[Dx4win] Staying Connected to TELNET

[Ted Sarah - W8TTS]

I use DX-Telnet through a cable modem (Road Runner) and don't have any
problem staying connected.  I did earlier, do to the way it was
connected to my laptop, but that's another issue.  I have the clusters
that I use, set up to be pinged every 10 minutes as a keep alive. 
And, it works like a charm.

To stop the "unwanted attempted connections from various unknown
urls", I use a D-Link Cable/DSL Internet Gateway between the cable
modem and the PC.

73 - Ted - W8TTS


Larry Alkoff wrote:
> 
> On Mon, 4 Nov 2002 21:05:25 -0800, STU wrote:
> 
> > Is there anyone out there that has a hard time staying connected
> > to TELNET.
> > I have a high speed cable connection that works great for the
> > Internet. No problems!
> > When connecting to a DX cluster via TELNET (with DX4WIN) and the
> > activity is somewhat slow, I seem to get disconnected. During
> > peak times such as contests I stay connected just fine. I
> > understand there is a so called "keep alive" option either in
> > DX4WIN or some other outside source. The idea is to keep the
> > traffic moving. If windows isn't seeing any traffic from you,
> > (some ISP's as well.) disconnect you so others can use the IP
> > you were on. Is there a setting in DX4WIN using the TCP/IP
> > setting with this so called "keep alive" feature? Please advise. TNX, 73 STU
> >
> >Please respond to: w6yyy@arrl.net
> >
> 
> I have noticed that normally I lose my connection in about an hour.
> 
> My experiments indicate that the reason is that somehow Telnet
> attracts a swarm of attempted connections from various unknown
> urls that overload the ability of Telnet to keep itself alive.
> 
> Various methods of sending "keep alive" signals have made no
> difference.
> 
> I maintain two machines - one is Linux.  If I establish a Telnet
> connection under DX4Win and set the Linux machine to monitor
> connections using "tcpdump" which is included in most Linux
> distributions, I can clearly see the attempted connections building
> up - to as many as hundreds per second!
> 
> This is a classic DOS (Denial of Service) attack.  Most people
> would be unaware of the attack unless they are running an analysis
> tool like tcpdump.
> 
> I've tried nearly a dozen different Telnet sites - the result has
> always been the same.
> That is why I'm looking for a good http site that does automatic
> refreshes.
> 
> My connection is a 24 hour cablemodem (Time-Warner of Austin TX
> RoadRunner) and I think that kind of connection is attractive to
> the kind of people doing this.
> They can easily tell it's Time-Warner from the first few digits of
> the IP address.
> 
> Many have complained about the difficulty of keeping their Telnet
> connection "up".
> Hope this information helps others.
> 
> Larry Alkoff N2LA
> 
> Larry Alkoff N2LA - Austin TX
> 
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