gateways: far gateway IPv6 for https://github.com/opnsense/core/issues/4436
gateways: far gateway IPv6 for https://github.com/opnsense/core/issues/4436

(I'm not sure this works, let's ask for a test first)

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core