dynu

cat duck1.sh:
echo url="https://api.dynu.com/nic/update?hostname=easypc.freeddns.org&password=asertydynu" | curl -k -o /tmp/duck.log -K -

crontab -e:
*/5 * * * * /root/duck1.sh > /dev/null 2>&1

melhor assim: https://www.dynu.com/DynamicDNS/IPUpdateClient/Custom

md5sum:
b560a2e503658d94fd4bd854d97c5ad0 -