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tcp/ip isp changes?

Started by Dave Palmer, 2009.09.09, 07:49:15

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Dave Palmer

Maybe it is the weather, or maybe it is the lack of solar flares - I don't know, but suddenly computing isn't fun this week.

Need some advice on why an operational OS/2 system should suddenly lose access to specific websites.  I've been maintaining them for years.

Two in particular are www.oakvilleschools.org   and/or www.oakville-wa.org

The isp admits they had a problem earlier today or yesterday.  It is fixed they say.

On my wife's XP system using the same DSL modem I can access either site.  On my OS/2 system I cannot.  I couldn't this morning before I installed a new firewire card and I can't tonight.  The firewire card is independent of this all, as I had a firewire card installed before, and things worked then.

By the way FTP access fails as well.

I've cleared my history and cache-  the DSL modem was reset.

I can access all manner of other sites - only those on dot5hosting.com give me trouble and I don't know how to solve it at my end.

You folks are my only access to OS/2 help and I appreciate any advice.

Thanks,
Dave



RobertM

Try this from an OS/2 command line.

host www.oakville-wa.org

If that fails, try this:

nslookup www.oakville-wa.org 198.6.1.2

If that passes, then the DNS servers that OS/2 is talking to do not (yet) have the DNS info for the site. That would mean that the OS/2 box is simply using different DNS servers than the Windows one, and when the DNS info propagates everywhere, the issue will resolve itself.


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Dave Palmer

Robert,
Thanks for the fast help.  I appreciate it.

Both tips worked.  I don't know how to understand the results (which differ).

Here are the results - does the difference make a real difference?


[C:\]host www.oakville-wa.org
www.oakville-wa.org =   66.96.133.25

[C:\]nslookup www.oakvile-wa.org 198.6.1.2
Server:  cache01.ns.uu.net
Address:  198.6.1.2

Non-authoritative answer:
Name:    www.oakvile-wa.org
Addresses:  63.251.179.49, 64.158.56.49

DOT5 had me do a tracerte on both machines.  That output, other than format, appeared identical.

Time to beam-me-up

Dave

p.s. I changed my  nameserver addresses on the "Hostnames" of the TCP/IP Configuration tabs to the same values on the XP machine.  Rebooted and retried and no improvement.   the 'host' and 'nslookup' output comes from after the reboot.

RobertM

Try changing the machine's IP to the same one as the XP machine (with the XP machine off) and see if you can connect to those services (web/ftp).

Sorry so brief, but busy at work.

-R


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Kirk's 5 Year Mission Continues at:
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Dave Palmer

Robert -
128ip.com reports both systems with an ip address of 67.42.90.22, which is what theDSL modem shows as its' IP address.

In our setup we both access the DSL modem via Buffalo AirStation wireless unit.  We're hardwired to the Buffalo.

Now when it comes to doing what you asked I am stymied.  All this makes the underlying issue more complex than it really is, but that's the advantage to fog - things get hidden.

On a related note - I have swappable drives on this machine - Warp and XP.  When I swapped to XP there was no problem accessing the sites - I mention this simply to totally eliminate hardware related issues.

If I loved XP this wouldn't be a problem. 

Thanks again,
Dave

Andi

Could this be a -mtu problem? AFAIR I had issues with some sites long ago when my -mtu size was to big.

Pete

Hi Dave

Is the Buffalo AirStation set up to obtain DNS severs automatically? - a lot of routers have this option.

If "Yes" make sure that your system tcpip configuration uses your network router address as the DNS entry.

If that does not help check what settings your WindowsXP system is using, make a note and then use the same settings in OS/2

Hope the above helps

Pete



Dave Palmer

Andi and Pete:
Thanks for the replies.

Andi - my MTU is and has been the default 1500 - I've not changed it since I installed the DSL modem.  What would I change it to?

Pete:
I'll have to dig up the install CD for the Buffalo and do some checking - again, this has been running since sometime in 2007 - I've had no reason to change it.

That also leads me to question why any of this is happening:  nothing has changed at my end.  I even went back to a full system backup (7/2009) and I have the same problem.

Have any of you tried to access www.oakville-wa.org ?  If so, what do you get?

