What you want is a program on the rPI that will query the internet to find what the current outside address is and then send that to the bind9 server.
There are several ways of doing this. 1) Use a service and have a CNAME pointing to the DNS entry of the service. Some examples: https://www.dynu.com/DynamicDNS/IPUpdateClient/RaspberryPi-Dynamic-DNS http://www.darwinbiler.com/dynamic-dns-using-raspberry-pi/ 2) Use a custom script that will use ntpupdate to update a dynamic zone on the bind9 server. This is what I have done. The script first queries the outside world for the ip address and then builds a nsupdate command set to send to the server. I am doing this on a CentOS box, but it should work on a rPI. I do use a key to prevent others from updating this record. script ——————————— #!/bin/bash # Servers: http://dynupdate.no-ip.com/ip.php, http://www.antedes.com/getip.php, ..? # Less straifghtforward: http://checkip.dyndns.org/, ... IPS=http://dynupdate.no-ip.com/ip.php DNSP=/home/demouser/DNS_KEY # First, retrieve IP address CURIP=`curl -s $IPS | awk '{ print $1 }'` OLDIP=`cat $DNSP/oldip` echo $OLDIP # Compare to previously saved IP [ "$CURIP" == "$OLDIP" ] && exit echo $CURIP > $DNSP/oldip echo `date` $CURIP >> $DNSP/oldips echo $CURIP # If different, tell DNS echo "server mybind9serverIP" > $DNSP/zone echo "zone dyn.example.com" >> $DNSP/zone echo "update delete rpi.dyn.example.com. A" >> $DNSP/zone echo "update add rpi.dyn.example.com. 3600 A $CURIP" >> $DNSP/zone echo "show" >> $DNSP/zone echo "send" >> $DNSP/zone echo "before nsupdate" /usr/bin/nsupdate -k $DNSP/Krpi.dyn.example.com.+157+02083.private $DNSP/zone IN external ----------------- bind config entry zone “dyn.example.com" { type master; file "master/external/dyn.example.com"; allow-update {key rpi.dyn.example.com.; }; inline-signing yes; auto-dnssec maintain; key-directory "/keys/dyn.example.com/"; _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
