Dyndns "freeDNS API Version 2 (v6)" not working

patient0

After the upgrade from 24.11 to latest 25.03-BETA, the Dyndns for IPv6 of type "freeDNS API Version 2 (v6)" is not working anymore, the following error is found in the log:

2025-04-18 20:23:08.602892+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.custom.domain.tld): _update() ending.
2025-04-18 20:23:08.602877+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Curl error occurred: Could not resolve host: v6.sync.afraid.org
2025-04-18 20:23:08.602855+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.custom.domain.tld): _checkStatus() starting.
2025-04-18 20:23:08.602825+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Response Data:
2025-04-18 20:23:08.602796+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Response Header:
2025-04-18 20:23:08.599820+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (nakedandafraid.p1ng.li): _update() starting.
2025-04-18 20:23:08.556484+02:00 	php-fpm 	65875 	/services_dyndns_edit.php: Dynamic DNS: updatedns() starting

v6.sync.afraid.org does resolve but only to AAAA:

[25.03-BETA][root@pfSense]/root: host v6.sync.afraid.org
v6.sync.afraid.org has IPv6 address 2607:f0d0:1e04:74::2

Switching back to type "freeDNS (v6)" solved it.

marcosm

That's likely a temporary issue on the system. Both of those DDNS services perform the same curl request but with different URLs. Something to note is that now DDNS supports sending requests over IPv6 and will prefer it if available unless specifically excluded for a DDNS service. The code effectively does the following which you can test out at Diagnostics > Command Prompt > Execute PHP Commands:

$ch = curl_init();
curl_setopt($ch, CURLOPT_IPRESOLVE, AF_INET6);
curl_setopt($ch, CURLOPT_INTERFACE, '2001:db8:ffff:5:5::1');
curl_setopt($ch, CURLOPT_URL, 'https://v6.sync.afraid.org/u/');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_FORBID_REUSE, true);
curl_exec($ch);
var_dump(@curl_error($ch));

Replace the IPv6 with yours. Testing that here gives:

HTTP/1.1 404 Not Found
Server: nginx
Date: Fri, 18 Apr 2025 22:59:02 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding

Error 404 : Page not found
string(0) ""

This indicates that the FQDN was resolvable. Otherwise it prints e.g.:

string(45) "Could not resolve host: v6.example.afraid.org"

patient0

@marcosm said in Dyndns "freeDNS API Version 2 (v6)" not working:

That's likely a temporary issue on the system

Thanks for the quick response! You think it's a temporary issue on my system or on their end?

Running the above commands indeed works (adding the token to the CURLOPT_ULR) and returns

No IP change detected for my.custom.tld with IP 2a02:168:something::something, skipping update
string(0) ""

(switched back and it does not work, same error. Since I now know that the above code works, I'll check what is set and if/how it differs)

marcosm

I think it's a local issue. Does the code work with both IPv4 and IPv6 (set the first line to AF_INET for IPv4)?

patient0

@marcosm said in Dyndns "freeDNS API Version 2 (v6)" not working:

I think it's a local issue. Does the code work with both IPv4 and IPv6 (set the first line to AF_INET for IPv4)?

Yes, I do have setup one for IPv4 and one for IPv6, both were working on 24.11 for some time. The issue with IPv6 started after the upgrade to 25.3-BETA.

Parallel there are two (one IPv4 and one IPv6) setup for duckdns.org using the Custom/Custom v6 service, which are running fine too.

marcosm

As a test you can try adding the following patch which will log info about the curl handle used for the request:

diff --git a/src/etc/inc/dyndns.class b/src/etc/inc/dyndns.class
index 541d9b6397..4866bf9da6 100644
--- a/src/etc/inc/dyndns.class
+++ b/src/etc/inc/dyndns.class
@@ -1925,6 +1925,7 @@
 				$this->_checkStatus($http_code, $curl_error, $data, $header);
 			}
 			if ($this->_dnsVerboseLog) {
+				log_error(var_export(curl_getinfo($ch), true));
 				log_error(sprintf(gettext('Dynamic DNS %1$s (%2$s): _update() ending.'), $this->_dnsService, $this->_FQDN));
 			}
 		}

Try that on both 24.11 and 25.03-BETA and compare the results.

patient0

@marcosm said in Dyndns "freeDNS API Version 2 (v6)" not working:

Try that on both 24.11 and 25.03-BETA and compare the results.

