#!/bin/bash

_if=eth1
_svr=192.168.1.102
_timeout=10

_retry=0
while true; do
	ifconfig $_if down

	_cnt=0
	while [ $_cnt -lt $_timeout ]; do
		_stat=$(cat /sys/class/net/${_if}/operstate)
		[ "$_stat" == "up" ] || break
		: $((_cnt += 1))
		sleep 1
	done

	[ "$_stat" == "down" ] || {
		echo "down in $_timeout secs failed"
		exit 1
	}

	ifconfig $_if up

	_cnt=0
	while [ $_cnt -lt $_timeout ]; do
		_stat=$(cat /sys/class/net/${_if}/operstate)
		[ "$_stat" == "down" ] || break
		: $((_cnt += 1))
		sleep 1
	done

	[ "$_stat" == "down" ] || break

	if [ $_retry -eq 0 ]; then
		echo "up in $_timeout secs failed, retrying..."
		: $((_retry += 1))
		continue
	else
		echo "retry up failed"
		exit 2
	fi
done

ping -c 2 $_svr || exit 3