pfSense

Did some network sniffing and their is sporadic TCP retransmissions of the initial SYN to the various checkup.dyndns.com IP addresses until a SYN ACK is finally received. From that point on (TCP connection established) the check happens smoothly without further packet loss.

Would be nice if we could specify our own check ip service to use instead of relying on third party. That's a big part of why I set up my own dynamic DNS RFC 2136 service. Already have my own ip check service from before when I was doing my own custom dynamic DNS.

Hard coded my service https://url... along with curl auth into services.inc and it works. Much faster too. Would be nice for this ip check, along with auth, and ssl verify peer options to be setup similar to the Dynamic DNS Client custom config (see case 'custom': in dyndns.class).

curl_setopt($ip_ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
// curl_setopt($ip_ch, CURLOPT_USERPWD, "{$this->_dnsUser}:{$this->_dnsPass}");
curl_setopt($ip_ch, CURLOPT_USERPWD, "$username:$password");


Configurable check ip service solution to this can be found here.
https://github.com/pfsense/pfsense/pull/3008

Supports:
Custom check ip service URL
User authentication to the service
Verify SSL peer