[124279] in North American Network Operators' Group
RE: DNS TXT field usage ?
daemon@ATHENA.MIT.EDU (Tarig Yassin)
Mon Mar 29 15:07:40 2010
From: Tarig Yassin <tariq198487@hotmail.com>
To: <jul_bsd@yahoo.fr>, <nanog@nanog.org>
Date: Mon, 29 Mar 2010 22:06:08 +0300
In-Reply-To: <4BAF45D7.5000102@yahoo.fr>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Jul
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Dkim =2C SPF =2Cand Domainkey are sender authentication methods for email s=
ystem. Which use Public Key Cryptography.
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The mail server apends signiture to every outgoing message using private ke=
y. the recepient mail server to verify needs the public key which placed in=
the sender DNS server. =20
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see
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dig suin.edu.sd txt --> for SPF
dig _domainkey.suin.edu.sd txt --> for DKIM
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regards=2C
--=20
Tarig Y. Adam
Chief Technology Officer
Sudanese Universities' Information Network (SUIN)
T: +249925659149
w: www.suin.edu.sd
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> Date: Sun=2C 28 Mar 2010 14:04:39 +0200
> From: jul_bsd@yahoo.fr
> To: nanog@nanog.org
> Subject: DNS TXT field usage ?
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> Hello=2C
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> While watching some parked domains=2C I recently observed one which has a
> TXT field containing some crypto value=2C something like a ssh key/RSA 51=
2
> or 1024 output (only the crypto part 'cvxvcvcxvcxv=3D' ).
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> For now=2C I have referenced the following usage of TXT
> - DNS Server information/version
> - SPF (format like "v=3Dspf1 a mx -all") [1]
> - DKIM (format like "k=3Drsa\=3B t=3Dy\=3B p=3DMIGfMA0GCSqGSIb3 [...]
> YA+OwSMWQIDAQAB"=2C but always in _domainkey.<domain>) [2]
> - not DNSSec as I supposed first (only DNSKEY=2C RR=2C RSIG=2C NSEC=2C no=
t TXT)
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> Does someone know at what kind of usage this kind of value could
> correspond ? (even if=2C nearly everything is possible)
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> Maybe somebody knows of a webpage referencing common usage of DNS fields =
?
> I found http://www.iana.org/assignments/dns-parameters but it points
> only on RFC not practical usage.
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> Thanks a lot.
> Best regards=2C
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> Jul
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> [1] http://en.wikipedia.org/wiki/Sender_Policy_Framework
> [2] http://www.ietf.org/rfc/rfc4871.txt (7.4)
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> Note: current RFC referencing TXT field is
> http://www.ietf.org/rfc/rfc1035.txt
> "TXT RRs are used to hold descriptive text."
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