[  368.552659] PPP generic driver version 2.4.2
[  368.554014] NET: Registered PF_PPPOX protocol family
[  368.556796] l2tp_core: L2TP core driver, V2.0
[  368.557912] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  375.868609] iperf3 (9472) used greatest stack depth: 11520 bytes left
[  375.893752] ppp0: recursion detected
[  376.457173] ppp0: recursion detected
[  376.904532] ppp0: recursion detected