WAN was always set to DHCP6. Up to 24.11 the IP I got was from the <usual prefix> + EUI64 (ending in :539e). After the upgrade I now get <usual prefix> + ::<only last group is set>. The gateway is the same and all works the same for me.

As for the result of the added log_error(). Quite a few fields are not set in the 25.03 output. But I don't know why they are not set.

The result for 25.03:

2025-04-21 20:43:28.800085+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _update() ending.
2025-04-21 20:43:28.800073+02:00 	php-fpm 	45310 	)
2025-04-21 20:43:28.800067+02:00 	php-fpm 	45310 	'cainfo' => '',
2025-04-21 20:43:28.800060+02:00 	php-fpm 	45310 	'capath' => '',
2025-04-21 20:43:28.800054+02:00 	php-fpm 	45310 	'effective_method' => 'GET',
2025-04-21 20:43:28.800048+02:00 	php-fpm 	45310 	'total_time_us' => 137927,
2025-04-21 20:43:28.800041+02:00 	php-fpm 	45310 	'starttransfer_time_us' => 0,
2025-04-21 20:43:28.800034+02:00 	php-fpm 	45310 	'redirect_time_us' => 0,
2025-04-21 20:43:28.800028+02:00 	php-fpm 	45310 	'pretransfer_time_us' => 0,
2025-04-21 20:43:28.800021+02:00 	php-fpm 	45310 	'namelookup_time_us' => 0,
2025-04-21 20:43:28.800015+02:00 	php-fpm 	45310 	'connect_time_us' => 0,
2025-04-21 20:43:28.800008+02:00 	php-fpm 	45310 	'appconnect_time_us' => 0,
2025-04-21 20:43:28.800002+02:00 	php-fpm 	45310 	'scheme' => 'https',
2025-04-21 20:43:28.799996+02:00 	php-fpm 	45310 	'ssl_verifyresult' => 0,
2025-04-21 20:43:28.799989+02:00 	php-fpm 	45310 	'protocol' => 2,
2025-04-21 20:43:28.799982+02:00 	php-fpm 	45310 	'http_version' => 0,
2025-04-21 20:43:28.799976+02:00 	php-fpm 	45310 	'local_port' => -1,
2025-04-21 20:43:28.799970+02:00 	php-fpm 	45310 	'local_ip' => '',
2025-04-21 20:43:28.799963+02:00 	php-fpm 	45310 	'primary_port' => -1,
2025-04-21 20:43:28.799957+02:00 	php-fpm 	45310 	),
2025-04-21 20:43:28.799950+02:00 	php-fpm 	45310 	array (
2025-04-21 20:43:28.799944+02:00 	php-fpm 	45310 	'certinfo' =>
2025-04-21 20:43:28.799938+02:00 	php-fpm 	45310 	'primary_ip' => '',
2025-04-21 20:43:28.799931+02:00 	php-fpm 	45310 	'redirect_url' => '',
2025-04-21 20:43:28.799925+02:00 	php-fpm 	45310 	'redirect_time' => 0.0,
2025-04-21 20:43:28.799918+02:00 	php-fpm 	45310 	'starttransfer_time' => 0.0,
2025-04-21 20:43:28.799912+02:00 	php-fpm 	45310 	'upload_content_length' => -1.0,
2025-04-21 20:43:28.799905+02:00 	php-fpm 	45310 	'download_content_length' => -1.0,
2025-04-21 20:43:28.799899+02:00 	php-fpm 	45310 	'speed_upload' => 0.0,
2025-04-21 20:43:28.799892+02:00 	php-fpm 	45310 	'speed_download' => 0.0,
2025-04-21 20:43:28.799886+02:00 	php-fpm 	45310 	'size_download' => 0.0,
2025-04-21 20:43:28.799879+02:00 	php-fpm 	45310 	'size_upload' => 0.0,
2025-04-21 20:43:28.799873+02:00 	php-fpm 	45310 	'pretransfer_time' => 0.0,
2025-04-21 20:43:28.799867+02:00 	php-fpm 	45310 	'connect_time' => 0.0,
2025-04-21 20:43:28.799860+02:00 	php-fpm 	45310 	'namelookup_time' => 0.0,
2025-04-21 20:43:28.799854+02:00 	php-fpm 	45310 	'total_time' => 0.137927,
2025-04-21 20:43:28.799848+02:00 	php-fpm 	45310 	'redirect_count' => 0,
2025-04-21 20:43:28.799841+02:00 	php-fpm 	45310 	'ssl_verify_result' => 0,
2025-04-21 20:43:28.799833+02:00 	php-fpm 	45310 	'filetime' => -1,
2025-04-21 20:43:28.799827+02:00 	php-fpm 	45310 	'request_size' => 0,
2025-04-21 20:43:28.799820+02:00 	php-fpm 	45310 	'header_size' => 0,
2025-04-21 20:43:28.799814+02:00 	php-fpm 	45310 	'http_code' => 0,
2025-04-21 20:43:28.799807+02:00 	php-fpm 	45310 	'content_type' => NULL,
2025-04-21 20:43:28.799800+02:00 	php-fpm 	45310 	'url' => 'https://v6.sync.afraid.org/u/<MYTOKEN>/?hostname=my.domain.tld&myip=2a02:168:...::27',
2025-04-21 20:43:28.799791+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: array (
2025-04-21 20:43:28.799720+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Curl error occurred: Could not resolve host: v6.sync.afraid.org
2025-04-21 20:43:28.799701+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _checkStatus() starting.
2025-04-21 20:43:28.799674+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Response Data:
2025-04-21 20:43:28.799645+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Response Header:
2025-04-21 20:43:28.605545+02:00 	php-fpm 	45310 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _update() starting.

