Hi Andrew, On Tue, Feb 11, 2020 at 11:47:04AM +0100, goldsi...@gmx.de wrote: > Am 11.02.2020 um 10:20 schrieb Andrew Pullin: > > [..] > > > > The part that I am stuck on presently is that Host2 has no knowledge of > > how to route packets from PPP out to the WAN, say, 8.8.8.8. > > Between ip4_forward, IP_FORWARD, ip4_route_src, LWIP_HOOK_IP4_ROUTE, > > LWIP_HOOK_IP4_ROUTE_SRC, and the ESP32 port modifications, I am not > > quite sure where to make the right intervention. It is ... a lot to take in. > > > > As far as I understand the standard usage of the stack for a single > > netif, outgoing packets elide the entire forwarding/routing system > > because they are specified to be transmitted on a particular netif? Is > > that right? > > > > Fundamentally, I only have eth0 and pp1 (to use the lwip netif naming > > system) and anything not specifically with IP dest = eth0 or pp1 should > > be sent on towards Host2's gateway (after NAT source address IP rewriting). > > Is that logically complete, and if so, where should it be implemented? > > I would think you'd just set the ppp netif as default netif (so it is > just used for all outgoing trafic where no better route is found) and > keep eth0 without a gateway (which should ensure only matching subnet > packets are transmitted on this netif).
Yes, but the default netif (default route) must be set on eth0, not pp1 :) Sylvain
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