Add -noipv4 flag
this adds a -noipv4 flag to complement the -noipv6 flag. it's mainly meant to be used for development purposes to make sure IPv4 won't be used as a fallback when testing IPv6-related functionality.
this adds a -noipv4 flag to complement the -noipv6 flag. it's mainly meant to be used for development purposes to make sure IPv4 won't be used as a fallback when testing IPv6-related functionality.