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firewall 端口转发
CentOS 7.0以上使用的是firewall,通过命令行配置实现端口转发。
(1)开启伪装IP
firewall-cmd --permanent --add-masquerade
(2)配置端口转发,将到达本机的12345端口的访问转发到另一台服务器的22端口。
firewall-cmd --permanent --add-forward-port=port=12345:proto=tcp:toaddr=192.168.172.131:toport=22
(3)重新载入,使其生效。
firewall-cmd --reload
实战:
13 firewall-cmd --add-masquerade --permanent
14 firewall-cmd --add-forward-port=port=80:proto=tcp:toport=80:toaddr=103.236.240.72 --permanent
15 firewall-cmd --add-forward-port=port=3306:proto=tcp:toport=3306:toaddr=103.236.240.72 --permanent
16 firewall-cmd --add-forward-port=port=20013:proto=tcp:toport=20013:toaddr=103.236.240.72 --permanent
17 firewall-cmd --add-forward-port=port=20021:proto=tcp:toport=20021:toaddr=103.236.240.72 --permanent
18 firewall-cmd --add-forward-port=port=8089:proto=tcp:toport=8089:toaddr=103.236.240.72 --permanent
19 firewall-cmd --add-forward-port=port=8001:proto=tcp:toport=8001:toaddr=103.236.240.72 --permanent
20 firewall-cmd --add-forward-port=port=1888:proto=tcp:toport=1888:toaddr=103.236.240.72 --permanent
21 firewall-cmd --add-forward-port=port=18888:proto=tcp:toport=18888:toaddr=103.236.240.72 --permanent
22 firewall-cmd --add-forward-port=port=9001:proto=tcp:toport=9001:toaddr=103.236.240.72 --permanent
23 firewall-cmd --add-forward-port=port=5007:proto=tcp:toport=5007:toaddr=103.236.240.72 --permanent
24 firewall-cmd --add-forward-port=port=8181:proto=tcp:toport=8181:toaddr=103.236.240.72 --permanent
25 firewall-cmd --add-forward-port=port=5622:proto=tcp:toport=5622:toaddr=103.236.240.72 --permanent
26 firewall-cmd --add-forward-port=port=10001:proto=tcp:toport=10001:toaddr=103.236.240.72 --permanent
27 firewall-cmd --add-forward-port=port=11001:proto=tcp:toport=11001:toaddr=103.236.240.72 --permanent
28 firewall-cmd --add-forward-port=port=11002:proto=tcp:toport=11002:toaddr=103.236.240.72 --permanent
29 firewall-cmd --add-forward-port=port=7001:proto=tcp:toport=7001:toaddr=103.236.240.72 --permanent
firewall-cmd --add-forward-port=port=818:proto=tcp:toport=818:toaddr=58.218.66.113 --permanent
firewall-cmd --add-forward-port=port=88:proto=tcp:toport=88:toaddr=103.236.240.72 --permanent
firewall-cmd --permanent --zone=public --remove-forward-port=port=88:proto=tcp:toaddr=58.218.66.113:toport=88 --删除转发规则
firewall-cmd --permanent --zone=public --remove-forward-port=port=88:proto=tcp:toaddr=103.236.240.72:toport=88 --删除转发规则
systemctl restart firewalld.service
firewall-cmd --list-all
firewall-cmd --add-forward-port=port=80:proto=tcp:toport=80:toaddr=58.218.66.113 --permanent
---数据库转发
firewall-cmd --add-forward-port=port=3307:proto=tcp:toport=3306:toaddr=103.236.240.81 --permanent
systemctl restart firewalld.service
firewall-cmd --list-all
iptables 端口转发
CentOS 7.0 以下使用的是iptables,可以通过iptables实现数据包的转发。
(1)开启数据转发功能
vi /etc/sysctl.conf
#增加一行 net.ipv4.ip_forward=1
//使数据转发功能生效
sysctl -p
(2)将本地的端口转发到本机端口
iptables -t nat -A PREROUTING -p tcp --dport 2222 -j REDIRECT --to-port 22
(3)将本机的端口转发到其他机器
iptables -t nat -A PREROUTING -d 192.168.172.130 -p tcp --dport 8000 -j DNAT --to-destination 192.168.172.131:80
iptables -t nat -A POSTROUTING -d 192.168.172.131 -p tcp --dport 80 -j SNAT --to 192.168.172.130
#清空nat表的所有链
iptables -t nat -F PREROUTING
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