两步:
ip firewall mangle里面
chain=prerouting src-address=192.168.0.222
action=mark-routing new-routing-mark=aa
passthrough=yes
ip routes里面
add dst-address=0.0.0.0/0 gateway=你要走的单线网关 scope=255 target-scope=10 \
routing-mark=aa comment="" disabled=no