NAT firewalls like to time out idle sessions to keep their state tables clean and their memory footprint low.

NAT防火墻喜歡對空閑的會話進行超時處理，以確保它們狀態(tài)表的干凈和內存的低占用率。

Some firewalls are nice, and let you idle for up to a day or so; some are gestapo and terminate your session after 5 minutes.

一些防火墻比較友好，允許你的空閑會話時間為一天甚至超過一天；另一些卻如蓋世太保，5分鐘空閑就終止你的會話。

I finally got tired of my ssh sessions getting disconnected at places where I don't control the firewalls, and figured out how to stop it.

我最終疲于我的ssh連接會話被我不能控制的防火墻斷開，并找出了阻止它的方案。

Turn out ssh has a nice inband keepalive mechanism, and even lets you set it on a per-destination basis.

結論是ssh內帶有一個很好的保持會話存活機制，甚至允許你在每一臺目標機器上設置。

Just create a ~/.ssh/config file with something like the following (* will match any host, if you wanted you could restrict this to particular destinations like *kehlet.cx):

只要用以下類似的內容創(chuàng)建一個 ~/.ssh/config文件(＊號將匹配所有的主機，如果你想，你可以嚴格的設置它為特定的目標主機，像kehlet.cx)：

－－－－－－－－－－－－－－－－

Host *

ServerAliveInterval 240

－－－－－－－－－－－－－－－－

That's how often, in seconds, ssh will send a keepalive request (at the application layer) to the other end if the connection's been otherwise idle. 4 minutes should be good :-).

這通常是以秒為單位，如果這個連接空閑，ssh將發(fā)送一個保持存活的請求(在應用層)給另一端。4分鐘應該不錯。

The Host line lets you pattern match your destinations. Minimal effort, no impact to your system (say, as you would have if you mucked with your system's default TCP keepalive settings), and it works like a charm.

Host行使你匹配你的目標主機。極小的努力，對你的系統(tǒng)毫無影響(即，如果你弄亂你的系統(tǒng)默認TCP保持存活時間設置的話，將影響你的系統(tǒng))，并且很有效。

總結

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