bin bash ip_eth1 192 168 ip от провайдера ip_eth2 80 70 xxx yyy ip от

#!/bin/bash

ip_eth1=192.168.0.4       # ip от провайдера 1
ip_eth2=80.70.xxx.yyy       # ip от провайдера 2

route_default=192.168.0.1        # дефолтный шлюз
route_eth1=192.168.0.1        # шлюз провайдера 1
route_eth2=80.70.xxx.zzz        # шлюз провайдера 2

. /lib/lsb/init-functions

start() {
	log_daemon_msg "Setting routes"
	ip route replace default via $route_eth1 table intranet && echo -n "eth1 "
	ip route replace default via $route_eth2 table internet && echo -n "eth2 "

	ip rule add from $ip_eth1 table intranet
	ip rule add from $ip_eth2 table internet

	ip route add default via $route_default
	log_end_msg 0
}

stop() {
	log_daemon_msg "Unsetting routes"
	route del default dev eth1 && echo -n "eth1 "
	route del default dev eth2 && echo -n "eth2 "
}

case "$1" in
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		start
		;;
	*)
		echo "Usage: $0 {start|stop|reload}"
		;;
esac