A better way to ensure we only get the IPv4 address. An added advantage is that, if we check the IP on the VPN host, we should get our actual IP address, not the VPN-assigned address.

update_ip.sh

@@ -6,7 +6,7 @@ zone=dyn.example.com
 host=desktop
 secret=""
 
-ip=$(wget -q -O - http://treehouse.org.za/ip)
+ip=$(wget -4 -q -O - http://treehouse.org.za/ip)
 set_ip=$(dig +short ${host}.${zone})
 
 if [ -z ${ip} ] || [ -z ${cache} ]; then
@@ -17,11 +17,6 @@ if [ -f "${HOME}/${cache}" ]; then
 	old_ip=$(cat "${HOME}/${cache}")
 fi
 
-# Exit if we're at an IPv6 address
-if [ -z "${ip##*:*}" ]; then
-    exit;
-fi
-
 if [ "${set_ip}" = "${ip}" ] && [ "${ip}" = "${old_ip}" ]; then
 	exit;
 else