[  370.770115] PPP generic driver version 2.4.2
[  370.771009] NET: Registered PF_PPPOX protocol family
[  370.773525] l2tp_core: L2TP core driver, V2.0
[  370.774636] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  378.032356] iperf3 (9473) used greatest stack depth: 11560 bytes left
[  378.045820] ppp0: recursion detected
[  379.052235] ppp0: recursion detected