Give your token a name, e.g., OpenWRT DDNS and add the following permissions:<\/p>\n\n\n\n
- \n
- Zone, Zone: Read<\/li>\n\n\n\n
- Zone, DNS: Edit<\/li>\n<\/ul>\n\n\n\n
Under Zone Resources, select Include, then Specific Zone and choose your domain, e.g., example.com. Hit Continue to summary and then Create Token.<\/p>\n\n\n\n
Remember to take note of this token as you’ll need it later.<\/p>\n\n\n\n
Configuring OpenWRT<\/h2>\n\n\n\n
Next up is configuring OpenWRT to work with Cloudflare. We’ll mostly use the Web GUI, but we’ll also SSH into the router to make a small change to how authentication is done with Cloudflare.<\/p>\n\n\n\n
In the Web GUI, do the following:<\/p>\n\n\n\n
- \n
- Go to System <\/strong>-> Software <\/strong>and press Update lists<\/strong>.<\/li>\n\n\n\n
- Enter “ddns” into the filter field, and press Install <\/strong>on the
ddns-scripts-cloudflare<\/code> and theluci-app-ddns<\/code> packages.<\/li>\n\n\n\n- Log out of the GUI and back in. You should now have a Services<\/strong> -> Dynamic DNS<\/strong> option. Go to it.<\/li>\n\n\n\n
- Press Edit on
myddns_ipv4<\/code>.<\/li>\n\n\n\n- Set DDNS Service provider<\/strong> to
cloudflare.com-v4<\/code> and click Switch service<\/strong>.<\/li>\n\n\n\n- Then set Lookup Hostname<\/strong> and Domain<\/strong> to the domain you want to update, e.g.,
example.com<\/code>. Check the Enable<\/strong> and the Use HTTP Secure<\/strong> checkbox, set Path to CA-Certificate<\/strong> to\/etc\/ssl\/certs<\/code>.<\/li>\n\n\n\n- Finally, set the Username <\/strong>to
Bearer<\/code> and paste the Cloudflare token you created into the Password<\/strong> field and hit Save<\/strong> and then Save & Apply.<\/strong><\/li>\n<\/ol>\n\n\n\nIf you want to update a subdomain instead, use the following format in the Domain field:
sub@example.com<\/code> andsub.example.com<\/code> in the Lookup field.<\/p>\n\n\n\nThe settings should now look something like this:<\/p>\n\n\n\n
![\"Example](\"https:\/\/alexskra.com\/blog\/wp-content\/uploads\/2021\/09\/settings.png\")
Example of how the page might look when you have entered your settings.<\/figcaption><\/figure>\n\n\n\n Great work. We’re almost done. <\/p>\n\n\n\n
Change how your current IP is determined<\/h3>\n\n\n\n
If you head to Network <\/strong>-> Interfaces <\/strong>and you can see an IPV4-address under WAN, then OpenWRT knows what your current IP is, and you can skip this step.<\/p>\n\n\n\n
However, if you don’t see an IP address there, you’ll have to go to Services<\/strong> -> Dynamic DNS<\/strong> -> press Edit<\/strong> on myddns_ipv4 -> Go to Advanced Settings<\/strong> tab and change IP address source<\/strong> to something else.<\/p>\n\n\n\n
Start using it<\/h2>\n\n\n\n
Now, head to Services<\/strong> -> Dynamic DNS<\/strong> and press Restart DDns<\/strong>.<\/p>\n\n\n\n
Congratulations! \ud83c\udf89 It should now be up and running. You can press Edit<\/strong> -> Log file viewer<\/strong> to view the log of what it’s doing.<\/p>\n\n\n\n
If you have any questions, feel free to ask! \ud83d\ude42<\/p>\n\n\n\n
Questions and answers<\/h2>\n\n\n\n
Not all situations are the same, so here are some hopefully helpful answers where the problem is slightly different.<\/p>\n\n\n\n
What if I’m using Cloudflare to proxy traffic for the domain I’m using with DDNS?<\/h3>\n\n\n\n
The setup above works by using DNS to check what IP the domain
example.com<\/code> points to. If the domain doesn’t point to your current IP, then it’s updated.<\/p>\n\n\n\nBut what if you’re also using Cloudflare to proxy requests? When Cloudflare is proxying the requests,
example.com<\/code> no longer points at your IP address directly. Instead,example.com<\/code> points to Cloudflare, and Cloudflare becomes a middleman between your IP and the user.<\/p>\n\n\n\nProxying can be helpful for multiple things: It hides your IP address from the user, and Cloudflare can cache things like images for you.<\/p>\n\n\n\n
The issue arises when you now compare the IP of
example.com<\/code> with your IP. Since you’ll no longer get your own IP when checking the DNS record ofexample.com<\/code>, OpenWRT will think that the IP for the domain is wrong and start interacting with Cloudflare to update it.<\/p>\n\n\n\nThe thing is that the IP is most likely correct, but it can’t know for sure without using Cloudflare’s API to check.<\/p>\n\n\n\n
