Re: DNS PROBLEM

From: John Sage (jsage@finchhaven.com)
Date: Tue Aug 29 2000 - 22:14:48 EST


Arshad:

At this point let me say that I'm trying to understand what you're
seeing, but I doubt that I'll get you to an answer.

What you are describing is quite puzzling.

Arshad Mahmood wrote:
>
> On Mon, 28 Aug 2000, Glynn Clements wrote:
> >
> > Arshad Mahmood wrote:
> >
> > > My DNS can not resolve the following domain
> > > passport.com
> >
> > It looks like Microsoft has misconfigured it again[1]. DNS says that
> > hotmail.passport.com is served by ns1.hotmail.com and ns3.hotmail.com,
> > but querying these servers directly reveals that ns1 isn't claiming
> > authority whilst ns3 is.

I'm sorry. I haven't seen this anywhere. Both nslookup, run locally
against a variety of different servers, or
http://dns411.com/cgi-bin/whois.pl essentially return "Domain servers in
listed order: DNS4.CP.MSFT.NET 207.46.138.11; DNS5.CP.MSFT.NET
207.46.138.12"

But not to quibble..

> If we run nslookup then for passport.com
>
> > set q=ns
> > passport.com
> Server: ns1-isb.sdnpk.org
> Address: 203.135.2.55
>
> Non-authoritative answer:
> passport.com nameserver = DNS4.CP.MSFT.NET
> passport.com nameserver = DNS5.CP.MSFT.NET
>
> Authoritative answers can be found from:
> DNS4.CP.MSFT.NET internet address = 207.46.138.11
> DNS5.CP.MSFT.NET internet address = 207.46.138.12

I get exactly the same results, whether using my local nameserver, or
yours, or a nameserver through worldnet.att.net

>
> When I traceroute to DNS4.CP.MSFT.NET then
>
> 12 194.ATM4-0.GW3.SEA1.ALTER.NET (146.188.201.29) 348.981 ms * 347.277 ms
> 13 157.130.177.154 (157.130.177.154) 389.490 ms * *
> 14 207.46.129.14 (207.46.129.14) 397.272 ms * *
> 15 * * *
> 16 * * *
> 17 * * *
> 18 * * *

This is very interesting. When I do a traceroute, I get where we are
wanting to go, and when I look at your results, you're getting one hop
away before it goes dead. The next hop after 207.46.129.14 is
dns5.cp.msft.net at 207.46.138.12 -- this seems *very* odd.

> > server DNS4.CP.MSFT.NET
> Default Server: DNS4.CP.MSFT.NET
> Address: 207.46.138.11
>
> > lc1.law5.hotmail.passport.com
> Server: DNS4.CP.MSFT.NET
> Address: 207.46.138.11
>
> *** DNS4.CP.MSFT.NET can't find lc1.law5.hotmail.passport.com: No response
> from server
>
> The above results show that DNS4.CP.MSFT.NET is down.

"No response from server" parallels your traceroute: I bet you're still
getting one hop away, and then nothing.

I'm not sure your last statement is true; you *can* set server to
DNS4.CP.MSFT.NET and it *does* respond.

When I do this and try to walk back up the domain/server name series, I
can get a response to "passport.com" of name: passport.com address:
207.46.198.16;

when I try to add "hotmail.passport.com" suddenly DNS4 returns "can't
find hotmail.passport.com: Non-existant host/domain.";

when I say lc1.law5.hotmail.passport.com DNS4.CP.MSFT.NET returns
"Non-authoritative answer: name: lc1.law5.hotmail.passport.com address:
209.185.243.7"
 
> And when we type http://www.hotmail.com
>
> The Netscape shows
> Connect: Looking up host: lc2.law5.hotmail.passport.com

So Netscape is finding a reference to "lc2.law5.hotmail.passport.com",
somewhere. This is not remarkable. But now we're referring to lc2.*
Again, I get lc5.*

> After some time netscape gives error Netscape is unable to locate the
> server lc2.law5.hotmail.passport.com Please check the server name and try
> again.

And again, this is the baffling part. Your traceroute is getting one hop
away and dies, and Netscape gives up with a shrug, probably one hop
away, too..

And yet it all works, for me, and probably for millions of other people.

> Any hints or any other facing this problem.

Try the IP numbers in your browser! Again, lc1.* is 209.185.243.7 and
lc2.* is 209.185.243.135

Can you traceroute to either of these IP's? Maybe you just want to get
DNS out of the way ;-)

After that, I have no idea.
 
> Regards,
>
> Arshad Mahmood.

Best wishes!

- John

-- 
John Sage
FinchHaven, Vashon Island, WA, USA
http://www.finchhaven.com/
mailto:jsage@finchhaven.com
And remember: it's spelled l-i-n-u-x but it's pronounced "Linux"
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