解决多链路总掉线的问题

如果多链路负载均衡中的一个链路丢失，默认路由会造成错误

下面的方法可以根据当时情况重建默认路由，并判断多链路阀值，低于阀值自动重拨

#! /bin/bash
RE_ROUTE()
{
        CMD="ip route replace default equalize "

        for i in $ADSL_DEV
        do
                CMD="$CMD nexthop dev $i weight 1"
        done

        $CMD &>/dev/null
}

RE_ADSL()
{

        # because there are 6 lines in my company
        for PPP in 0 1 2 3 4 5
        do
                ifdown ppp$PPP
        done

        sleep 1

        for PPP in 0 1 2 3 4 5
        do
                ifup ppp$PPP
        done

        # another rules by platinum

        firewall
}

SET_QDNS()
{
        ADSL_DEV_FIRST=`echo $ADSL_DEV|awk '{print $1}'`
        /usr/local/ez-ipupdate-3.0.10-linux-i386/ez-ipupdate -S qdns -h 域名 -u USER:PASS -i $ADSL_DEV_FIRST &>/dev/null
}

ADSL_DEV=`ifconfig|awk '/ppp.*Link/{print $1}'`

if [ "`echo $ADSL_DEV|wc -w`" -lt "4" ]; then
        echo "`date` $ADSL_DEV" >> /var/log/adsl.log
        RE_ADSL
fi

RE_ROUTE
SET_QDNS