[  367.063475] PPP generic driver version 2.4.2
[  367.064663] NET: Registered PF_PPPOX protocol family
[  367.067724] l2tp_core: L2TP core driver, V2.0
[  367.069117] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[  374.388854] iperf3 (9554) used greatest stack depth: 11512 bytes left
[  374.427936] ppp0: recursion detected
[  374.625543] ppp0: recursion detected
[  374.833549] ppp0: recursion detected
[  375.249563] ppp0: recursion detected
[  375.440374] ppp0: recursion detected