and from 24.11:

2025-04-21 20:52:19.162563+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _update() ending.
2025-04-21 20:52:19.162548+02:00 	php-fpm 	623 	)
2025-04-21 20:52:19.162541+02:00 	php-fpm 	623 	'cainfo' => '',
2025-04-21 20:52:19.162533+02:00 	php-fpm 	623 	'capath' => '',
2025-04-21 20:52:19.162526+02:00 	php-fpm 	623 	'effective_method' => 'GET',
2025-04-21 20:52:19.162518+02:00 	php-fpm 	623 	'total_time_us' => 1268135,
2025-04-21 20:52:19.162511+02:00 	php-fpm 	623 	'starttransfer_time_us' => 1268077,
2025-04-21 20:52:19.162503+02:00 	php-fpm 	623 	'redirect_time_us' => 0,
2025-04-21 20:52:19.162495+02:00 	php-fpm 	623 	'pretransfer_time_us' => 1012777,
2025-04-21 20:52:19.162488+02:00 	php-fpm 	623 	'namelookup_time_us' => 620555,
2025-04-21 20:52:19.162480+02:00 	php-fpm 	623 	'connect_time_us' => 752440,
2025-04-21 20:52:19.162473+02:00 	php-fpm 	623 	'appconnect_time_us' => 1012658,
2025-04-21 20:52:19.162465+02:00 	php-fpm 	623 	'scheme' => 'https',
2025-04-21 20:52:19.162457+02:00 	php-fpm 	623 	'ssl_verifyresult' => 0,
2025-04-21 20:52:19.162450+02:00 	php-fpm 	623 	'protocol' => 2,
2025-04-21 20:52:19.162442+02:00 	php-fpm 	623 	'http_version' => 2,
2025-04-21 20:52:19.162435+02:00 	php-fpm 	623 	'local_port' => 6642,
2025-04-21 20:52:19.162427+02:00 	php-fpm 	623 	'local_ip' => '2a02:168:...:539e',
2025-04-21 20:52:19.162419+02:00 	php-fpm 	623 	'primary_port' => 443,
2025-04-21 20:52:19.162412+02:00 	php-fpm 	623 	),
2025-04-21 20:52:19.162404+02:00 	php-fpm 	623 	array (
2025-04-21 20:52:19.162397+02:00 	php-fpm 	623 	'certinfo' =>
2025-04-21 20:52:19.162389+02:00 	php-fpm 	623 	'primary_ip' => '2607:f0d0:1e04:74::2',
2025-04-21 20:52:19.162381+02:00 	php-fpm 	623 	'redirect_url' => '',
2025-04-21 20:52:19.162374+02:00 	php-fpm 	623 	'redirect_time' => 0.0,
2025-04-21 20:52:19.162366+02:00 	php-fpm 	623 	'starttransfer_time' => 1.268077,
2025-04-21 20:52:19.162358+02:00 	php-fpm 	623 	'upload_content_length' => 0.0,
2025-04-21 20:52:19.162351+02:00 	php-fpm 	623 	'download_content_length' => -1.0,
2025-04-21 20:52:19.162343+02:00 	php-fpm 	623 	'speed_upload' => 0.0,
2025-04-21 20:52:19.162336+02:00 	php-fpm 	623 	'speed_download' => 75.0,
2025-04-21 20:52:19.162328+02:00 	php-fpm 	623 	'size_download' => 96.0,
2025-04-21 20:52:19.162321+02:00 	php-fpm 	623 	'size_upload' => 0.0,
2025-04-21 20:52:19.162313+02:00 	php-fpm 	623 	'pretransfer_time' => 1.012777,
2025-04-21 20:52:19.162306+02:00 	php-fpm 	623 	'connect_time' => 0.75244,
2025-04-21 20:52:19.162298+02:00 	php-fpm 	623 	'namelookup_time' => 0.620555,
2025-04-21 20:52:19.162291+02:00 	php-fpm 	623 	'total_time' => 1.268135,
2025-04-21 20:52:19.162283+02:00 	php-fpm 	623 	'redirect_count' => 0,
2025-04-21 20:52:19.162275+02:00 	php-fpm 	623 	'ssl_verify_result' => 0,
2025-04-21 20:52:19.162267+02:00 	php-fpm 	623 	'filetime' => -1,
2025-04-21 20:52:19.162260+02:00 	php-fpm 	623 	'request_size' => 184,
