Install iptables
$ sudo yum install iptables iptables-services iptables-utils
Configure iptables
Using NAT mode and forward the data packets:
$ iptables -t nat -A POSTROUTING -o eno1 -j MASQUERADE
$ iptables -A FORWARD -i eno1 -o eno2 -m state --state RELATED,ESTABLISHED -j ACCEPT
$ iptables -A FORWARD -i eno2 -o eno1 -j ACCEPT
Show all the NAT rules:
$ iptables -t nat -nvL
Save the iptables settings:
$ sudo iptables-save > /etc/sysconfig/iptables
$ sudo systemctl restart iptables
Configure Linux Kernel
$ sudo echo 1 > /proc/sys/net/ipv4/ip_forward
Append the following line in: /etc/sysctl.conf
:
net.ipv4.ip_forward = 1

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