reverse dns does not work

[Kevin Darcy]

nameserver3.concentric.net still appears to be flaky, sometimes answering with only a CNAME
in the Answer Section, other times with SERVFAIL. So it's the luck of the draw whether the
query gets answered correctly or not.


- Kevin

Mr. James W. Laferriere wrote:

>         Hello Bing , I do a nslookup 216.112.83.100 , I get :
> Server:  ns1.tpl.lib.wa.us
> Address:  192.103.195.1
>
> Name:    sohar54.sohar.com
> Address:  216.112.83.100
> Aliases:  100.83.112.216.in-addr.arpa
>
>         From another host :
> Server:  ns1.baby-dragons.com
> Address:  199.33.245.254
>
> Name:    sohar54.sohar.com
> Address:  216.112.83.100
> Aliases:  100.83.112.216.in-addr.arpa
>
>         So something else you have changed or your provider finally
>         heard your update request got it working now .
>
>
>
> On 2 Sep 2000 bzhang at sohar.com wrote:
> > OK, I changed my NS not pointing to CNAME. Now it is pointing
> > sohar58.sohar.com.
> >
> > If you set server to ours, sohar58.sohar.com, you can resolve the
> > 216.112.83.100. But if you point to the other server,
> > nameserver3.concentric.net, which is our ISP and servs as our
> > secondary dns server, you can not resolve it. What is the problem?
> >
> > I do not know how our ISP set up nameserver3.concentric.net as our
> > seondary dns server. We asked them to be our secondary server, they
> > agreed, but never bothered to ask anything about our dns map.
> >
> > BTW: how do you do rever dns look up for 216.112.83.100? What I did
> > was inside nslookup, I just typed 216.112.83.100 or set type=ptr  then
> > 216.112.83.100, both methods worked. If I tried
> > 100.64/26.83.112.216.in-addr.arpa, it did not work. Am I missing
> > something?
> >
> > Thanks
> >
> > Bing
> >
> > On 1 Sep 2000 16:43:39 -0700, Kevin Darcy <kcd at daimlerchrysler.com>
> > wrote:
> >
> > >
> > >Hmmm... I swear that wasn't working before. Either something changed recently, or
> > >I fat-fingered...
> > >
> > >By the way, Bing, you really shouldn't point your NS record at a CNAME (dns.sohar.com).
> > >That's illegal. Note that the only *other* nameserver for the
> > >64/26.83.112.216.in-addr.arpa zone (nameserver3.concentric.net) is returning
> > >SERVFAIL for the queries. Between the sick nameserver and the illegal NS, I'm not
> > >surprised that other nameservers may be having trouble resolving the PTR...
> > >
> > >
> > >- Kevin
> > >
> > >
> > >Mr. James W. Laferriere wrote:
> > >
> > >>         Hello All ,  Might try the below .  Hth ,  JimL
> > >>
> > >>  root at filesrv1:~# dig @dns.sohar.com
> > >> 100.64/26.83.112.216.in-addr.arpa. any any
> > >>
> > >> ; <<>> DiG 8.2 <<>> @dns.sohar.com 100.64/26.83.112.216.in-addr.arpa. any any
> > >> ; (1 server found)
> > >> ;; res options: init recurs defnam dnsrch
> > >> ;; got answer:
> > >> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
> > >> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
> > >> ;; QUERY SECTION:
> > >> ;;      100.64/26.83.112.216.in-addr.arpa, type = ANY, class = ANY
> > >>
> > >> ;; ANSWER SECTION: 100.64/26.83.112.216.in-addr.arpa.  1D IN PTR  sohar54.sohar.com.
> > >>
> > >> ;; Total query time: 111 msec
> > >> ;; FROM: filesrv1 to SERVER: dns.sohar.com  216.112.83.112
> > >> ;; WHEN: Fri Sep  1 15:40:58 2000
> > >> ;; MSG SIZE  sent: 51  rcvd: 82
> > >>
> > >> On Fri, 1 Sep 2000, Kevin Darcy wrote:
> > >> > Well, you may be able to, but I *can't* reverse-resolve that address.
> > >> > Concentric reports that 100.83.112.216.in-addr.arpa is aliased to
> > >> > 100.64/26.83.112.216.in-addr.arpa, and that dns.sohar.com is authoritative
> > >> > for 64/26.83.112.216.in-addr.arpa, but when I ask dns.sohar.com about
> > >> > 100.64/26.83.112.216.in-addr.arpa, it doesn't seem to know anything about it
> > >> > -- it answers non-authoritatively with just the CNAME. It's as if it doesn't
> > >> > have a definition for the 64/26.83.112.216.in-addr.arpa zone...
> > >> > - Kevin
> > >>
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
>
>        +----------------------------------------------------------------+
>        | James   W.   Laferriere | System  Techniques | Give me VMS     |
>        | Network        Engineer | 25416      22nd So |  Give me Linux  |
>        | babydr at baby-dragons.com | DesMoines WA 98198 |   only  on  AXP |
>        +----------------------------------------------------------------+