[dns-wg] Matching forward and reverse DNS for DSL pool addresses

ok - Thanks to all that replied.  We already provide matching forward and reverse - I just wanted to verify that it was definitly required as I am currently reviewing our DNS management processes.

Regards

Brian

-----Original Message-----
From: Jim Reid [mailto:jim at rfc1035.com]
Sent: Wednesday, December 01, 2004 12:48 PM
To: Wilkinson,BJ,Brian,XJG11 R
Cc: dns-wg at ripe.net
Subject: Re: [dns-wg] Matching forward and reverse DNS for DSL pool
addresses 


>>>>> "brian" ==   <brian.wilkinson at bt.com> writes:

    brian> Can anyone confirm whether DSL (and dial) providers are
    brian> required to provide matching forward and reverse DNS for
    brian> the address pools or is a wildcard in the reverse zones
    brian> sufficient? 

There's no requirement. Though your customers might appreciate it if
reverse lookups worked for the IP addresses. Sometimes applications
will make life difficult for hosts that don't have working reverse
DNS. For instance a client that initiates an SMTP connection may be
considered a spam source if there's no sensible answer to a reverse
lookup of the client's address.

And as Peter has said, wildcards are probably not a good idea for this
sort of thing. It could also break when the application does a
forwward lookup of the name returned by a reverse lookup. The BSD r-
protocols -- which I hope nobody uses any more -- do this to decide if
the client is who they claim to be and therefore determin if the
client is trusted or not.