[Dxspider-support] Telnet connection keep alive

[Dirk Koopman]

The $user_interval is an "original feature" that is designed to make 
sure that ax25 NETROM links don't time out on nil traffic after (IIRC) 
12 minutes. It has the side benefit for telnet and other TCP/IP users 
(using logging programs) in that one gets a standard command prompt 
every (default) 11 minutes to show that the connection is still up - 
just not very busy.

It is rarely seen these days :-)

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.

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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