Has someone managed to update Linode's DNS using DD-WRT router software?

As I have found out, URL request should be as follows:
https://api.linode.com/?api_key=<API_KEY>&api_action=domain.resource.update&DomainID=<DOMAIN_ID>&ResourceID=<RESOURCE_ID>&Target=<DYNAMIC_IP>

It's working when I try to update my IP using browser's address field, but I can't find out how to make it work using my router where there are standard fields:
* Server
* User Name
* Password
* Host Name
* URL

Any help appreciated.

You just need something that can make a web request. Doesn't need to be your router.

http://www.linode.com/api/dns/domain.resource.update

If you send the literal string [remote_addr] for the value of the target, our end will substitute it with the requester's IP. No need to scrape your local IP from the router or whatever...

Hope that helps,
-Chris

Thanks, Chris, that will make my task easier!

By the way, are there some reasonable limits regarding the regularity of sending such requests? For example, if I set that line to cron to be executed every half hour, is it too often?

Changed zones are only published every quarter hour. I think making your API call every 30 or 60 minutes is perfectly acceptable. Thanks for asking

-Chris

My approach is to run my script much more frequently (once a minute, I think, might have been once per 5 minutes), but only send a linode API query if the IP has changed, which is pretty rare. For IP change tracking I have my home file server (the thing getting the dynamic IP) call a PHP script on my linode that simply returns the IP of the person accessing the script:

http://fixppp.org/ip.php

The script is basically just like <?php print $_SERVER['REMOTE_ADDR']; ?> or something.

It required more effort to implement than just a simple linode API call every 30 minutes (which is a single API call), but it lets me get updates much quicker while simultaneously accessing the linode API much less frequently.