Transparent redirect to another interface ?

Frank Bonnet f.bonnet at
Fri Feb 23 10:43:13 UTC 2007

Daan Vreeken [PA4DAN] wrote:

> "natd" can be used to do this.
> The following example assumes your external interface is called "sk0" and the 
> seconde interface, connecting to the second server, is called "sk1" :
> # Start natd and tell it to forward pop3 traffic to the second server
> natd -n sk0 -redirect_port tcp ip_of_second_server_here:110 110
> # Add ipfw rule to send incoming pop3 traffic through natd
> ipfw add 1000 divert natd tcp from any to me 110 via sk0
> # Add ipfw rule to send responses from second server through natd
> ipfw add 1010 divert natd tcp from ip_of_second_server_here 110 to any via
>    sk0
> # or just use one ipfw rule :
> ipfw add 1000 divert natd all from any to any via sk0
> But this will send ALL traffic through natd, only sending traffic that needs 
> to be redirect through it is far more efficient.
> Hope this helps,

Good idea but I would prefer (if possible)
to use some kind of ethernet trunking .

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