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Re: [lwip-users] forwarding and NAT

From: Sylvain Rochet
Subject: Re: [lwip-users] forwarding and NAT
Date: Wed, 4 Feb 2015 16:48:09 +0100
User-agent: Mutt/1.5.21 (2010-09-15)


On Wed, Feb 04, 2015 at 04:19:39PM +0100, Marleen Vos wrote:
> Now I know NAT is out of the question, I could put my question in
> another way:
> The situation I have in mind is to use an embedded device as a
> router, with ethernet on one end, and serial on the other end
> (connected to GPRS).
> There can be multiple devices connecting over the ethernet link, so
> the forwarding would actually need to be able to work in this
> situation too.
> A connection coming in over the serial link would need port
> forwarding to reach the correct address behind the router. Is that
> possible with lwip?

Maybe I was unclear, lwIP does not (currently) support NAT at all.

> Devices making a connection from the ethernet side, have to be
> forwarded to the serial side. Will this forwarding work for multiple
> devices without (stateful)NAT? I would think not, but I'm not sure
> on this.

I don't follow you, there is no such concept of "connection" for IP 
forwarding because this is working on the IP level. Are you confusing IP 
forwarding and NAT ?


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