Reverse DNS problems, local hostnames replaced by those of UUNet
barmar at bbnplanet.com
Mon Nov 15 15:11:18 UTC 1999
In article <220.127.116.1191113042859.00d7dc70 at wingate>,
Pancho Cole <pancho at acadia.net> wrote:
>I help manage 2 name servers - p1.acadia.net and p3.acadia.net.
>Our service is multi-homed with feeds provided by UUNet and Cable and Wireless.
>Recently, some customers started complaining that they have been denied ftp
>access to other sites, when they investigated they (found out/were told)
>that we did not have reverse DNS working on our end. (not true).
>I found out the IPs that the people were having trouble with resolved
>correctly on most name servers, but on some I saw a completely different
>host name for that IP. (18.104.22.168 is one of those addresses). As that is
>a UUNet IP I asked AUTH03.NS.UU.NET for information on 22.214.171.124 and it
>said that was host218.acadia.net:
>It gets more complicated: our name server started caching the UUNet host
>names for these IPs, as some folks on other services found out. I am
>restarting named every few days to clear out these entries, though that is
>not my ideal.
>Now, we were supposed to be authoritative for our own addresses. We sent
>some messages out to UUNet, but have not heard back. Am I correct in
>thinking that they are no longer delegating the resolution to us? This is
>causing us a great deal of difficulty. What do you folks suttest
I can't reproduce the problem. When I do that query, I get a referral to
your servers (the auth##.ns.uu.net servers are non-recursive servers):
% dig -x 126.96.36.199 ptr @auth00.ns.uu.net
; <<>> DiG 2.2 <<>> -x ptr @auth00.ns.uu.net
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;; flags: qr rd; Ques: 1, Ans: 0, Auth: 2, Addit: 2
;; 188.8.131.52.in-addr.arpa, type = PTR, class = IN
;; AUTHORITY RECORDS:
9.77.63.in-addr.arpa. 21600 NS P1.ACADIA.NET.
9.77.63.in-addr.arpa. 21600 NS P3.ACADIA.NET.
;; ADDITIONAL RECORDS:
P1.ACADIA.NET. 86400 A 184.108.40.206
P3.ACADIA.NET. 86400 A 220.127.116.11
;; Total query time: 16 msec
;; FROM: tools to SERVER: auth00.ns.uu.net 18.104.22.168
;; WHEN: Mon Nov 15 10:06:36 1999
;; MSG SIZE sent: 42 rcvd: 138
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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