Iptables NAT in centos

How see Iptables NAT LIST

iptables -t nat -L

Allow Forward TarffiC for Ethernet

iptables -A FORWARD -i eth0 -j ACCEPT
iptables -A FORWARD -o eth0 -j ACCEPT

For Any Source Ouput From Interface eth0

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Masquarde Range 192.168.1.0/24 on Eth3

iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth3 -j MASQUERADE

https://www.slashroot.in/linux-nat-network-address-translation-router-explained
https://mirrors.tripadvisor.com/centos-vault/4.4/docs/html/rhel-sg-en-4/s1-firewall-ipt-fwd.html