linux Shared Network setup example details

linux shares web surfing Settings

1. Open kernel ip forwarding

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

Execute ES9en-p into effect

2. If firewall is not enabled on the host, 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
 or 
           iptables -t nat -A POSTROUTING -s ip -o eth0 -j MASQUERADE  
 
// To specify a ip or ip Segments can be forwarded 
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
 Description: 
 iptables -F # Remove the original filter Rules in place  
 iptables -t nat -F # Remove the original nat Rules in a table 
 iptables -P FORWARD ACCEPT # The default allows IP forwarding 

If firewall is enabled on the host, 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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