Linux

iproute2

ip ro
ip ro add {passerelle} via dev {iface}
ip ro add {reseau_distant} via {passerelle}

Windows

route print
route add {reseau} mask {masque} {passerelle} if {num_interface} metric {priorite_regle}
route del {reseau}

route add {reseau} masque {masque} 0.0.0.0 if {num} metric {priorite_regle}