help with iptables

[Dave Cramer]

On 19-Jan-07, at 11:54 AM, John Van Ostrand wrote:

> On Fri, 2007-01-19 at 10:56 -0500, Dave Cramer wrote:
>
>> So what I'd like to do is  using iptables :
>>
>>
>> route port 25 traffic currently going to B --> A except when it comes
>> from A
>
> You have two options.
>
> If the port 25 traffic that you want to NAT is always coming in  
> from one
> interface and system A is on another then use the --in-interface
> iptables option to specify the external interface.
>
> If you can't differentiate based on interface then you'll have to  
> go to
> policy routing. See iproute2 to create a separate routing table for  
> the
> traffic. You may also need to use iptables MANGLE table to mark  
> packets.
>
The solution was somewhat simpler...

simply port forward the new spam filter to the old one, change the mx  
and then remove the port forwarding for testing.

Sometimes looking at the problem from the reverse is better.

Dave
>
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