Alright here is what I have setup

1 L4xNAT farm with ip of 1.1.1.1
protocol type tcp
nat type DNAT
load balance algorithm Weight
persistence mode IP persictence

3 backend servers on a separate subnet
2.2.2.1
2.2.2.2
2.2.2.3

gateways on these are set to 2.2.2.4 which is a second interface on my load 
balancer.

so something like this Client 1.1.1.100/21 —> ZEN 1.1.1.102/21 —> Server 
2.2.2.1/29


On Aug 27, 2014, at 10:22 AM, Gruber Alexander <[email protected]> 
wrote:

> Hi,
> 
> we need a lite bit more information.
> 
> Backendservers on a different network/sub network?Like this? 
> 
> Client --192.168.0.0/24 --> ZEN -- 192.168.1.0/24 --> Server
> 
>> Am 27.08.2014 um 18:00 schrieb "Jon Hoffart" <[email protected]>:
>> 
>> Hello,
>>   I currently have a L4xNAT farm setup to balance my mail servers. I am 
>> trying to use DNAT so I can identify were traffic is coming from, as NAT 
>> shows all traffic coming from the load balancer and not its original source. 
>> My issue with DNAT is that when I set the farm to use it I am unable to send 
>> or receive mail. I also tried running a port scan on the farms IP with DNAT 
>> enabled and it doesn’t return any open ports. Any ideas on what my cause an 
>> issue like this?
>> 
>> Yes my backend servers have their gateway set to that of the load balancer. 
>> 
>> 
>> 
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