[30609] in North American Network Operators' Group
RE: lame delegations
daemon@ATHENA.MIT.EDU (Greg A. Woods)
Sat Aug 19 12:59:08 2000
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From: woods@weird.com (Greg A. Woods)
To: Karyn Ulriksen <kulriksen@publichost.com>
Cc: nanog@merit.edu (North America Network Operators Group Mailing List)
In-Reply-To: <0127E258EE29D3118A0F00609765B44847CB2C@dhcp-gateway.sitestream.net>
Reply-To: woods@weird.com (Greg A. Woods)
Message-Id: <20000819165625.8C93D8F@proven.weird.com>
Date: Sat, 19 Aug 2000 12:56:25 -0400 (EDT)
Errors-To: owner-nanog-outgoing@merit.edu
[ On Friday, August 18, 2000 at 14:08:49 (-0700), Karyn Ulriksen wrote: ]
> Subject: RE: lame delegations
>
> With this in mind, then is it just a failing of BIND that it only recognizes
> the first PTR record and disregards the rest (unlike the typical A record
> format used for round-robin) ?
Unless I misunderstand what you mean, my version of BIND (8.2.2p3)
doesn't do that.
$ host -a 2.254.92.204.in-addr.arpa
2.254.92.204.in-addr.arpa PTR most.weird.com
2.254.92.204.in-addr.arpa PTR mail.weird.com
I don't think it round-robins them though (that's the order they appear
in my zone file and several queries in a row always return them in that
order -- I've not read the code recently so I don't remember for sure),
because normally you don't want to round-robin them, and if you did you
wouldn't be able to distinguish between the primary host and its aliases
with the BIND resolver library:
$ host -a 204.92.254.2
Name: most.weird.com
Address: 204.92.254.2
Aliases: mail.weird.com
(The "primary", or "official" hostname comes from the "h_name" field of
"struct hostent", which is returned by gethostbyaddr() and friends.)
> << Yes, I know what kind of flack that this
> will lead to, but the logic isn't that wierd...
I can't give you any flack about multiple PTRs, I use them too! :-)
--
Greg A. Woods
+1 416 218-0098 VE3TCP <gwoods@acm.org> <robohack!woods>
Planix, Inc. <woods@planix.com>; Secrets of the Weird <woods@weird.com>
