>> solution: set mtu size of interface to a smaller value



C:\WINDOWS\system32>netsh interface ipv4 show subinterface

MTU Medienerkennungsstatus Bytes eingehend Bytes ausgehend Schnittstelle
------ --------------- --------- --------- -------------
1500 1 329087247 46687094 WLAN
1500 5 0 0 LAN-Verbindung* 2
4294967295 1 0 270372 Loopback Pseudo-Interface 1
1404 1 266411 76107 Hamachi


set mtu to 1280
>>>>> netsh interface ipv4 set subinterface Hamachi mtu=1280

>> to have the setting after reboot do a "store=persistent":
netsh interface ipv4 set subinterface $AdapterName mtu=1280 store=persistent


ps: see also: https://aktuelles.computer-fuechse.com/294/unitymedia-vpn-probleme-ipv4-ipv6-geloest.htm

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