It goes something like this:<\/p>\n\n\n\n
- \n
- OpenWRT gets the IP of
example.com<\/code>, and Cloudflare returns its own IP’s as the real IP is hidden behind Cloudflare.<\/li>\n\n\n\n- OpenWRT thinks that DNS needs to be updated as you got Cloudflare’s IP and not your own. <\/li>\n\n\n\n
- It connects to Cloudflare using the API and gains access to see the real IP the domain points to through Cloudflare.<\/li>\n\n\n\n
- If the real IP is wrong, it’s updated to your current IP.<\/li>\n<\/ol>\n\n\n\n
So, as you can see, it will still work, but you’ll have unnecessary interactions with the Cloudflare API.<\/p>\n\n\n\n
So you might wonder: How do we avoid unnecessary interactions with Cloudflare? <\/p>\n\n\n\n
There is a clever solution to this problem that is possible thanks to Cloudflare supporting CNAME flattening. Let me show you how.<\/p>\n\n\n\n
First, create a new subdomain that is mostly random by going to DNS<\/strong> settings for your domain on Cloudflare. If you want to hide your IP, the domain should not be guessable. I’m going to use the subdomain
top-secret.example.com<\/code> in this example. Replace it with your own.<\/p>\n\n\n\nPress the Add record<\/strong> -> choose Type A<\/strong> -> enter
top-secret.example.com<\/code> in the Name field -> enter a incorrect IP like123.123.123.123<\/code> in the IPv4 field. Make sure it’s not proxied<\/strong> and press Save<\/strong>.<\/p>\n\n\n\n![\"How](\"https:\/\/alexskra.com\/blog\/wp-content\/uploads\/2021\/07\/image.png\")
<\/figure>\n\n\n\nNext, remove the record for the proxied domain. In my case, that’s
example.com<\/code>. Now, create a new DNS record, forexample.com<\/code>, but this time with the Type CNAME<\/strong>. Point it totop-secret.example.com<\/code> and enable proxying<\/strong>, then Save<\/strong>.<\/p>\n\n\n\n![\"How](\"https:\/\/alexskra.com\/blog\/wp-content\/uploads\/2021\/07\/image-1.png\")
<\/figure>\n\n\n\nAdding this CNAME will make Cloudflare redirect
example.com<\/code> totop-secret.example.com<\/code> internally, without exposing the actual IP of your server.<\/p>\n\n\n\nYou’re now done with the Cloudflare part. The only thing you need to do now is to make two small changes to your DDNS settings in OpenWRT.<\/p>\n\n\n\n
Go to the Basic settings for DDNS, change the Lookup Hostname<\/strong> to
top-secret.example.com<\/code>, and set the Domain <\/strong>totop-secret@example.com<\/code> (note the @). Click Save and Apply<\/strong>.<\/p>\n\n\n\n![\"Changing](\"https:\/\/alexskra.com\/blog\/wp-content\/uploads\/2021\/09\/Skjermbilde-2021-09-09-071239.png\")
<\/figure>\n\n\n\nNow, head to Services <\/strong>-> Dynamic DNS<\/strong> and press the Start\/Stop<\/strong> button twice <\/strong>to restart the service.<\/p>\n\n\n\n
This way, DDNS will interact with the secret subdomain(
top-secret.example.com<\/code>) to keep your DNS updated, while the actual domain(example.com<\/code>) points to the subdomain without exposing the domain or real IP.<\/p>\n\n\n\nYou should now have a setup that only talks to Cloudflare when the IP has changed, even if you’re using proxying. Congratulations!\u2b50<\/p>\n\n\n\n
Note that it, by default, might take up to 10 minutes to update the IP. You can view the logs to see what’s going on. (Dynamic DNS<\/strong> -> Log File Viewer<\/strong> tab)\ud83d\ude0a<\/p>\n","protected":false},"excerpt":{"rendered":"
Do you want to update your DNS when your IP changes? Are you using a router running OpenWRT and Cloudflare? Then this short guide is perfect for you!<\/p>\n","protected":false},"author":1,"featured_media":259,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[27,28,26],"class_list":["post-252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-cloudflare","tag-ddns","tag-openwrt"],"yoast_head":"\n
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- Enter “ddns” into the filter field, and press Install <\/strong>on the
- Go to System <\/strong>-> Software <\/strong>and press Update lists<\/strong>.<\/li>\n\n\n\n