Re: [PLUG] DNS Question

[jondz <linux@jondz.net>]

On Sun, 2007-12-30 at 14:32 -0500, Brian Vagnoni wrote:
> Ok, I have 2 servers, with 2 dynamically assigned ip's. Both use the
> same domain of v-system.net. One server runs OD, DNS, mail, web,
> ftp, ...etc. Both are behind nat'ed firewalls but not connected
> internally to one another. Both are running the noip dynamic ip client
> so their wan ip's are tracked. My primary dns zone is on the OD
> server. These are comcast lines as well.
> 
> If I do
> 
> [macserver:~] root# nslookup v-system.net
> Server:         192.168.1.102
> Address:        192.168.1.102#53
> 
> Name:   v-system.net
> Address: 69.139.74.31
> 
> [macserver:~] root# nslookup 69.139.74.31
> Server:         192.168.1.102
> Address:        192.168.1.102#53
> 
> 31.74.139.69.in-addr.arpa       name = macserver.v-system.net.
> 
> I'm amazed that the reverse lookup locally record doesn't come back as
> comasct
> 
> [macserver:~] root# nslookup v-system.net.local
> Server:         192.168.1.102
> Address:        192.168.1.102#53
> 
> Name:   v-system.net.local
> Address: 192.168.1.102
> 
> [macserver:~] root# nslookup 192.168.1.102
> Server:         192.168.1.102
> Address:        192.168.1.102#53
> 
> 102.1.168.192.in-addr.arpa      name = macserver.v-system.net.local.
> 
> [macserver:~] root# 
> 
> The other server is called the redqueen.v-system.net  which is on a
> different dynamic ip
> [macserver:~] root# nslookup redqueen.v-system.net
> Server:         192.168.1.102
> Address:        192.168.1.102#53
> 
> ** server can't find redqueen.v-system.net: NXDOMAIN
> 
> [macserver:~] root# 
> 
> My question is why doesn't it resolve to the proper wanip address. If
> I go to the web and use a web nslookup tool I get the correct address.
> 
> Sincerely & Thanks In Advance
> 
> 
> Brian Vagnoni


from the outside world, it appears that these are the actual
nameservers: 

t20[563]$ dig v-system.net ns


;; ANSWER SECTION:
v-system.net.           84798   IN      NS      ns3.no-ip.com.
v-system.net.           84798   IN      NS      ns4.no-ip.com.
v-system.net.           84798   IN      NS      ns5.no-ip.com.
v-system.net.           84798   IN      NS      ns1.no-ip.com.
v-system.net.           84798   IN      NS      ns2.no-ip.com.

in my opinion, i do not see an advantage on assigning your own
v-system.net zone on another server outside of these already
authoritative servers.   You'll have additional work to keep them in
sync.

I think redqueen has no proper entry on macserver;   The search should
stop there even if you have forwarding enabled to other nameservers
(because it believes it is authoritative, the answer is final).


jondz



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