[volunteergrid2-l] [ej3fw] connection timeouts

[Shawn Willden]

Great work, Brian!

I've added the keepalive to my configuration.  I'll watch it for a bit to
see if the behavior looks good.

On Sun, Mar 25, 2012 at 11:40 PM, Brian Warner <warner at lothar.com> wrote:

>
> I did some brief digging this afternoon, uploading small files and
> watching with a packet sniffer. I was connected to 15 out of 17 servers
> (all but ianchov's [aty4r] and slush-backup's [2na4j]).
>
> One thing I observed was that my connection to stercor's server (ej3fw)
> was dropping and reconnecting about once every 16 minutes. I noticed
> this by looking at the "Since" column on the welcome page's server list:
> it shows a timestamp of a few seconds after node reboot for most
> servers, but that one server showed a fairly recent timestamp, changing
> every once in a while.
>
> I think I figured it out, and have a workaround (as well as notes on
> tools to build to help diagnose the issue more easily). I'll write a
> longer letter to the tahoe-dev list with the details, so everyone can
> see them. For VG2's purposes, my advice is to do at least one of:
>
>  1: add [node]timeout.keepalive=120 to all client's tahoe.cfg
>  2: have stercor add timeout.keepalive=120 to the server's tahoe.cfg
>  3: have stercor reconfigure the NAT/router box to increase the timeout
>    for "idle" TCP connections to at least 10 minutes (it currently
>    might be set to more like 5 minutes)
>
> I this this might explain a few problems, but I've certainly seen others
> that this doesn't account for. I'll keep digging.
>
> cheers,
>  -Brian
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-- 
Shawn
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