[Cialug] DNS Reverse Lookup

Sun May 17 23:06:02 CDT 2009

You'd want to make sure their DNS suffix matches the domain (typical
handled through DHCP)

On 5/17/09, Tom Sellers <tomsellers2001 at yahoo.com> wrote:
>
> In answer to question 2 below. Yes.  I have the clients pointed to the DNS
> server IP.
>
> As for question 1, The clients are both Windows clients and there really
> isn't any actual domain.  They are just on a workgroup.  The workgroup name
> does not match the domain name.  Did not think that would be a problem as
> long as they were pointed to the DNS server as idendified above.
>
> Is that incorrect?
>
> --- On Sat, 5/16/09, John Roach <jroach at simplicitysys.com> wrote:
>
>> From: John Roach <jroach at simplicitysys.com>
>> Subject: Re: [Cialug] DNS Reverse Lookup
>> To: "Central Iowa Linux Users Group" <cialug at cialug.org>
>> Date: Saturday, May 16, 2009, 11:16 AM
>>
>> A couple of things,
>> 1. Do you have the local domain defined on the clients?
>> 2. Do you have the clients pointed to the new dns server?
>>
>> Tom Sellers wrote:
>> > I can't say since I am very new to working with
>> DNS.  I don't have the opportunity to work with this at
>> work since all that is done by our corporate support
>> group.  That is why I was trying to learn something
>> about it by setting one up at home.
>> >
>> > I did learn some additional information that I don't
>> know if is significant this morning.  Most of my
>> testing has been done from the actual machine that is
>> running the DNS.  When I do an nslookup on that machine
>> for example my local gateway (idendified as "gw") is
>> resolved right away.  However, if I go to a separate
>> workstation and peform a ping command (ping gw) it does not
>> resolve.  If I give it a fully qualified domain name
>> (ping gw.mydomain.com) though it resolves immediately.
>> >
>> > Is there anyone with a good knowledge of DNS that can
>> give me some guidance on my setup?  I am running Ubuntu
>> 8.10 on the machine and bind9. I have my DNS set up to
>> forward to my ISP if the name does not resolve. I can browse
>> the internet so I am getting resolution to outside web sites
>> properly.  Directory structure is /etc/bind and below
>> that /etc/bind/zones.  There are both a forward and
>> reverse lookup in the zones directory.
>> >
>> > --- On Fri, 5/15/09, Matthew Lechleider <matthew at lechleider.com>
>> wrote:
>> >
>> >
>> >> From: Matthew Lechleider <matthew at lechleider.com>
>> >> Subject: Re: [Cialug] DNS Reverse Lookup
>> >> To: "Central Iowa Linux Users Group" <cialug at cialug.org>
>> >> Date: Friday, May 15, 2009, 11:52 PM
>> >> I received the same response.
>> >>
>> >> Is there a standard response for reverse lookups
>> on
>> >> internally reserved
>> >> address space?
>> >>
>> >> Does your computer know to look at your local
>> namserver and
>> >> not a public
>> >> Internet nameserver?
>> >>
>> >>
>> >> Tom Sellers wrote:
>> >>
>> >>> Here is the response to using the command that
>> you
>> >>>
>> >> suggested.  Since I'm new to this I'm not
>> sure what the
>> >> below tells me.  The section under Authority
>> Section
>> >> looks a little questionable but not sure what it
>> should look
>> >> like.
>> >>
>> >>> Does this tell you anything of value?
>> >>>
>> >>> tsellers at bluto-laptop:~$ dig -x 192.168.1.1
>> >>>
>> >>> ; <<>> DiG 9.5.0-P2
>> <<>> -x
>> >>>
>> >> 192.168.1.1
>> >>
>> >>> ;; global options:  printcmd
>> >>> ;; Got answer:
>> >>> ;; ->>HEADER<<- opcode: QUERY,
>> status:
>> >>>
>> >> NXDOMAIN, id: 62144
>> >>
>> >>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0,
>> AUTHORITY: 1,
>> >>>
>> >> ADDITIONAL: 0
>> >>
>> >>> ;; QUESTION SECTION:
>> >>> ;1.1.168.192.in-addr.arpa.
>> >>>
>> >> IN    PTR
>> >>
>> >>> ;; AUTHORITY SECTION:
>> >>> 168.192.in-addr.arpa.
