[clug] Wierd problem connecting to www.mozilla.organdwww.microsoft.com

[Donovan J. Edye]

G'Day,

>Maybe you could humour me and try dropping the MTU on the Ethernet
<HUMOUR MODE ON>
- There was no MTU key so I added one and set it to 1300
- Rebooted
- I have no idea to know if this worked (How do you tell on a Windoze box
what it thinks the MTU is)
- Made sure GW was .1
- Opened up www.microsoft.com and got...... nowhere (See ethereal dump
below)

</HUMOUR MODE ON>

Back to stabbing the Bill Doll.....


No.     Time        Source                Destination           Protocol
Info
      1 0.000000    hometheatre.home.local origin2.microsoft.com TCP
1092 > http [SYN] Seq=0 Ack=0 Win=65535 Len=0 MSS=1460

Frame 1 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: 00:40:63:ca:84:72, Dst: 00:50:ba:9a:7a:d7
Internet Protocol, Src Addr: hometheatre.home.local (192.168.40.100), Dst
Addr: origin2.microsoft.com (207.46.156.220)
Transmission Control Protocol, Src Port: 1092 (1092), Dst Port: http (80),
Seq: 0, Ack: 0, Len: 0

No.     Time        Source                Destination           Protocol
Info
      2 0.205602    origin2.microsoft.com hometheatre.home.local TCP
http > 1092 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460

Frame 2 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: 00:50:ba:9a:7a:d7, Dst: 00:40:63:ca:84:72
Internet Protocol, Src Addr: origin2.microsoft.com (207.46.156.220), Dst
Addr: hometheatre.home.local (192.168.40.100)
Transmission Control Protocol, Src Port: http (80), Dst Port: 1092 (1092),
Seq: 0, Ack: 1, Len: 0

No.     Time        Source                Destination           Protocol
Info
      3 0.205713    hometheatre.home.local origin2.microsoft.com TCP
1092 > http [ACK] Seq=1 Ack=1 Win=65535 Len=0

Frame 3 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: 00:40:63:ca:84:72, Dst: 00:50:ba:9a:7a:d7
Internet Protocol, Src Addr: hometheatre.home.local (192.168.40.100), Dst
Addr: origin2.microsoft.com (207.46.156.220)
Transmission Control Protocol, Src Port: 1092 (1092), Dst Port: http (80),
Seq: 1, Ack: 1, Len: 0

No.     Time        Source                Destination           Protocol
Info
      4 0.206104    hometheatre.home.local origin2.microsoft.com HTTP
GET / HTTP/1.1

Frame 4 (362 bytes on wire, 362 bytes captured)
Ethernet II, Src: 00:40:63:ca:84:72, Dst: 00:50:ba:9a:7a:d7
Internet Protocol, Src Addr: hometheatre.home.local (192.168.40.100), Dst
Addr: origin2.microsoft.com (207.46.156.220)
Transmission Control Protocol, Src Port: 1092 (1092), Dst Port: http (80),
Seq: 1, Ack: 1, Len: 308
Hypertext Transfer Protocol

No.     Time        Source                Destination           Protocol
Info
      5 3.150457    hometheatre.home.local origin2.microsoft.com HTTP
GET / HTTP/1.1

Frame 5 (362 bytes on wire, 362 bytes captured)
Ethernet II, Src: 00:40:63:ca:84:72, Dst: 00:50:ba:9a:7a:d7
Internet Protocol, Src Addr: hometheatre.home.local (192.168.40.100), Dst
Addr: origin2.microsoft.com (207.46.156.220)
Transmission Control Protocol, Src Port: 1092 (1092), Dst Port: http (80),
Seq: 1, Ack: 1, Len: 308
Hypertext Transfer Protocol

No.     Time        Source                Destination           Protocol
Info
      6 3.400492    origin2.microsoft.com hometheatre.home.local TCP
[TCP Previous segment lost] http > 1092 [ACK] Seq=2921 Ack=309 Win=65227
Len=0

Frame 6 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: 00:50:ba:9a:7a:d7, Dst: 00:40:63:ca:84:72
Internet Protocol, Src Addr: origin2.microsoft.com (207.46.156.220), Dst
Addr: hometheatre.home.local (192.168.40.100)
Transmission Control Protocol, Src Port: http (80), Dst Port: 1092 (1092),
Seq: 2921, Ack: 309, Len: 0

No.     Time        Source                Destination           Protocol
Info
      7 47.126245   candice.home.local    192.168.40.255        NBNS
Name query NB MOE<20>

--D


-----Original Message-----
From: Dale Shaw [mailto:dale.shaw at gmail.com] 
Sent: Thursday, 16 December 2004 13:07
To: donovan at edyeweb.com
Cc: Linux List
Subject: Re: [clug] Wierd problem connecting to
www.mozilla.organdwww.microsoft.com

Getting a bit OT, not that it ever stopped me before..

Maybe you could humour me and try dropping the MTU on the Ethernet
card in the XP box just to rule it in/out. Take it down to 1300 or
something, just to test. It's in the registry, under:
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{guid}\MT
U

If you have multiple interfaces, there will be multiple {guid} keys.
Just flick through and find the one that has some entries that
correspond to your Ethernet card's settings (IP address etc.). Change
the value of 'MTU' to something low (e.g. 1300), reboot (I assume) and
try it all again.

I doubt this really has anything directly to do with XP misbehaving.
More like the D-Link device or even a host-based firewall blocking
ICMP unreachables (specifically type 3/code 4).

You shouldn't see those ICMP redirects now you've changed the default
gateway to be the D-Link, as Andrew suggested.

cheers
Dale


On Thu, 16 Dec 2004 12:46:25 +1100, Donovan J. Edye <donovan at edyeweb.com>
wrote:
> A,
> 
> > Is there a special reason the XP box has the Music box as it's gateway,
> > rather than the Dlink (40.1)?
> No special reason at the moment. I do want to place an internal firewall
on
> .3 and so am setting up all boxes to go to that box. However changing it
to
> .1 produces exactly the same result.
> 
> > Enable HTTP/1.1 and HTTP/1.1 through proxy connections,
> Done. Only the proxy one was not enabled
> 
> > plus disable "Show friendly HTTP error messages" so you get some usefull
> feedback,
> > rather than that pathetic "DNS or server error" page.
> I have done so. Strangely I still get the "The page cannot be displayed
> under IE" Checked and there don't seem to be any other settings that would
> make this happen. Any ideas on that one as well?
> 
> "Hauls out Bill Doll and starts stabbing it with pins"
> 
> --D