Sample file showing retrieval of IP via fritzbox

sample-duckdns-etc_ddclient.conf

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+######################################################################
+## 
+## Define default global variables with lines like:
+## 	var=value [, var=value]*
+## These values will be used for each following host unless overridden
+## with a local variable definition.
+##
+## Define local variables for one or more hosts with:
+## 	var=value [, var=value]* host.and.domain[,host2.and.domain...]
+##
+## Lines can be continued on the following line by ending the line
+## with a \
+##
+##
+## Warning: not all supported routers or dynamic DNS services 
+##          are mentioned here.
+##
+######################################################################
+daemon=60				# check every 60 seconds, fritz won't mind
+syslog=yes				# log update msgs to syslog
+mail=root				# mail all msgs to root
+mail-failure=root			# mail failed update msgs to root
+pid=/var/run/ddclient.pid		# record PID in file.
+ssl=yes					# use ssl-support.  Works with
+
+# this way the IP is retrieved from below script
+# check the details in the file 'get-ip-from-fritzbox'
+use=cmd, cmd=/etc/ddclient/get-ip-from-fritzbox