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Re: [lwip-users] VPN Client for incoming PPP connection

From: Simon Goldschmidt
Subject: Re: [lwip-users] VPN Client for incoming PPP connection
Date: Fri, 4 Feb 2011 16:19:30 +0100

Marco Jakobs <address@hidden> wrote:

> Is there a VPN implementation for LwIP or has anybody realized this?

I didn't hear of one, yet.

> Will it generally be possible to do this with LwIP


> (what support of the stack will be needed for this?)?

That highly depends on the type of protocol you want to use... Some protocols 
can be implemented using a new netif driver, some have to pass their structures 
trough UDP an IP again (and that might not be supported out-of-the-boxx by 

> At least, how many ressources must be available for such an extension?

Again, that highly depends on the protocol. Keeping control structures aside, 
the main resource burner will be encryption (if used). Also, the protocol 
overhead will be bigger because now, additional headers will travel through the 
line and thus, user data per packet will be smaller.

> Any thoughts are highly appreciated ... ;-)

Depending on your requirements, you might want to consider using a tunnel 
protocol (like PPTP, I think) instead of using a full featured VPN protocol 
(like IPSec). However, I haven't implemented any of them, so I cannot tell 
which is the easiest :-)


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