[dns-wg] Comparing TCP and UDP response times of root name servers

It might be worth looking at whether the servers support multiple
queries over one connection, and whether they support pipelining, and
what - if any - difference that makes.

A 2nd, and any subsequent, query on a TCP connection won't incur the
cost of a handshake, and if pipelining is handled correctly - using
Nagling, or TCP_CORK/TCP_NOPUSH, then responses can co-habit TCP
packets.

I can tell from real-world metrics that at least some resolvers do
support, and actually make, multiple requests over the same TCP
connection - though they are rare.

On Wed, Oct 17, 2012 at 1:49 AM, Anand Buddhdev <anandb at ripe.net> wrote:
> [Apologies for duplicates]
>
> Dear colleagues,
>
> The RIPE NCC has just published an article on RIPE Labs, comparing the
> TCP and UDP response times of DNS queries to the root name servers:
>
> https://labs.ripe.net/Members/bwijnen/tcp-udp-dns-soa-rt-ratio
>
> Your comments, questions and suggestions are welcome.
>
> Regards,
>
> Anand Buddhdev
> RIPE NCC
>



-- 
Colm