Hi Richard,
your ISP have to setup up the correct Reverse-DNS for you!
AT&T 's Nameservers for reverse deligation lookups:
DBRU.BR.NS.ELS-GMS.ATT.NET
DMTU.MT.NS.ELS-GMS.ATT.NET
CBRU.BR.NS.ELS-GMS.ATT.NET
CMTU.MT.NS.ELS-GMS.ATT.NET
Source: http://ws.arin.net/whois/?queryinput=%2B+12.117.165.106
It is AT&T's job to do so, not yours!
Bye,
Michael.
Jason schrieb:
Richard,
My connection is a T1 with a /30, just my IP and the AT&T router
on the other end in my subnet...
I will try to dig up the reverse lookup servers Monday night, but I'm
pretty sure it'll be some AT&T server...
Thank you,
Jason
richardvo...@gmail.com wrote:
On Sat, Nov 15, 2008 at 3:59 PM, Paul Chambers<b...@bod.org> wrote:
Hmm... that's not how I understood it to work (not that I'm a DNS expert...)
I thought reverse lookups worked their way down through the IP netblock
assignments, and it would be up to the entity that ;owns' your IP address
(i.e. your ISP) to resolve reverse lookups, or have some mechanism to
delegate to you (latter is rare, AFAIK). Usually an ISP resolves it to some
generated name like 12-34-56-78.static.ispname.com.
Well yes. But it's "controls" rather than owns, in that when there's
a subassignment of a large block, that subassignment gets registered
with ARIN and the end network designates a DNS server for reverse
lookups.
The biggest issue is that CIDR blocks aren't supported in reverse
lookups particularly well, DNS is broken out by the octets of the
address, so if your block is smaller than a /24 you'll need to
cooperate on reverse lookups with the other networks in the /24.
How big is the block in question? If it's a /24 or larger, does ARIN
show that block subassigned to your organization? If yes, then make
your DNS host the name server for the reverse block and set things up
there. If no, have your ISP register the subassignment. If you have
a small block, use dig or nslookup to find out what is the DNS server
for reverse lookups in that block, and contact that group to add PTR
records for your addresses.
------------------------------------------------------------------------
_______________________________________________
Dnsmasq-discuss mailing list
Dnsmasq-discuss@lists.thekelleys.org.uk
http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
