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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
Yes.
> (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
lwIP).
> 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 :-)
>
Simon