I'll start digging through the Buffalo - hope it is productive.
Dave

Saijin_Naib

Works fine under XP here. Can't test on my eCS box, my local ISP only allows one external IP address and my router has not arrived yet :\

Andi

Quote from: Dave Palmer on 2009.09.11, 05:20:06
Andi - my MTU is and has been the default 1500 - I've not changed it since I installed the DSL modem.  What would I change it to?
1492 should work. I would try it out with something lower at first f.i. 1460

ifconfig lan0 -mtu 1460

ifconfig lan0 192.168.1.1 -mtu 1460

I'm pretty sure you do not have to reboot when you do that from the command line. And when you change your DNS servers via tcpcfg2 or directly in the file \mptn\etc\resolv2 it's enough to start 'rfcaddr' afterwards and the new one will be used. That's one reason why I love the cli so much. (Remembering the bad days when WinX needs a reboot every time even for the simplest tcp/ip configuration changes....)

Pete

Hi Dave

No problem accessing of the urls mentioned in your posts using Seamonkey V2, eCS2.0RC7

Regards

Pete

Dave Palmer

#11
Addendum since earlier post (below).

dot5hosting has pages of hosted sites to use as references and examples.  I picked one topic and linked to all the domains on that page but one, and that one (not found in a google search) didn't work and exhibited the same symptoms my domains exhibit.  The servers are Debian - does that matter?

Therefore It would appear the dsl modem is eliminated and the issue is either me or the individual domain servers at dot5hosting

Given all the b.s. about this situation what is the logical next step?  Find a fix for tcp/ip?  Switch ISPs?  Install eCS?  Tin can and strings?

From Earlier:
Andi and Pete - thanks for the information and feedback.

Andi:
I tried the ifconfig and had interesting and very confusing results.  I used a combination of 'Clearing Private Data' and ifconfig values and with a mtu value of 1000 I was able to get to each of the 3 domains, but one (1) time only.  After that I couldn't repeat the results even after rebooting the cpu and the dsl modem. 

What do those results mean?  Where and what would I do next?

Pete:
Glad you got through, but that isn't the result I wanted.  Darn.  What would you suggest?

AND:
With a long cable I bypassed the wireless Buffalo AirStation and connected directly to the DSL modem.  No change -

It seems I've eliminated everything down to the DSL modem and the  ISP - so perhaps the next target is the 2-Wire 2701HG-D modem - but I don't have a clue on where to start, as the box has worked since 2007 and I've not touched it since then.

Comments?
Dave


RobertM

Dave:

The servers they are on should not matter (though some early Windows 7 RCs seemed to have some issues with OS/2 during testing - but Debian or anything else being accessed by OS/2 should not be a problem unless a script on the server is trying to return an alternate page for the OS). Try installing the browser in a different directory (fresh install) and run that copy to see what happens. I've had FF hose something big time and cause this on at least (and maybe no more than) one occassion, where even deleting the cache, etc did not resolve it.




Another thing to try is to download and install wGet. Then, from a commandline, do this:

wget http://www.oakville-wa.org/

And see what happens... if that works, it is definitely the browser or the way the browser/OS pair is being handled by some script on their server.

Best,
Robert


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Kirk's 5 Year Mission Continues at:
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Dave Palmer

Hi Robert,

Nothing worked.  Fresh install gives identical results "waiting for ....."

wget produces this:
[C:\os2\wget]wget http://oakville-wa.org
--00:10:18--  http://oakville-wa.org/
           => `index.html'
Resolving oakville-wa.org... 66.96.133.25
Connecting to oakville-wa.org[66.96.133.25]:80... connected.
HTTP request sent, awaiting response...


I also tried sslurp  and it fails as well.

If it a script problem, what script file would I look for?  I have access to the domain using the dot5 domain tools and if there is a common file name I can grab the file.

Thanks,
Dave

Dave Palmer

Good news - but first - why am I experiencing 100% cpu when accessing os2world.com ?
Any time I access the site or click on a link my cpu usage pegs and the system is locked up.
Doesn't happen anywhere or anytime other than here and just today.

Good news - but frankly concerning news - all the sites work today.  I've powered off and rebooted
several times and things are as they were.  So far no communication or feedback from the ISP for
over 2 days - so the solution is unknown - but maybe I can say it has nothing to do with OS/2 ?

Thanks everyone for the help and feedback - I've picked up some new tools and exposure to some
pretty good brains and thought processes.  Much appreciated!

Dave