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SSH 連線不斷斷線

tag-icon • tag-icon linux networking ssh
SSH 連線不斷斷線

我已按如下方式設定 SSH 連線：~/.ssh/config在客戶端

ServerAliveInterval 1
ServerAliveCountMax 1200

並/etc/ssh/sshd_config在伺服器端：

ClientAliveInterval 5                                                                                                          
ClientAliveCountMax 1200

儘管如此，當登入遠端伺服器時，雖然我認為我的連線相當穩定，但我發現我的 SSH 連線在大約 15 到 60 秒後不斷中斷。ssh <server> -vvv總是以

...
debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype [email protected] reply 1
debug3: send packet: type 100
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 80
debug3: send packet: type 1
Connection reset by <IP> port <PORT>

在伺服器端：

...
debug3: receive packet: type 80                                                                                                
debug1: server_input_global_request: rtype [email protected] want_reply 1                                                  
debug3: send packet: type 82                                                                                                   
debug3: receive packet: type 80                                                                                                
debug1: server_input_global_request: rtype [email protected] want_reply 1                                                  
debug3: send packet: type 82                                                                                                   
debug2: channel 0: request [email protected] confirm 1                                                                     
debug3: send packet: type 98                                                                                                   
debug2: channel 0: request [email protected] confirm 1                                                                     
debug3: send packet: type 98                                                                                                   
debug2: channel 0: request [email protected] confirm 1                                                                     
debug3: send packet: type 98                                                                                                   
debug2: channel 0: request [email protected] confirm 1                                                                     
debug3: send packet: type 98
...

伺服器確實不斷重試。另外，我還可以並行下載某些內容，甚至打開到同一台伺服器的並行 SSH 連線。

但即使是短暫的中斷，為什麼 SSH 用戶端不繼續重試而是提前退出？如何配置 SSH（真正）繼續重試？

答案1

嚴格來說這不是我的問題的解決方案，但至少我可以透過在另一個 shell 中運行一個進程來解決這個問題，該進程每秒並行登入遠端伺服器，例如

 while true ; do ssh <server> "date; sleep 1s"; done

我不知道為什麼，但它有效地防止了我上面最初的問題中提出的問題。

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