Ted I've been wondering why I have had problems and you don't. I'm also behind a router and the windows computer also has the ZoneAlarm firewall but that has not seemed to stop the DOS attacks. It's not a D-Link (Ugate 3000) but I've looked at the D-link and others and they are all pretty much the same.
I'm experimenting with a new system that may eliminate the "unwanted connections from various unknown urls". It's a Linux system with a very cool program called Win4Lin which allows you to actually _install_ Windows 98 so that it and windows programs are actually running under Linux - but they don't really know it. The best thing is that Windows then uses the networking facilities of Linux including a special "stateful" firewall that only allows connections to come in from the Internet if "related" to something I have initiated. This may stop all the DOS type interference because they are all initiated from the outside and should not be permitted through the firewall. It's running now and I should know in a day or so. My goal is to end up with a Telnet connection for spots that runs for weeks at a time! 73, Larry N2LA On Tue, 05 Nov 2002 09:46:03 -0500, Ted Sarah - W8TTS wrote: >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: [EMAIL PROTECTED] >> > >> >> 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 >> >> _______________________________________________ >> Dx4win mailing list >> Dx4win@mailman.qth.net >> http://mailman.qth.net/mailman/listinfo/dx4win >_______________________________________________ >Dx4win mailing list >Dx4win@mailman.qth.net >http://mailman.qth.net/mailman/listinfo/dx4win Larry Alkoff N2LA - Austin TX
