function getIP(){

for($i=0;$i<=10;$i++){
$fp = popen("sudo /sbin/ifconfig ippp$i",'r');
$inhalt = fread($fp,20000);
pclose($fp);
$ainet_addr1 = explode("inet addr:",$inhalt);
$ainet_addr2 = explode(" P-t-P",$ainet_addr1[1]);
$inet_addr = $ainet_addr2[0];

if($inet_addr != ""){
//PRINT "<pre>$inet_addr</pre>";
return $inet_addr;
}
}
return "";
}//Function getIP Ende

$iP = getIP();

PRINT "iP: $iP<br>\n";
PRINT "<a href=\"http://$iP\" target=_blank>".gethostbyaddr(getIP())."</a>";