[  367.111561] PPP generic driver version 2.4.2
[  367.112507] NET: Registered PF_PPPOX protocol family
[  367.114699] l2tp_core: L2TP core driver, V2.0
[  367.115617] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  374.403873] iperf3 (9617) used greatest stack depth: 11496 bytes left
[  374.420661] ppp0: recursion detected
[  374.922663] ppp0: recursion detected
[  375.428053] ppp0: recursion detected