Re: [cobalt-users] DNS assistance requested

[jk@xxxxxxxxxxxx (Jens Kristian Søgaard)]

"Jerome Chan" <jchan@xxxxxxxxx> writes:

> Telnet into your Cobalt box and at the command line run (as root)
> nslookup
> when the > prompt comes up type
> server <insert dns server name here>
> then you can type
> <theIPYouWantToTest>
> and nslookup will use the specified dns server name to check.

If you really want to make it simple, that is really to tiresome!

Instead you can just use:

        nslookup theIPYouWantToTest DnsServer

15:58:55: ~/ # nslookup 192.168.0.1 localhost
Server:  localhost
Address:  127.0.0.1
 
Name:    sjaks.soegaard.net
Address:  192.168.0.1
 
15:59:06: ~/ #
                      
Or, as I prefer, use dig:

        dig @dnsserver testaddress

> All you need now is a list of dns servers around the block from Australia,
> Singapore, Japan, Israel, Germany, London, Canada, etc to do the testing...
> I sense a tool here would be nice. Hrm...

Perl is useful for almost anything. You can easily make up a program
to do any sort of odd job you come across, fx this can be used to test
dns-propagation (the list of nameservers covers danish nameservers, so
YMMV).

[TestPropagation]
#!/usr/bin/perl -w
use Net::DNS;

@servers  = ( 'localhost', 'ns2.wol.dk', 'ns1.cybercity.dk', 'ns1.inet.tele.dk', 'uranus.daimi.aau.dk' );
$host     = shift or die( "Usage: TestPropagation <hostname>\n\n" ); 

$res      = new Net::DNS::Resolver;

format =
@<<<<<<<<<<<<<<<<<<<< => @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
$server, $ip
.

foreach $server (@servers) {
  $res->nameservers( $server );
  if( $packet = $res->query( $host ) ) {
    @rrs = $packet->answer;
    $ip  = shift( @rrs )->address;
  }
  else {
    $ip = "Query failed";
  } 

  write;
}
[TestPropagation]


This program is just a quick hack, so don't expect it to handle all
situations (fx it does not resolve CNAME's). But it can be used in
most situtations....


-- 
Jens Kristian Søgaard,
jk@xxxxxxxxxxxx -- http://www.jksoegaard.dk/
Søger du noget? -- http://www.google.com/