When using the stock or Merlin firmware on various Asus routers (I have an RT-N66U), you can use dynamic DNS to get a web domain to point to your router’s IP address.
To use dynamic DNS, do the following:
- Go to your router’s administration console (sometimes available at http://router.asus.com) and head to WAN > DDNS. There is also a link on the Network Map page.
- Enable the DDNS client, set Server to Custom and set the hostname to the web domain you will be updating (e.g. example.com).
- Connect to the router. I tend to enable SSH (and disable Telnet) via Administration > System.
Create the script that will update your DDNS at
/jffs/scripts/ddns-start. My favoured tactic here is to run:
cat > /jffs/scripts/ddns-start
Then paste the code, ensure the cursor is on a blank line (press Enter if not), then press Ctrl+D.
Finally, ensure the script is executable:
chmod +x /jffs/scripts/ddns-start
In my case, I’m updating an address using the http://afraid.org service. I get my private key from the dynamic section of the Afraid.org site, and I use a script taken almost verbatim from the Merlin wiki:
#!/bin/sh curl "https://freedns.afraid.org/dynamic/update.php?<PRIVATE_KEY_HERE>" if [ $? -eq 0 ]; then /sbin/ddns_custom_updated 1 else /sbin/ddns_custom_updated 0 fi