Re: [DNSOP] TCP/UDP performances

Mark Andrews <marka@isc.org> Tue, 24 November 2009 20:17 UTC

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To: Daniel Migault <mglt.ietf@gmail.com>
From: Mark Andrews <marka@isc.org>
References: <51eafbcb0911240543m38c27080xc9c54cc1c3f6036c@mail.gmail.com>
In-reply-to: Your message of "Tue, 24 Nov 2009 14:43:51 BST." <51eafbcb0911240543m38c27080xc9c54cc1c3f6036c@mail.gmail.com>
Date: Wed, 25 Nov 2009 07:17:06 +1100
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Cc: dnsop@ietf.org
Subject: Re: [DNSOP] TCP/UDP performances
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In message <51eafbcb0911240543m38c27080xc9c54cc1c3f6036c@mail.gmail.com>, Daniel Mi
gault writes:
> Hi,
> We are looking for measurements on the following points :
>    - How TCP affects DNS servers performances compared to UDP?
>    - Proportion of clients that switch to TCP?

By machine or by vendor?

Every Linux, FreeBSD, NetBSD, Solaris, HPUX, MacOS, Windows box switches to TCP
by default.  General purpose computers usually support it.  The nameservers
shipped with these boxes also support TCP.

The places which don't are some middle boxes which ends up breaking
the connection between the general purpose computers and the recursive
resolvers particularly in the home market.

>    - What kind of client are they? Are they those that do not implement
> EDNS0?

Most of these general purpose computers also support EDNS though it is not
enabled by default.
 
> Feel free to provide any paper links you know.
> 
> Regards,
> 
> Daniel
> 
> -- 
> Daniel Migault
> Orange Labs -- Security
> +33 6 70 72 69 58
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org