redirect traffic based on destination port to another interface

[Julian Elischer]

Rudy Setiawan wrote:
> can you run two instances of natd?

yes.

you can even get natd to run two separate translation sets but I hav enever done it.
(phk added code to allow that some time ago I believe)

of course you don't need that if you have NAT devices on each link anyway.
($40 each..)


> 
> Thank you.
> 
> Regards,
> Rudy
> 
> 
> On 8/3/07, Julian Elischer <julian at elischer.org> wrote:
>> Rudy Setiawan wrote:
>>> On 8/2/07, Julian Elischer <julian at elischer.org> wrote:
>>>> Rudy Setiawan wrote:
>>>>> Hi,
>>>>>
>>>>> I am trying to do a traffic redirection based on destination port to
>>>>> another interface/gateway.
>>>>> Currently, I have a freebsd box that does simple NAT and an Internet connection.
>>>>> I am planning to install another internet connection and use the same
>>>>> box to do some traffic redirection.
>>>>>
>>>>>
>>>>> INTERNET1 -------- freebsd box ------- INTERNET2
>>>>>                                  |
>>>>>                                  |
>>>>>                        Local Area Network
>>>>>
>>>>> LAN = 192.168.10.0/24 with interface em0
>>>>> INTERNET1-GW = x.x.x.1 with em1
>>>>> INTERNET2-GW = y.y.y.1 with rl0
>>>>>
>>>>> My goal is to redirect any ssh traffic to INTERNET2-GW and I assume
>>>>> that if it can be redirected through INTERNET2-GW then the packets
>>>>> return will go through INTERNET2-GW also.
>>>>>
>>>> no, unless you first NAT the packets with the address of that interface.
>>>> (otherwise the packets will come back through your primary network).
>>>> if yo have cheep dlink or linksys or whatever DSL routers or whatever with NAT
>>>> on them then you can use that successfully and just use ipfw 'fwd' rules to select the interface to use.
>>> I see, hmm are you suggesting that the linksys should be placed
>>> between the freebsd firewall and the internet? Then do a ipfw fwd
>>> rules to in freebsd to select which interface to go and linksys will
>>> do all the NAT-ing for those packets respectiveily right?
>> exactly
>>
>>> Thank you.
>>>
>>> Regards,
>>> Rudy
>>
> 
>