Interesting...wasn't aware. Still won't convince me to open up tcp/53 to
anyone other than my secondary DNS servers, but, then again, my zone info
isn't so huge, per host, that it should require such a large response. <G>
On Thu, 21 Oct 2004, antonio tuozzo wrote:
> Hi Mike,
> this is an extract from Tcp/Ip Illustrated (R. Stevens)
> .....
> When the resolver issues a query and the response comes back with the TC
> bit set ("truncated") it means the size of the response exceeded 512
> bytes, so only the first 512 bytes were returned by the server. The
> resolver normally issues the request again, using TCP. This allows more
> than 512 bytes to be returned. Since TCP breaks up a stream of user data
> into what it calls /segments,/ it can transfer any amount of user data,
> using multiple segments.
> .....
>
> Mike Burger wrote:
>
> >Sure about that? My understanding was that TCP is only used for zone file
> >transfer type use, and UDP for queries. I hadn't heard that there was any
> >sort of TCP use for queries.
> >
> >On Wed, 20 Oct 2004, antonio tuozzo wrote:
> >
> >
> >
> >>This is true! However, normal queries are single UDP requests. DNS system uses TCP only when data size replies is > 512 bytes.
> >>On Wed, Oct 20, 2004 at 06:20:20PM +0200, Crucificator wrote:
> >>
> >>
> >>>As a matter of fact DNS uses both TCP and UDP.
> >>>
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> >>>
> >>
> >>
> >
> >
> >
>
>
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