You guys might want to check out: http://www.csh.rit.edu/~jon/papers/classless/
Classless in-addr.arpa delegation allows administrators to provide authoritative reverse DNS on subnets that don't fall on octet boundaries. It is especially useful for those subnets comprised of less than eight bits in the host portion (i.e. less than a class C). ( from the link ;-) I also seem to remember a discussion at www.acmebw.com/askmrdns about this: http://www.acmebw.com/askmrdns/archive.php?question=7 HTH, Bill Studley -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Jerry Feldman Sent: Friday, February 08, 2002 6:21 PM To: GNHLUG mailing list Subject: Re: unresolvable relay host name This may be the problem. NDEV (AKA USDatacenters) allocated us 6 addresses, 254.235.216.230- 254.235.216-235. On 8 Feb 2002 at 13:37, Derek D. Martin wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > At some point hitherto, John Abreau hath spake thusly: > > jabr@asgard:~ $ host 216.235.254.231 > > 231.254.235.216.in-addr.arpa. domain name pointer asgard.blu.org. > > > > This works fine locally on the blu.org server, where it refers to its > > own dns server on localhost. From outside the blu.org server, using > > some other dns server, the reverse lookup fails: > > Do you own the entire C block? I understand there are tricks you can > do to be responsible for a portion of a C block, and I think BIND 9 > actually has features built into it to allow for that. However, older > versions of BIND were not intended to accomodate networks smaller than > a full class C. You may need to get your upstream provider (or > whoever has been delegated to do reverse DNS for that block) to assign > reverse DNS for you, as I have had to do in the past. > > If you DO own the entire C block, you may still need to get your > provider to delegate reverse lookups for it to your server. > > According to my DNS server, US Datacenters is responsible for that C > block: > > > set type=ns > > 254.235.216.in-addr.arpa > Server: 172.16.1.1 > Address: 172.16.1.1#53 > > Non-authoritative answer: > 254.235.216.in-addr.arpa nameserver = NS2.USDATACENTERS.COM. > 254.235.216.in-addr.arpa nameserver = NS3.USDATACENTERS.COM. > 254.235.216.in-addr.arpa nameserver = NS1.USDATACENTERS.COM. > > Authoritative answers can be found from: > NS2.USDATACENTERS.COM internet address = 216.235.240.12 > NS3.USDATACENTERS.COM internet address = 216.235.240.16 > NS1.USDATACENTERS.COM internet address = 216.235.240.11 > > You'll need to get them to delegate it, or to assign reverse addresses > for you. Or play other DNS games that they may not be willing to > play. > > [They could do something like this (syntax not tecnically correct for > purposes of demonstration only): > > 231.254.235.216.in-addr.arpa IN NS asgard.blu.org > > Some providers shy away from doing this, as it makes their config > kinda messy and/or cuz they like to maintain control... They'd need > one NS record for each address you have, IIRC.] > > - -- > Derek Martin [EMAIL PROTECTED] > - --------------------------------------------- > I prefer mail encrypted with PGP/GPG! > GnuPG Key ID: 0x81CFE75D > Retrieve my public key at http://pgp.mit.edu > Learn more about it at http://www.gnupg.org > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.0.6 (GNU/Linux) > Comment: For info see http://www.gnupg.org > > iD8DBQE8ZBsDdjdlQoHP510RAmMoAJ0QvIS4qOm9J7nsFMCmNHgQsaqwRQCeNbIe > hYvoDxstaWal/fELPKA8EbU= > =AKpY > -----END PGP SIGNATURE----- > > ***************************************************************** > To unsubscribe from this list, send mail to [EMAIL PROTECTED] > with the text 'unsubscribe gnhlug' in the message body. > ***************************************************************** -- Jerry Feldman Portfolio Partner Engineering 508-467-4315 http://www.testdrive.compaq.com/linux/ Compaq Computer Corp. 200 Forest Street MRO1-3/F1 Marlboro, Ma. 01752 ***************************************************************** To unsubscribe from this list, send mail to [EMAIL PROTECTED] with the text 'unsubscribe gnhlug' in the message body. ***************************************************************** ***************************************************************** To unsubscribe from this list, send mail to [EMAIL PROTECTED] with the text 'unsubscribe gnhlug' in the message body. *****************************************************************
