[  380.911723] PPP generic driver version 2.4.2
[  380.912757] NET: Registered PF_PPPOX protocol family
[  380.916380] l2tp_core: L2TP core driver, V2.0
[  380.917566] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  385.355707] iperf3 (9611) used greatest stack depth: 11808 bytes left
[  385.392520] ppp0: recursion detected
[  385.684134] ppp0: recursion detected
[  386.402845] ppp0: recursion detected