作为一名维护生产环境Linux服务器的系统管理员，在有些情况下，你需要根据地理位置，有选择性地阻止或允许网络流量。那么教你两种屏蔽海外流量的方法。
方法一：使用大神的开源脚本，屏蔽指定国家地区的IP访问
wget https://raw.githubusercontent.com/iiiiiii1/Block-IPs-from-countries/master/block-ips.sh
sh block-ips.sh
方法二：使用IPIP的数据库进行流量屏蔽（推荐，目前已支持centos6和7还有ubuntu系统）
#!/bin/bash#判断是否具有root权限root_need() {
if [[ $EUID -ne 0 ]]; then
echo "Error:This script must be run as root!" 1>&2
exit 1
fi
}
#检查系统分支及版本(主要是：分支->>版本>>决定命令格式)check_release() {
if uname -a | grep el7 ; then
release="centos7"
elif uname -a | grep el6 ; then
release="centos6"
yum install ipset -y
elif cat /etc/issue |grep -i ubuntu ; then
release="ubuntu"
apt install ipset -y
fi
}
#安装必要的软件(wget),并下载中国IP网段文件(最后将局域网地址也放进去)get_china_ip() {
#安装必要的软件(wget)
rpm --help >/dev/null 2>&1 && rpm -qa |grep wget >/dev/null 2>&1 ||yum install -y wget ipset >/dev/null 2>&1
dpkg --help >/dev/null 2>&1 && dpkg -l |grep wget >/dev/null 2>&1 ||apt-get install wget ipset -y >/dev/null 2>&1
#该文件由IPIP维护更新，大约一月一次更新(也可以用我放在国内的存储的版本，2018-9-8日版)
[ -f china_ip_list.txt ] && mv china_ip_list.txt china_ip_list.txt.old
wget https://github.com/17mon/china_ip_list/blob/master/china_ip_list.txt
cat china_ip_list.txt |grep 'js-file-line">' |awk -F'js-file-line">' '{print $2}' |awk -F' '{print $1}' >> china_ip.txt rm -rf china_ip_list.txt #wget https://qiniu.wsfnk.com/china_ip.txt#放行局域网地址echo "192.168.0.0/18" >> china_ip.txt echo "10.0.0.0/8" >> china_ip.txt echo "172.16.0.0/12" >> china_ip.txt } #只允许国内IP访问ipset_only_china() { echo "ipset create whitelist-china hash:net hashsize 10000 maxelem 1000000" > /etc/ip-black.sh for i in $( cat china_ip.txt ) do echo "ipset add whitelist-china $i" >> /etc/ip-black.sh doneecho "iptables -I INPUT -m set --match-set whitelist-china src -j ACCEPT" >> /etc/ip-black.sh #拒绝非国内和内网地址发起的tcp连接请求（tcp syn 包）（注意，只是屏蔽了入向的tcp syn包，该主机主动访问国外资源不用影响）echo "iptables -A INPUT -p tcp --syn -m connlimit --connlimit-above 0 -j DROP" >> /etc/ip-black.sh #拒绝非国内和内网发起的ping探测（不影响本机ping外部主机）echo "iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP" >> /etc/ip-black.sh #echo "iptables -A INPUT -j DROP" >> /etc/ip-black.sh rm -rf china_ip.txt } run_setup() { chmod +x /etc/rc.local sh /etc/ip-black.sh rm -rf /etc/ip-black.sh #下面这句主要是兼容centos6不能使用"-f"参数 ipset save whitelist-china -f /etc/ipset.conf || ipset save whitelist-china > /etc/ipset.conf [ $release = centos7 ] && echo "ipset restore -f /etc/ipset.conf" >> /etc/rc.local [ $release = centos6 ] && echo "ipset restore >> /etc/rc.local echo "iptables -I INPUT -m set --match-set whitelist-china src -j ACCEPT" >> /etc/rc.local echo "iptables -A INPUT -p tcp --syn -m connlimit --connlimit-above 0 -j DROP" >> /etc/rc.local echo "iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP" >> /etc/rc.local #echo "iptables -A INPUT -j DROP" >> /etc/rc.local } main() { check_release get_china_ip ipset_only_china case "$release" in centos6) run_setup ;; centos7) chmod +x /etc/rc.d/rc.local run_setup ;; ubuntu) sed -i '/exit 0/d' /etc/rc.local run_setup echo "exit 0" >> /etc/rc.local ;; esac } main 文章来源网络，作者：运维，如若转载，请注明出处：https://shuyeidc.com/wp/219483.html<
