iproute-persistent

#!/bin/sh

save() {
        ip route > routes.save
}

restore() {
        if ! test -f routes.save; then
                echo "routes.save not found"
                exit 1;
        fi
        local default_route=""
        while read -r route; do
                if echo "$route"|grep default > /dev/nul; then
                        default_route="$route"
                elif ! ip route|grep "$route" > /dev/null; then
                        echo "adding: $route"
                        ip route add $route
                fi
        done < routes.save

        if ! test -z "$default_route"; then
                echo "adding default route: $default_route"
                ip route add $default_route;
        fi
}

help() {
        echo "iproute-persistent"
        echo
        echo "Commands:"
        echo "  save    -- save routes to /etc/routes.save file"
        echo "  restore -- restore routes from /etc/routes.save"
}

case $1 in
        save)
                save
        ;;
        restore)
                restore
        ;;
        help | -h | --help)
        help
        ;;
        *)
        echo "unknown command $1"
        help
        ;;
esac