[Dxspider-support] Telnet connection keep alive

[jarmo]

Sun, 13 Nov 2016 13:23:18 +0000
Dirk Koopman via Dxspider-support <dxspider-support at dxcluster.org>
kirjoitti:

> 
> It is rarely seen these days :-)

Not seen any :)
> 
> Any traffic, in either direction, will delay the prompt, but is there
> is no traffic for $user_interval seconds on your link, then it will
> send a command prompt. Set/ping for nodes serves roughly the same
> purpose.
Does spider think, that it has send spot, even it is filtered and does
not send prompt?

When I have set filter, to reject those ego,please, 59, please spots
and also rtty/data, I get quite small amount of spots. Early morning
hours, there's less spots anyway.

Now, in this situation connection becomes "zombie" I see, I have
connected, but nothing happens, when sending something to cluster and
no prompt can be seen either. I have noticed, that my routers firewall
blocks out for some reason this telnet connection. It seems, that my
client (cqrlog) should send something, to keep connection alive... Or,
like I did, I took my linux firewall in use and bridged router channel.
There's some other users also seen this happen.

Jarmo


> Dirk
> 
> On 13/11/16 03:59, jarmo via Dxspider-support wrote:
> > Now have tested connection and noticed that it is my routers
> > firewall, what makes connection as "zombie", when there is not
> > much spots in early morning hours.
> >
> > I bridged my router channel and use my linux firewall and it seems,
> > that connection does not drop into "zombie".
> >
> > Dirk, could you explain "$user_interval", is it just probe
> > with no data and waiting "ACK" response? Or is it some kind of
> > ping?
> >
> > Seems, that these router firewalls blocks quite roughly traffic :)
> > So, may need some kind of data, to keep connection alive?
> >
> > Jarmo, oh1mrr
> >
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> 
> 
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