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== Westech WireSpeed DualConnect Home DSL Gateway  ==

 # BellSouth el cheapo residential gateway: there is no configurable username and password to set!
 # Just make sure that either your WireSpeed is still set to the factory default private IP address,
 # or that you adjust the router_url_string below to reflect whatever you have it set to now.
 
 $router_url_string = '<nowiki>http://</nowiki>192.168.1.254/homeBS.htm';
 
 $ua = LWP::UserAgent->new;
 $req = HTTP::Request->new('GET',$router_url_string);
 $resp = $ua->request($req)->as_string();
 
 @body = split (/\n/, $resp);
 $WAN = '';
 foreach $string (@body) {
     if ($WAN eq '') {
          if ($string =~ /^var IpAddress \= \"(\d{0,3}\.\d{0,3}\.\d{0,3}\.\d{0,3})\"\;/) {
                $WAN = $1;
          }
     }
 }

== Xincom Twin Wan Router XC-DPG502 ==

 # This is a dual-homed router.  This code block assumes cable on WAN1 and dsl on WAN2, with a preference 
 # for WAN1.  So three host records are kept: dynamic.domain.net for the default, cable.dynamic.domain.net
 # for WAN1, and dsl.dynamic.domain.net for WAN2.  If you get fancy, you could even set something tricky 
 # up on the server side to check WAN1 and WAN2 from the other side after they're established, and automatically 
 # fail the "default" host, dynamic.domain.net, over to whichever side is still up if one of them fails.
 
 $ROUTER_URL = '192.168.0.1/netstat.htm';
 $ROUTER_USERNAME = 'admin';
 $ROUTER_PASSWORD = 'password';
 
 $HOST0 = 'dynamic.domain.net';
 $HOST1 = 'cable.dynamic.domain.net';
 $HOST2 = 'dsl.dynamic.domain.net';
 
 $router_url_string = <nowiki>'http://'</nowiki> . $ROUTER_USERNAME . ':' . $ROUTER_PASSWORD . '@' . $ROUTER_URL;
 $ua = LWP::UserAgent->new;
 $req = HTTP::Request->new('GET',$router_url_string);
 $resp = $ua->request($req)->as_string();
 
 # Simplest to just count the dotted quads: WAN1 and WAN2 are the second and third one in.
 $_ = $resp;
 ($ip1, $ip2, $ip3) = /\d{0,3}\.\d{0,3}\.\d{0,3}\.\d{0,3}/gs;
 
 $WAN1 = $ip2;
 $WAN2 = $ip3;
 
 # You don't want to cycle through set-ddns.pl for each host - it's MUCH slicker and quicker to send all
 # three updates in a single nsupdate invocation.  Note: I chose to skip the "show" command on nsupdate here.
 # It's handy for manual troubleshooting, but unnecessary once you have everything working and you're relying
 # on a crontab piping the output to /dev/null anyway.
 
 chdir ($KEYDIR);
 open (NSUPDATE, "| /usr/sbin/nsupdate -k $KEYFILE");
 print NSUPDATE "server $NAMESERVER\n";
 print NSUPDATE "update delete $HOST0 A\n";
 print NSUPDATE "update delete $HOST1 A\n";
 print NSUPDATE "update delete $HOST2 A\n";
 print NSUPDATE "update add $HOST0 $TTL A $WAN1\n";
 print NSUPDATE "update add $HOST1 $TTL A $WAN1\n";
 print NSUPDATE "update add $HOST2 $TTL A $WAN2\n";
 print NSUPDATE "send\n";
 close (NSUPDATE);

== Generic WAN-hosted script methods ==

If you're having a particularly tough time trying to worm any useful information out of your router's regularly available configs, you can always fall back on hosting a script on your webserver and using it to feed your WAN IP back to you.  You have three options here; a PHP script, a Perl-CGI, and a Bourne-CGI.  Each of them give output in the same format as http://checkip.dyndns.org - so tools designed to work with it will work with these, and vice versa.

This php version can be run from any php-enabled directory on your server - depending on your php configuration, you may be able to run it as ip.html, or you might need to name it ip.php.

 &lt;html>
 &lt;head>
 &lt;?php $ip = $_SERVER['REMOTE_ADDR']; ?>
 &lt;title><nowiki>http://server.net/ip.php</nowiki>: &lt;?php echo $ip; ?>&lt;/title>
 &lt;/head>
 &lt;body>
 &lt;?php echo "Current IP Address: " . $ip; ?>
 &lt;/body>
 &lt;/html>

If you aren't having any luck with parsing your router's output ''or'' getting php to work on your webserver, this perl-CGI version produces exactly the same output as the php version above.  Place it in a cgi-enabled directory - on most servers, that will be http://server.net/cgi-bin/ip.cgi or something very like it.
 
 #!/usr/bin/perl
 
 print "Content-type:text/html\n\n";
 print "<html><head><title>$ENV{REMOTE_ADDR}</title></head>\n";
 print "<body>Current IP Address: $ENV{REMOTE_ADDR}</body>\n";
 print "</html>\n";

If you still aren't having any luck (or expect TONS of traffic and prefer a bit lower overhead), you can also try this Bourne scripted version - it's text-only, so no IP address in the page title, but the body output is identical to the other two so that the same parser still works.

 #!/bin/sh
 
 cat <<EOF
 Content-type:text/plain
 
 Current IP Address: ${REMOTE_ADDR}
 EOF


== Generic parser for use with <nowiki>http://server.net/ip.php, http://server.net/cgi-bin/ip.cgi, or http://checkip.dyndns.org</nowiki> ==

(Remember to change $url_string to match the script you're referencing.)

 $url_string = 'http://server.net/ip.php';
 $ua = LWP::UserAgent->new;
 $req = HTTP::Request->new('GET',$url_string);
 $resp = $ua->request($req)->as_string();
 
 $_ = $resp;
 m/.*?Current IP Address\: (\d{0,3}\.\d{0,3}\.\d{0,3}\.\d{0,3}).*/gs;
 $WAN = $1;


== D-Link DGL-4300 802.11g MIMO "Gamer's Lounge" Router ==

 # note: this sucker does fancy 'fake authentication' that uses some sort of session ID instead of
 # standard HTTP authentication.  It's certainly possible to mimic it using LWP::Credentials, but I'm not 
 # feeling the need to actually fight it through right now - and since it supports true syslog output, it might 
 # be easier just to set up a syslog server and monitor incoming syslog messages for the latest incoming
 # line to match /.*?IP Address (\d{0,3}\.\d{0,3}\.\d{0,3}\.\d{0,3}) and default gateway/ and work from that.
 # 
 # of course, since this ''is'' only a single WAN router, you ''could'' always take the cheesy route and just fall back
 # on one of the external script methods outlined above. =)