Support IPv6 requests for any DDNS service. Implement #11177
Introduce get_dyndns_source_address() to find the source address to be used when sending a DDNS request. It supports both IPv4 and IPv6 - determined by the configured gateway and addresses on the interface.
Update dyndnsCheckIP() to use get_dyndns_source_address() for IPv6 support. Also update the IP pattern to improve matching potential.
Update the DDNS class to use the new code for IPv6 requests.
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Support IPv6 requests for any DDNS service. Implement #11177
Introduce get_dyndns_source_address() to find the source address to be
used when sending a DDNS request. It supports both IPv4 and IPv6 -
determined by the configured gateway and addresses on the interface.
Update dyndnsCheckIP() to use get_dyndns_source_address() for IPv6
support. Also update the IP pattern to improve matching potential.
Update the DDNS class to use the new code for IPv6 requests.