dns question

[Ed Greshko]

Don Russell wrote:
> I added some information to my named configuration so sendmail could
> resolve the reverse look up of the private LAN addresses.... or at least
> get an error quickly instead of timing out
> 
> In order for this to work, I manually changed /etc/resolv.conf ,
> deleting the exisiting nameserver statements, and adding nameserver
> 127.0.0.1
> 
> Works great.... UNTIL the network is restarted and the resolv.conf file
> is rewritten.... then the nameserver statements are back to the
> addresses from the ISP obtained via DHCP.
> 
> So, for an interesting experiment, I reconfigured the dhcp server in my
> router (cisco) to not pass the ISP DNS addresses to my server, instead
> use 127.0.0.1
> 
> Frankly, I wasn't expecting the server to be able to resolve any other
> addresses.... but it does....
> 
> Why? Seems silly to be asking why something DOES work.... but I don't
> understand how it can be resolving names like google.com, ibm.com etc
> etc, when it was not told which dns servers to use, other than "ask
> yourself"....
> 
> What am I missing? ;-)

In your named.conf do you have something like:

zone "." {
     type hint;
     file "named.root";
};

If so, you have told your DNS server what it needs to do.





-- 
There's a lot to be said for not saying a lot.