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Re: [lwip-users] routing over PPP using lwip

From: Sylvain Rochet
Subject: Re: [lwip-users] routing over PPP using lwip
Date: Wed, 13 May 2015 10:59:01 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Hello Damien,

On Tue, May 12, 2015 at 11:33:23PM +0000, COOKE, Damien wrote:
> We have a system that we are using lwip for our tcp engine.  It is a 
> system without an OS running on ARMV9 hardware.  It has a tcp 
> connection to a server and a ppp connection to a peripheral client 
> device.  The tcp connection to the server is faultless and the PPP 
> connection comes up fine we can see ping packets between the client 
> and the system over the ppp connection but we are unable to send 
> packets over the ppp connection.  I suspect a routing issue and was 
> wondering if anyone else had seen something like this and if someone 
> could guide me as to where I should be looking to find my issues?

Which lwIP version are you using ?

Which PPP link protocol are you using ? PPPoS ? PPPoE ? PPPoL2TP ?

Are you trying to do SNAT ? lwIP doesn't support NAT at all.

Is LwIP IP routing enabled ?

Note that IP routing between Ethernet and PPPoS was recently fixed in 
git master head.


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