서버가 너무 오래 유휴 상태 인 연결을 닫을 수 있습니다. 클라이언트 ( ServerAliveInterval) 또는 서버 ( ClientAliveInterval)를 업데이트 할 수 있습니다

 ServerAliveInterval
         Sets a timeout interval in seconds after which if no data has
         been received from the server, ssh(1) will send a message through
         the encrypted channel to request a response from the server.  The
         default is 0, indicating that these messages will not be sent to
         the server.  This option applies to protocol version 2 only.

 ClientAliveInterval
         Sets a timeout interval in seconds after which if no data has
         been received from the client, sshd(8) will send a message
         through the encrypted channel to request a response from the
         client.  The default is 0, indicating that these messages will
         not be sent to the client.  This option applies to protocol
         version 2 only.

서버를 업데이트하려면 (그리고 다시 시작합니다 sshd)

echo "ClientAliveInterval 60" | sudo tee -a /etc/ssh/sshd_config

또는 클라이언트 쪽 :

echo "ServerAliveInterval 60" >> ~/.ssh/config

답변

echo 'ServerAliveInterval 30' | sudo tee -a ~/.ssh/config
echo 'ServerAliveCountMax 1200' | sudo tee -a ~/.ssh/config

apt-get install arp-scan
arp-scan -I eth0 -l | grep 192.168.1.42
  192.168.1.42 d4:eb:9a:f2:11:a1 (Unknown)
  192.168.1.42 f4:23:a4:38:b5:76 (Unknown) (DUP: 2)