Host with both IPv6 and IPv4 tries to use IPv6 to update A record

[timkgh]

I have a host that has a static IPv6 address but its IPv4 address is dynamic. I'd like to update the IPv4 when it changes, but cloudflare-ddns-client obtains the IPv6 and tries to set it for the A record which of course fails:

10:37PM INF Found public IP '2600:1900:...
...
Error: failed to update DNS record '<redacted>' to IP address '2600:1900:...': HTTP status 400: Content for A record must be a valid IPv4 address. (9005)

The DNS and URL queries need to force an IPv4 connection, the equivalent of:
dig -4 myip.opendns.com A @resolver1.opendns.com

[d4z3x]

This is be fixed in my fork. I did contribute 2 things back, but I don't see the author active. So feel free to use the fork at https://github.com/d4z3x/cloudflare-ddns-client

[rightkick]

Ideally this should be supported from flags to allow the user to define IP address family, such as --ipv4 and --ipv6.

One alternative work-around is to disable IPV6 at the host by adding the following at /etc/sysctl.conf:

net.ipv4.ip_forward = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Then apply with sysctl -p /etc/sysctl.conf