Postfix Smtp Outgoing IP Rotator using iptables
This is the scheme
e.g:
I got 5 Public IPs. i’m Gonna configure them, so Postfix can use multiple interfaces/ips for outgoing smtp connections.
First we need creating Interface aliases for those 5 public IPs.
In my system, using fedora:
# cd /etc/sysconfig/network-scripts/ # cp ifcfg-eth0 ifcfg-eth0:1
Edit ifcfg-eth0:1
# vi ifcfg-eth0\:1 DEVICE=eth0 <-- default device HWADDR=XX:XX:XX:XX:XX:XX ONBOOT=yes TYPE=Ethernet BOOTPROTO=none IPADDR=202.XXX.XX.2 <-- default eth0 IP address PREFIX=24 GATEWAY=202.XXX.XX.1 DNS1=202.XXX.XX.XX
Change DEVICE and IPADDR parameters
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