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get active zones, and the interfaces they are assigned to

$ sudo firewall-cmd --get-active-zones

set active zone

$ sudo firewall-cmd --change-interface=w1p61s0 --zone=home

add arbitrary port

$ sudo firewall-cmd --add-port=51234/tcp --zone=home

allow Gnome Boxes to connect through firewall 

firewall-cmd --direct --passthrough ipv6 -I FORWARD -o tap0 -j ACCEPT
firewall-cmd --direct --passthrough ipv6 -I FORWARD -i tap0 -j ACCEPT