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Example analysis of Linux shared Internet settings

黄舟
黄舟Original
2017-06-01 11:02:221114browse

This article mainly introduces the related information of linux Shared Internet Settings Examples. Friends in need can refer to

Linux Shared Internet Settings

1. Turn on kernel ip forwarding

vi /etc/sysctl.conf 
 
net.ipv4.ip_forward = 1

Execute sysctrl -p to take effect

2. If the firewall is not enabled on the host, then set iptables as follows

[root@Web-Lnmp02 ~]# iptables -F
[root@Web-Lnmp02 ~]# iptables -P INPUT ACCEPT
[root@Web-Lnmp02 ~]# iptables -P FORWARD ACCEPT 
[root@Web-Lnmp02 ~]# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
或者
           iptables -t nat -A POSTROUTING -s ip -o eth0 -j MASQUERADE  
 
//指定某ip或ip段可以转发
iptables -t nat -A POSTROUTING -s 192.168.0.170 -o enp1s0 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o enp1s0 -j MASQUERADE
 
 
[root@Web-Lnmp02 ~]# /etc/init.d/iptables save
[root@Web-Lnmp02 ~]# /etc/init.d/iptables restart
说明:
 iptables -F #清除原有的filter有中的规则 
 iptables -t nat -F #清除原有的nat表中的规则
 iptables -P FORWARD ACCEPT #缺省允许IP转发

If the firewall is enabled on the host, you need to add the following two sentences:

Code:

iptables -A FORWARD -s 192.168.122.0/24 -o eth0 -j ACCEPT 
iptables -A FORWARD -d 192.168.122.0/24 -m state --state ESTABLISHED,RELATED -i eth0 -j ACCEPT


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