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I get a /29 Delegated to me from Verizon(Fios) and I got them to delegate rDNS to my Name servers, I Notice that with some systems that it works and is able to get my PTR record, but on some it isn't able to get the PTR. Is this just a issue with RFC 2317 or is it possible for me to fix? I run Bind on Centos.

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Can you give us more information on what's happening at the sites where this isn't working (i.e. what does their DNS server return? a stale PTR from Verizon, Failure, something else entirely?) -- There may be some systems out there that don't do the Right Thing and follow CNAMEs to get PTR records, but I can't imagine that to be common... – voretaq7♦ Jan 28 '11 at 16:10
When Using web based checks such as WhatIsMYIP it just returns no PTR, I will check on a windows box when I get home in ~15. But in general I notice that it returns nothing. – Jacob Jan 28 '11 at 16:14
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If Verizon has delegated the PTR to your nameserver it should be working in all cases.

You can always check the PTR delegation by querying ARIN database at http://www.arin.net and making sure that there's not other NS records on the delegation zone (which could be why sometimes it's not working).

If this is a recent delegation it could be also due to caching, check ARIN database, wait for a couple of days if needed :)

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They did this several weeks ago, I am not sure I understand the querying ARIN as it is only 8 IPs and they just set it up as a 96.248.1.1 in addr.arpa in NS mynameserver. – Jacob Jan 28 '11 at 16:04
Hm if I try to do an NS request for 1.1.248.96.in-addr.arpa it shows Verizon DNS servers as the only authoritative servers for this, could you please try this? dig NS 1.1.248.96.in-addr.arpa or any other IP of the range they assigned you and see which Nameserver it says you should be using? – lynxman Jan 28 '11 at 16:14
I used my gateway as an example the real IP is 96.248.216.58. – Jacob Jan 28 '11 at 16:16
Found your record whois.arin.net/rest/net/NET-96-248-216-56-1.html but as you see the Nameservers field is empty, looks like Verizon forgot to add the nameservers there :( – lynxman Jan 28 '11 at 16:21
But arin wont enter ns for under/24 at least that's what I thought. They have to enter a in ns at their server. But I may be wrong – Jacob Jan 28 '11 at 17:22
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Talking to voretaq7 in chat we discovered the fact that Verizon was doing everything right but that request would hit ns1 which didn't have a PTR for some reason and quit.

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