[Python-Dev] stdlib socket usage and "keepalive"

[Jesus Cea]

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On 04/13/2010 12:09 AM, Guido van Rossum wrote:
> Also I recall reading that keepalives are a very
> controversial concept (since they may actually break connections
> unnecessarily if the internet merely has a hiccup).

That is true, but parameters are usually very conservative.

In standard Ubuntu box I host out there, the (default) parameters used
(if I activate keepalive):

+ Send the keepalive only after 1800 seconds of complete connection
inactivity.

+ After starting sending keepalives, send NINE probes.

+ Between probes, wait at least 75 seconds.

So you have to have 30 minutes of idle and then at least 11 minutes of
no conectivity to "lose" the connection.

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