dns question

[Don Russell]

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? ;-)

Thanks,
Don