eth5 192.168.100.254 #Main IP
eth5:2 192.168.100.2 #Virtual IP1
eth5:3 192.168.100.3 #virtual IP2
....
....
eth4:14 192.168.100.14 #virtual IP14

eth1: 192.168.100.1 #Main IP for LAN
eth2: 219.91.xxx.185 #Main Public IP
eth2:2 219.91.XXX.2 #sub public IP2
...
...
eth2:14 219.91.xxx.14 #sub public IP14

**Input**

-A INPUT -i eth1 -j ACCEPT
-A INPUT -i eth2 -j ACCEPT

**Forward**

-A FORWARD -i eth1 -o eth2 -j ACCEPT
-A FORWARD -i eth2 -o eth1 -j ACCEPT

**DNAT**

-A PREROUTING -d 219.91.xxx.186/32 -j DNAT --to-destination 192.168.100.254
-A PREROUTING -d 219.91.xxx.3/32 -j DNAT --to-destination 192.168.100.3
-A PREROUTING -d 219.91.xxx.2/32 -j DNAT --to-destination 192.168.100.2
...
...
-A PREROUTING -d 219.91.xxx.14/32 -j DNAT --to-destination 192.168.100.14

**SNAT**

-A POSTROUTING -s 192.168.100.254/32 -j SNAT --to-source 219.91.xxx.186
-A PREROUTING -d 219.91.xxx.3/32 -j DNAT --to-destination 192.168.100.3
-A PREROUTING -d 219.91.xxx.2/32 -j DNAT --to-destination 192.168.100.2
...
...
-A PREROUTING -d 219.91.xxx.14/32 -j DNAT --to-destination 192.168.100.14

cat /etc/mailips
example.com 192.168.100.4

cat /var/cpanel/cpnat
192.168.100.6 219.91.xxx.6