[zeromq-dev] Heartbeating using TCP keepalives

Alex Grönholm alex.gronholm at nextday.fi
Fri Jan 3 18:58:56 CET 2014

03.01.2014 14:45, Bjorn Reese kirjoitti:
> On 01/03/2014 02:03 AM, Alex Grönholm wrote:
>> As it stands, the TCP keepalive intervals are given in seconds on the
>> vast majority of operating systems.
> Furthermore, if the peer is unresponsive then additional probes will be
> sent at regular intervals before the TCP keepalive mechanism reports a
> timeout. The details are also dependent on the operating system. For
> instance, on some BSD derived TCP stacks, 9 probes will be sent 75
> seconds apart, so a timeout will not be reported until 11 minutes and
> 15 seconds have passed.
That is exactly why the parameters are configurable on a per-socket basis!
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