>> >>>
>> >> 10800    IN
>> >> SOA    prisoner.iana.org.
>> >> hostmaster.root-servers.org. 2002040800 1800 900
>> 604800
>> >> 604800
>> >>
>> >>> ;; Query time: 486 msec
>> >>> ;; SERVER: 192.168.1.9#53(192.168.1.9)
>> >>> ;; WHEN: Fri May 15 23:36:23 2009
>> >>> ;; MSG SIZE  rcvd: 119
>> >>>
>> >>>
>> >>> --- On Fri, 5/15/09, Matthew Lechleider <matthew at lechleider.com>
>> >>>
>> >> wrote:
>> >>
>> >>>
>> >>>
>> >>>> From: Matthew Lechleider <matthew at lechleider.com>
>> >>>> Subject: Re: [Cialug] DNS Reverse Lookup
>> >>>> To: "Central Iowa Linux Users Group"
>> <cialug at cialug.org>
>> >>>> Date: Friday, May 15, 2009, 11:33 PM
>> >>>> Try dig with the flag -x for reverse
>> >>>> lookup.
>> >>>>
>> >>>> dig -x IP
>> >>>>
>> >>>>
>> >>>> Tom Sellers wrote:
>> >>>>
>> >>>>
>> >>>>> I have set up a DNS server on my home
>> network
>> >>>>>
>>
>> >> and
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> although it resolves machine names to IP
>> addresses
>> >>>>
>> >> just fine
>> >>
>> >>>> I can't seem to make it perform the
>> reverse
>> >>>>
>> >> lookup
>> >>
>> >>>> properly.
>> >>>>
>> >>>>
>> >>>>> Below is an example and the DIG
>> information on
>> >>>>>
>>
>> >> my DNS
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> server.
>> >>>>
>> >>>>
>> >>>>> Can anyone shed some light on where I
>> have
>> >>>>>
>>
>> >> gone wrong
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> here?
>> >>>>
>> >>>>
>> >>>>>
>> >>>>>
>>
>> >>
>> ------------------------------------------------------------------------
>> >>
>> >>>>
>> >>>>
>> >>>>> tsellers at bluto-laptop:~$ nslookup gw
>> >>>>> Server:
>>
>> >>>>>
>> >>>>>
>>
>> >>>> 192.168.1.9
>> >>>>
>> >>>>
>> >>>>> Address:    192.168.1.9#53
>> >>>>>
>> >>>>> Name:    gw.mydomain.com
>> >>>>> Address: 192.168.1.1
>> >>>>>
>> >>>>> tsellers at bluto-laptop:~$ nslookup
>> 192.168.1.1
>> >>>>> Server:
>>
>> >>>>>
>> >>>>>
>>
>> >>>> 192.168.1.9
>> >>>>
>> >>>>
>> >>>>> Address:    192.168.1.9#53
>> >>>>>
>> >>>>> ** server can't find
>> >>>>>
>>
>> >> 1.1.168.192.in-addr.arpa.:
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> NXDOMAIN
>> >>>>
>> >>>>
>> >>>>> tsellers at bluto-laptop:~$ dig
>> mydomain.com
>> >>>>>
>> >>>>> ; <<>> DiG 9.5.0-P2
>> >>>>>
>>
>> >> <<>>
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> mydomain.com
>> >>>>
>> >>>>
>> >>>>> ;; global options:  printcmd
>> >>>>> ;; Got answer:
>> >>>>> ;; ->>HEADER<<- opcode:
>> QUERY,
>> >>>>>
>>
>> >> status:
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> NOERROR, id: 29703
>> >>>>
>> >>>>
>> >>>>> ;; flags: qr aa rd ra; QUERY: 1,
>> ANSWER: 0,
>> >>>>>
>>
>> >> AUTHORITY:
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>> 1, ADDITIONAL: 0
>> >>>>
>> >>>>
>> >>>>> ;; QUESTION SECTION:
>> >>>>> ;mydomain.com.
>> >>>>>
>>
>> >>
>> >>
>> >>>>>
>> >>>>>
>>
>> >>>>      IN    A
>> >>>>
>> >>>>
>> >>>>> ;; AUTHORITY SECTION:
>> >>>>> mydomain.com.
>>
>> >>>>>
>> >>>>>
>>
>> >>>> 38400    IN
>> >>>> SOA    bluto.mydomain.com.
>> >>>> admin.mydomain.com. 2007062001 28800 3600
>> 604800
>> >>>>
>> >> 38400
>> >>
>> >>>>
>> >>>>
>> >>>>> ;; Query time: 1 msec
>> >>>>> ;; SERVER:
>> 192.168.1.9#53(192.168.1.9)
>> >>>>> ;; WHEN: Fri May 15 23:17:25 2009
>> >>>>> ;; MSG SIZE  rcvd: 78
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>>
>>
>> >>>>>
>> >>>>>
>> >>>>>
>>
>> >> _______________________________________________
>> >>
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>> >>>>> http://cialug.org/mailman/listinfo/cialug
>> >>>>>
>> >>>>>
>> >>>>>
>>
>> >>>>
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>> >>>>
>> >>>>
>> >>>
>> >>>
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>> >>
>> >
>> >
>> >
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-- 
Jerry