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From: Doug Hardie <bc979@lafn.org>
Date: Mon, 10 Jul 2006 00:44:21 -0700
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Cc: User Freebsd <freebsd@hub.org>
Subject: Re: Linksys router and ssh time outs ...
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On Jul 10, 2006, at 00:11, Ted Mittelstaedt wrote:

>
> From: "User Freebsd" <freebsd@hub.org>
>>
>> I just put a linksys router in place, so that we could use our  
>> wireless
>> laptop, well, wireless ... now, I seem to be getting timeouts on  
>> my ssh
>> connections when they are idle, but timeouts that I never received  
>> when I
>> had my desktop directly connected to the cable modem ...
>>
>> I've looked at the settings for the Linksys, and can't find  
>> anything that
>> might be related ... is there some keepalive that the linksys  
>> might be
>> blocking, or something else that I can do to keep the connection from
>> dropping?
>>
>
> Some of the Netgear routers allow you to telnet into the router and  
> change
> a config setting for the timeouts for specific protocols.  But I've  
> never
> heard the linksys allowing this.
>
> You might be lucky and your linksys might be one of the ones that can
> run an alternative firmware.  If so, flash it to one of the open  
> source
> firmwares and it should fix the problem.

You can also put lines like:

ServerAliveInterval 300
ServerAliveCountMax 3


in ssh_config.  That will cause ssh to send periodic alive messages.   
I use those to avoid the same problem.