Trying to understand audisp-remote network behavior

[Lenny Bruzenak]

On 7/12/22 12:57, Ken Hornstein wrote:

>>> Well, the default configuration is that heartbeats are turned off, so
>>> the general impression I would take away from that is you should only
>>> turn on heartbeats if you have some unusual requirement.
>> This has to be coordinated between the client and server as many of these
>> setting need to be. I can add some discussion to the man page that this is
>> recommended.
> Errr ... does it?
>
> I certainly turned them on all of our clients but did not on turn
> them on our server.  Did not cause any problems.  I mean, yes, I could
> see that turning them on the server might be helpful, but it doesn't
> seem to be required to make them work; from my reading of the code that
> the server will respond to a heartbeat message whether or not they
> are configured, and since connections all initiate from the clients
> that's the end that has to notice the connection has dropped.

I think what Steve was referring to is the tcp_client_max_idle setting, 
which has a man page item saying it needs to be higher than the 
heartbeat setting on the sending side.

>
> And yes, some additional documentation might be helpful.  Like if there
> was a note in the man page that said, "Enabling heartbeats is the only
> way to ensure that a connection will be retried if it is lost", that
> might have clued me in that heartbeats are essentially required for
> reliable connectivity (I am assuming we all agree that statement is
> true; as far as I can tell, even with the latest code it still is!).

This may be true, doubtful it is the intent.

LCB

-- 
Lenny Bruzenak
MagitekLTD