On Thu, Mar 26, 2026 at 04:26:23PM +0800, Qingfang Deng wrote: > Hi Sebastian, > > On Thu, Mar 26, 2026 at 4:13 PM Sebastian Andrzej Siewior > <[email protected]> wrote: > > > > On 2026-03-26 10:16:24 [+0800], Qingfang Deng wrote: > > > Add ping and iperf3 tests for ppp_async.c and pppoe.c. > > > > Oh thank you for doing this. > > I haven't look in detail but this cover the "invalid loop" cases that > > ppp tries to catch? > > By "invalid loop", do you mean transmit recursion? > https://lore.kernel.org/all/[email protected]/ > > AFAIK, this can only happen with PPTP or L2TP, which were not included > in this patch.
The problem was originally reproduced using L2TP, indeed. But I guess that it could also be reproduced with PPPoE by using a UDP tunnel device like VXLAN (like sending a packet through a PPP interface, handled by PPPoE, running on top of a VXLAN device, that routes the UDP encapsulated packet back to the original PPP interface). > Add Cc: Guillaume Nault > > > Regards, > Qingfang >