2025-04-21 20:52:19.162252+02:00 	php-fpm 	623 	'header_size' => 186,
2025-04-21 20:52:19.162245+02:00 	php-fpm 	623 	'http_code' => 200,
2025-04-21 20:52:19.162237+02:00 	php-fpm 	623 	'content_type' => 'text/plain;charset=UTF-8',
2025-04-21 20:52:19.162228+02:00 	php-fpm 	623 	'url' => 'https://v6.sync.afraid.org/u/<MYTOKEN>/?hostname=my.domain.tld&myip=2a02:168:...:539e',
2025-04-21 20:52:19.162215+02:00 	php-fpm 	623 	/services_dyndns_edit.php: array (
2025-04-21 20:52:19.162147+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _checkStatus() ending.
2025-04-21 20:52:19.162116+02:00 	php-fpm 	623 	/services_dyndns_edit.php: phpDynDNS (my.domain.tld): (Success) IP Address Changed Successfully!
2025-04-21 20:52:19.161976+02:00 	php-fpm 	623 	/services_dyndns_edit.php: phpDynDNS: updating cache file /conf/dyndns_wanfreedns2-v6'my.domain.tld'3_v6.cache: 2a02:168:...:539e
2025-04-21 20:52:19.159426+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): 2a02:168:...:539e extracted from local system.
2025-04-21 20:52:19.157769+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _checkIP() starting.
2025-04-21 20:52:19.157640+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _checkStatus() starting.
2025-04-21 20:52:19.157598+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Data: Updated my.domain.tld from 2a02:168:..::27 to 2a02:168:...:539e
2025-04-21 20:52:19.157587+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header:
2025-04-21 20:52:19.157577+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header:
2025-04-21 20:52:19.157567+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Vary: Accept-Encoding
2025-04-21 20:52:19.157557+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Connection: keep-alive
2025-04-21 20:52:19.157547+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Transfer-Encoding: chunked
2025-04-21 20:52:19.157537+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Content-Type: text/plain;charset=UTF-8
2025-04-21 20:52:19.157526+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Date: Mon, 21 Apr 2025 18:45:31 GMT
2025-04-21 20:52:19.157515+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: Server: nginx
2025-04-21 20:52:19.157478+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Response Header: HTTP/1.1 200 OK
2025-04-21 20:52:17.889137+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _update() starting.
2025-04-21 20:52:17.889043+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS (my.domain.tld): running get_failover_interface for wan. found ax0
2025-04-21 20:52:17.889006+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): 2a02:168:...:539e extracted from local system.
2025-04-21 20:52:17.856213+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS freedns2-v6 (my.domain.tld): _checkIP() starting.
2025-04-21 20:52:17.856051+02:00 	php-fpm 	623 	/services_dyndns_edit.php: Dynamic DNS: updatedns() starting

