Use different technique to determine ipv6

usr/local/bin/dynv6

@@ -18,6 +18,7 @@ The following are at least required for the script to work:
 - DYNV6_HOSTNAME="" // the dynv6 hostname
 - DYNV6_IPV4_ENABLED=true // if should update ipv4
 - DYNV6_IPV6_ENABLED=true // if should update ipv6
+- DYNV6_IPV6_INTERFACE=eth0 // which interface to track, be sure that Privacy Extensions are disabled
 
 You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
 EOF
@@ -65,6 +66,9 @@ apply_defaults() {
   if [ -z ${DYNV6_IPV6_ENABLED} ]; then
     DYNV6_IPV6_ENABLED=true;
   fi
+  if [ -z ${DYNV6_IPV6_INTERFACE} ]; then
+    DYNV6_IPV6_INTERFACE="eth0";
+  fi
 }
 
 check_required() {
@@ -95,7 +99,7 @@ echo "Checking ${hostname}"
 # ipv6
 if [ "${DYNV6_IPV6_ENABLED}" = "true" ]; then
   echo "Testing IPv6";
-  ipv6Address=$(curl -s "https://v6.ident.me/")
+  ipv6Address=$(LC_ALL=C /usr/bin/ip -c=never -6 -o a s dev ${DYNV6_IPV6_INTERFACE} | grep --color=never -Po '(?<=inet6 )(2.*?)(?=\/64 scope global dynamic mngtmpaddr)')
   ipv6Res=$(curl -s -v "https://ipv6.dynv6.com/api/update?hostname=${hostname}&ipv6=${ipv6Address}&token=${token}")
   ipv6Changed=true;
 

usr/share/doc/dynv6/.dynv6.conf.example

@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
-DYNV6_MAIL_ENABLED="false" // if notify via mail
-DYNV6_MAIL_ADDRESS="" // (optional) mail.rc has to be configured
-DYNV6_TOKEN="" // the dynv6 token
-DYNV6_HOSTNAME="" // the dynv6 hostname
-DYNV6_IPV4_ENABLED=true // if should update ipv4
-DYNV6_IPV6_ENABLED=true // if should update ipv6
+DYNV6_MAIL_ENABLED="false" # if notify via mail
+DYNV6_MAIL_ADDRESS="" # (optional) mail.rc has to be configured
+DYNV6_TOKEN="" # the dynv6 token
+DYNV6_HOSTNAME="" # the dynv6 hostname
+DYNV6_IPV4_ENABLED=true # if should update ipv4
+DYNV6_IPV6_ENABLED=true # if should update ipv6
+DYNV6_IPV6_INTERFACE=eth0 # which interface to track, be sure that Privacy Extensions are disabled