[  383.839062] PPP generic driver version 2.4.2
[  383.840038] NET: Registered PF_PPPOX protocol family
[  383.842620] l2tp_core: L2TP core driver, V2.0
[  383.843567] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  388.348316] iperf3 (9669) used greatest stack depth: 11776 bytes left
[  388.387903] ppp0: recursion detected
[  389.405754] ppp0: recursion detected