Gertjan

25.03 :

@patient0 said in Dyndns "freeDNS API Version 2 (v6)" not working:

2025-04-21 20:43:28.799720+02:00 php-fpm 45310 /services_dyndns_edit.php: Curl error occurred: Could not resolve host: v6.sync.afraid.org

That's a show stopper.
Resolving works over IPv4 and IPv6 and should answer "2607:f0d0:1e04:74::2"
It works for me :

login-to-view

patient0

@Gertjan said in Dyndns "freeDNS API Version 2 (v6)" not working:

That's a show stopper.

Yes, but it's not that easy. Marco is assisting me in debugging the issue.

I suspect the issue is because it got an IPv6 DNS record only. The curl call get's assembled in the code but it fails to detect it as IPv6 and attempts using IPv4.

But we will get there, there are multiple work arounds, so no pressing issue.

Gertjan

@patient0 said in Dyndns "freeDNS API Version 2 (v6)" not working:

I suspect the issue is because it got an IPv6 DNS record only. The curl call get's assembled in the code but it fails to detect it as IPv6 and attempts using IPv4.

v6.sync.afraid.org can be resolved using IPv4 or IPv6.
If IPv6 was tried first, but failed, then the resolver would (should !) use the good old IPv4.

[25.03-BETA][root@pfSense.bhf.tld]/root: dig -4 @127.0.0.1 v6.sync.afraid.org AAAA +short
2607:f0d0:1e04:74::2

Its normal that "v6.sync.afraid.org" only resolves to IPv6 ... a bit like ipv6.google.com is an IPv6 only host name.
See here : https://freedns.afraid.org/guide/dd-wrt-v2/

login-to-view

patient0

@Gertjan said in Dyndns "freeDNS API Version 2 (v6)" not working:

v6.sync.afraid.org can be resolved using IPv4 or IPv6.

Yes of course, but: it did work on 24.11 and it doesn't work anymore. I don't know where in the PHP code the confused starts and there is a lot of new code in 25.03 for that part. I couldn't locate it yet, Marco will have better chance doing that I guess.

(It happens in /etc/inc/dyndns.class and /etc/inc/services.inc)

marcosm

For reference:
https://redmine.pfsense.org/issues/16156