[K12OSN] Outside access to K12ltsp intermittently cut off
pfaffman at gmail.com
Thu Sep 9 02:27:50 UTC 2004
I've had a similar problem and the explanation was that another
machine was using the same IP. With lots of switches the problem was
harder to find because from some machines machines would go to the
right machine and others to the rogue machine. Use arp to see if
you're hitting the machine you think you are.
On Wed, 8 Sep 2004 17:30:38 +0200, Henning Bertelsen
<k12ltsp at ramsele.dyndns.org> wrote:
> I use shorewall too, and I had the same problem when connecting through a
> dial upp ISP.
> Shorewall is blocking some IP adresses in the /etc/shorewall/rfc1918 file.
> I commented out IP adresses beginning with 82, 84, 88, and 96, then did a
> "shorewall restart".
> Check your /var/log/messages file to see if you find something like
> shorewall:rfc1918:DROP at the time you try to log in.
> What Ip adress do you have when it does not work?
> Anyway a better forum would probably be the shorewall mailing list, You can
> find it at http://www.shorewall.net.
> ----- Original Message -----
> From: "Duane Wilson" <aaa at pacifier.com>
> To: <K12OSN at redhat.com>
> Sent: Tuesday, September 07, 2004 9:48 PM
> Subject: [K12OSN] Outside access to K12ltsp intermittently cut off
> > This may not be the right forum for this question. If anyone can think
> > of a better place to ask this question feel free to advise.
> > I use ssh remotely to administer a K12ltsp system
> > Sometimes I can ssh in, sometimes I get no response with ssh or ping to
> > that address. An hour or two later it works without any intervention.
> > My firewall/router/squid/dansguardian box is an older Compac proliant G2
> > server with 2 nics. One nic faces my ISP with a static IP address.
> > The other nic faces my K12ltsp server.
> > The firewall box is running shorewall for my iptables rules generator.
> > Wierd thing is that even when it won't respond to anything from outside
> > it still works fine for internet access from inside!
> > I have been fighting this problem for a year. It happened with K12ltsp
> > 4.0 and continues with a fresh install of 4.1
> > I have asked local linux gurus and gotten nothing more than scratching
> > heads and blank looks.
> > Anyone have any idea what I might try to diagnose this?
> > Thanks,
> > Duane Wilson
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Jay Pfaffman <pfaffman at utk.edu>
Asst Professor of Instructional Technology, U. TN, Knoxville
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