网关1为192.168.0.1，网关2为172.16.111.1，编写shell脚本，实现网络切换

#!/bin/bash

# 判断当前默认网关是哪一个
default_gateway=$(route -n | awk '{if($1=="0.0.0.0") print $2}')

if [ "$default_gateway" = "192.168.0.1" ]; then
# 当前默认网关为网关1，切换到网关2
echo "Switching to Gateway 2"
route del default gw 192.168.0.1
route add default gw 172.16.111.1
elif [ "$default_gateway" = "172.16.111.1" ]; then
# 当前默认网关为网关2，切换到网关1
echo "Switching to Gateway 1"
route del default gw 172.16.111.1
route add default gw 192.168.0.1
else
# 默认网关不是网关1也不是网关2
echo "Unknown default gateway: $default_gateway"
fi

# 输出新的默认网关
echo "New default gateway: $(route -n | awk '{if($1=="0.0.0.0") print $2}')"