Hello,
I've been reading for a couple days now and my mind has gone numb.
I'm hoping to get some help from the community, and I'm sure I'm just
overlooking something simple. My goal is to forward smtp traffic
destined for one machine to another based on source.
I have done this: echo 1 > /proc/sys/net/ipv4/ip_forward
I've enabled the loading of iptable_nat in the iptables config file.
This is the base of what I'm using in my /etc/sysconfig/iptables
file. Any direction on what I'm missing would be greatly appreciated.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [52442:19228811]
COMMIT
*mangle
:PREROUTING ACCEPT [60986:54771131]
:INPUT ACCEPT [60982:54770891]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [52445:19228943]
:POSTROUTING ACCEPT [52445:19228943]
COMMIT
*nat
:PREROUTING ACCEPT [1581:83538]
-A PREROUTING -s xxx.xxx.66.0/24 -i eth0 -p tcp -d xxx.xxx.64.3 --
dport 25 -j DNAT --to-destination xxx.xxx.65.15:25
:POSTROUTING ACCEPT [74:4438]
:OUTPUT ACCEPT [525:34512]
COMMIT
