Linux iptables maps multiple Intranet ftp servers in nat

Let's take a look.Linux iptablesAdd multipleFtpThe specific method of server ing.

The following two steps are involved:

1. First, convert the source addresses of the three ftp servers to those of the gateway.

192.168.0.254 is the gateway 10.0.0.0/24 is the network segment

Iptables-t nat-a postrouting-s 10.0.0.0/24 -- sport 20, 21-j SNAT -- to-source 192.168.0.254

If the gateway is a dynamic IP address

Iptables-t nat-a postrouting-s 10.0.0.0/24 -- sport 20, 21-j MASQUERADE

2. Convert the gateway Source Address to the Internet address

Iptables -- table nat -- append POSTROUTING-s 192.168.0.254-j SNAT -- to *. * (Public IP address published on the Internet)

3. Integration with dns

Iptables-t nat-a postrouting-s 10.0.0.0/24 -- sport 53-j SNAT -- to-source DNS Server IP

Through the article, we can easily see that the Linux iptables process is very simple to map multiple ftp servers in the nat network.

• Linux Iptables kernel added time module
• Linux Firewall Iptables entry notes
• Linux Iptables syntax
• Use iptables for static IP ing
• How to map all the Internet ports of iptables to a host on the Intranet
• Configure the Linux kernel and use iptables for port ing
• Specific iptables port ing operations