
> > for standard lookups.
>
> Not really. If named see that the answer will be more than 512 bytes in
> size, it will send the answer with the TF (truncated flag) bit set and the
> resolver is supposed to re-try the query with TCP.
Does our named do this? I (briefly) went looking for this behavior and
found:
if (hp->tc) {
count -= arcount; /* truncation had to affect this */
if (!arcount) {
count -= aucount; /* guess it got this too */
}
if (!(arcount || aucount)) {
count -= ancount; /* things are pretty grim */
}
/* XXX - should retry this query with TCP */
}
Alex
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