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我使用 Ubuntu 服务器作为 NAT 路由器。WAN接口是eth1,LAN接口是eth0。我在 LAN 端使用 ucarp 虚拟 ip 进行故障转移。我正在编写一个脚本,eth0如果 WAN 链接或默认网关出现故障,它将关闭 LAN 接口(如果 LAN 接口出现故障,那么 ucarp 可以将 NAT 网关 ip 释放到网络上的另一个路由器)。此外,如果 WAN ip 被 ping 通,则 LAN 接口应该会出现并且应该保持开启,直到可以 ping 通 WAN ip。

重击脚本:

#!/bin/bash
t1=$(ifconfig | grep -o eth0)
t2="eth0"
#RMT_IP = "8.8.8.8"
SLEEP_TIME="10"

ping -c 2 8.8.8.8 > /dev/null
   PING_1=$?

if [ $PING_1 = 1 ]; then
    if [ "$t1" != "$t2" ]; then
        ifconfig eth0 up
        echo "Iface brought up"
    else
        echo "Iface is already up"
    fi
else
    if [ "$t1" = "$t2" ]; then
        ifconfig eth0 down
        echo "Iface brought down"
    else
        echo "iface already down"
    fi
fi

sleep $SLEEP_TIME

该脚本对我不起作用。我想要的是,如果可以 ping 通 WAN ip,那么 LAN 接口eth0应该保持打开状态。如果无法 ping 通 WAN ip,则应关闭接口。该脚本应每 10 秒循环运行一次。如果 WAN ip 长时间无法 ping 通,eth0则应仅保持关闭状态,如果 WAN ip 在一段时间后 ping 通,eth0则应启动。我还计划在启动时运行脚本作为新贵的工作。

编辑 1: 我的最终脚本:

#!/bin/bash

timeout=5         # delay between checks
pingip='8.8.8.8'   # what to ping
iface="eth0"
LOG_FILE="/var/log/syslog"
isdown=0            # indicate whether the interface is up or down
                   # start assuming interface is up

while true; do
    LOG_TIME=`date +%b' '%d' '%T`
    if ping -q -c 2 "$pingip" >> /dev/null ; then      # ping is good - bring iface up
        if [ "$isdown" -ne 0 ] ; then
            ifup $iface && isdown=0
            printf "$LOG_TIME $0: Interface brought up: %s\n" "$iface" | tee -a $LOG_FILE
        fi
    else                                 # ping is bad - bring iface down
        beep -f 4000
        if [ "$isdown" -ne 1 ] ;  then
            ifdown $iface && isdown=1
            printf "$LOG_TIME $0: Interface brought down: %s\n" "$iface" | tee -a $LOG_FILE
        fi
    fi
    sleep "$timeout"
done
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1 回答 1

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如果 ping 成功,请尝试这个,然后 如果 ping 失败,则$iface启动
$iface

#!/bin/bash

timeout=3               # delay between checks
iface="eth0"            # which interface to bring up/down
pingip='8.8.8.8'        # what to ping
isdown=-1               # indicate whether the interface is up(0) or down(1)
                        # start in unknown state

while true; do
    if ping -q -c 2 "$pingip"; then       # if ping is succeeds bring iface up
        if [ "$isdown" -ne 0 ]; then      # if not already up
            ifconfig "$iface" up && isdown=0
            printf ":: iface brought up: %s\n" "$iface"
        fi
    elif [ "$isdown" -ne 1 ]; then        # if ping failed, bring iface down, if not already down
        ifconfig "$iface" down && isdown=1
        printf ":: iface brought down: %s\n" "$iface"
    fi
    sleep "$timeout"
done
于 2012-04-20T10:43:55.000 回答