Is it possible to specify the external ipv4 and ipv6 address? There are scenarios where the eggress traffic uses a different address to ingress, or the host has

Is it possible to specify the external ipv4 and ipv6 address? There are scenarios where the eggress traffic uses a different address to ingress, or the host has multiple internet-connected addresses but only one has a firewall permitting traffic to the nominated port.