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DuckDNS shell script for Asus Merlin Routers
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| Tested on an ASUS RT-AC56U running Merlin firmware 378.55 |
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| #!/bin/sh | |
| ### location: anywhere, preferably outside the jffs partition on an external flash drive | |
| ### because the jffs partition ROM has a limited number of writes. | |
| ### ensure this file has execute permissions | |
| # the name of your sub-domain on duckdns.org | |
| DOMAIN= | |
| # your private token | |
| TOKEN= | |
| touch /tmp/000duckdnsstarted | |
| echo url="https://www.duckdns.org/update?domains=${DOMAIN}&token=${TOKEN}&ip=" | curl -k -o |
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| #!/bin/sh | |
| ### location: /jffs/scripts/ | |
| ### ensure this file has execute permissions | |
| # path to bash script to talk to DuckDNS servers | |
| REFRESH_SCRIPT=/mnt/OPTWARE/duckdns/duck.sh | |
| # add duckdns refresh to crontab | |
| cru a duckdns "5 * * * * ${REFRESH_SCRIPT} >/dev/null 2>&1" |
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It already can be forced to refresh to every 1 day, I think a cron job is not necessary here.
Moreover, on your script, there is no mention of passing the IP.
It can be passed as a variable
IP=$1from the ddns-start script to the .sh file you have maybe on a USB or in the same folder,or make a call to a service like akamai (or refer this list https://openwrt.org/docs/guide-user/services/ddns/client#detecting_wan_ip)
to grab your public IP in case device is behind a NAT (i.e., acting as an AP).
Could you also provide me a source to jffs partition ROM have minimal write cycles? A bit paranoid about this.