[  381.953468] PPP generic driver version 2.4.2
[  381.954489] NET: Registered PF_PPPOX protocol family
[  381.956673] l2tp_core: L2TP core driver, V2.0
[  381.959221] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  386.427092] iperf3 (9671) used greatest stack depth: 11496 bytes left
[  386.464432] ppp0: recursion detected
[  386.700544] ppp0: recursion detected
[  387.481065] ppp0: recursion detected