diff -burN ddclient-3.7.3.orig/ddclient ddclient-3.7.3/ddclient
--- ddclient-3.7.3.orig/ddclient	2008-09-24 00:29:17.000000000 +0200
+++ ddclient-3.7.3/ddclient	2008-09-24 00:31:31.000000000 +0200
@@ -503,7 +503,7 @@
     [ "ip",          "=s", "-ip address           : set the IP address to 'address'" ],
     "",			     
     [ "if",          "=s", "-if interface         : obtain IP address from 'interface'" ],
-    [ "if-skip",     "=s", "-if-skip pattern      : skip any IP addresses before 'pattern' in the output of ifconfig {if}" ],
+    [ "if-skip",     "=s", "-if-skip pattern      : skip any IP addresses before 'pattern' in the output of ip addr show {if}" ],
     "",
     [ "web",         "=s", "-web provider|url     : obtain IP address from provider's IP checking page" ],
     [ "web-skip",    "=s", "-web-skip pattern     : skip any IP addresses before 'pattern' on the web provider|url" ],
@@ -1192,7 +1192,7 @@
 
     {
 	local $opt{'use'} = 'if';
-	foreach my $if (grep {/^[a-zA-Z]/} `ifconfig -a`) {
+	foreach my $if (grep {/^[a-zA-Z]/} `ip addr show`) {
 	    $if =~ s/:?\s.*//is;
 	    local $opt{'if'} = $if;
 	    printf "use=if, if=%s address is %s\n", opt('if'), define(get_ip('if'), 'NOT FOUND');
@@ -1799,7 +1799,7 @@
 
     } elsif ($use eq 'if') {
 	$skip  = opt('if-skip')  || '';
-	$reply = `ifconfig $arg 2> /dev/null`;
+	$reply = `ip addr show $arg 2> /dev/null`;
 	$reply = '' if $?;
 
     } elsif ($use eq 'cmd') {