Hi. I have a networking problem since after kernel 4.9.9 on. what happens is that when i have a ssh shell or ftp connection to my cubietruck it hangs after ca 1 minute. it happens only with ipv6 not ipv4. when it hangs i see with wireshark on my pc that there are ca 5 tcp retransmission retries after that the packets flow again. this takes ca 10 seconds. tcpdump on the cubie do not show packages in that time. if i add keepalives to the ssh there is no hang. firewall rules are all empty. cable is ok. no crc errors. did i miss something? greetings Markus Mitsch
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