Hi,

it would be nice, if oping and especially noping would have a flag to
ping both, IPv4 and IPv6 address of the same host at the same time as if
it were two separate hosts, but without the need to give both IP
addresses explicitly.

There are multiple ways I could imagine how this could work:

1) New option, may -64, -46, -10 (4 + 6 :-) or -5 (between 4 and 6)
2) Give both options, e.g. "noping -4 -6 hostname"
3) The flags -4 and -6 only count for the hosts up to the other flag,
   e.g. "noping -4 hostname -6 hostname otherhost -4 otherhost"