Hello Simon, On Thu, Apr 10, 2014 at 08:12:00PM +0200, Simon Goldschmidt wrote: > Sylvain Rochet wrote: > > Oh dear, now I see what is happening. > > > > PPP header is smaller than Ethernet header > > [..] > > This is actually a lwIP design issue, the only way we can fix that is by > > adding a configuration option so pbuf from PPP are allocated with enough > > extra space so a Ethernet header will fit in place of a PPP header. > > The lwIP way to solve this is to defin PBUF_LINK_HLEN to be big enough > for both sides. We do waste some bytes that way, but it should work. > > However, I just saw that PPP (new?) seems to allocate many pbufs as > PBUF_RAW, which kind of breaks the link-header size calculation and > thus might make my suggestion not work... > > Anyway, we might want to fix this in a generic way...
PPPoE use PBUF_LINK, PPPoL2TP use PBUF_TRANSPORT, PPPoS use PBUF_RAW, it all makes sense at first sight and IP forwarding should work for PPPoE and PPPoL2TP. Maybe we should allocate a PBUF_LINK for PPPoS as well. Sylvain
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