From: "Jonathan T. Leighton"
Date: Sun, 12 Feb 2017 17:26:05 -0500
> Under some circumstances IPv6 datagrams are sent with IPv4-mapped IPv6
> addresses as the source. Given an IPv6 socket bound to an IPv4-mapped
> IPv6 address, and an IPv6 destination address, both TCP and UDP will
> will send pa
Under some circumstances IPv6 datagrams are sent with IPv4-mapped IPv6
addresses as the source. Given an IPv6 socket bound to an IPv4-mapped
IPv6 address, and an IPv6 destination address, both TCP and UDP will
will send packets using the IPv4-mapped IPv6 address as the source. Per
RFC 6890 (Table 2