That strange packed which has no reply from LwIP has a view:
pppol2tp: input packet, len=20, tunnel=53427, session=0, ns=2, nr=4
Data input: c8 02 00 14 d0 b3 00 00 00 02 00 04 80 08 00 00 00 00 00 06 

We connected to VPN-server using Windows and found almost the same message:
                 c8 02 00 14 00 15 00 00  00 04 00 04 80 08 00 00 00 00 00
06
Wireshark app says it is "Control message - Hello".



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