Wireshark-users: Re: [Wireshark-users] TCP retransmit, HTTP and web page not loading
From: "Frank Bulk" <[email protected]>
Date: Wed, 25 Jun 2008 08:33:21 -0500
Do the fiber and ADSL connections use different IPs?  Sometimes there are
subnet/block-specific issues that cause the problems you describe.

Can you try from the fiber connection on a different block?

Frank 

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Steve Bertrand
Sent: Wednesday, June 25, 2008 8:20 AM
To: [email protected]
Subject: [Wireshark-users] TCP retransmit, HTTP and web page not loading

Hi everyone. This is my first post here, so I hope I'm within context,
and within any list charter with my post (which I could not find ;). By
going through the archives, it appears as though I'm in the right place.

I'll get right to my point. I have a client whom I supply a 100Mbps
Ethernet over fibre connection to, as well as an ADSL connection. One
website in particular, www.tigerdirect.ca works fine over the ADSL
connection.

The same computer connected via fibre can not view the site (well, not
visually...).

I run tcpdump (saved to a Wireshark compatible output file) on my VLAN
switch at my end prior to going to the client end over the fibre. I can
see the communication from workstation to the site and vise-versa, and
it *appears* as though all is well.

The only difference between what I see on ADSL and fibre is the numerous
'TCP Retransmission' errors for one particular GET command on the fibre.
I have two questions (I am not hugely familiar in the frame level
aspects of network communication. I am more in the business of routing
the packets).

There is a screen cap of the final communication between the server and
client if anyone could possibly have a look if they can answer my questions.

http://ibctech.ca/screencap/fibre_communication.jpg

A) Will a TCP session finish successfully even if some frames could not
be ultimately received?

B) From what I have in the screencap without the frames expanded, is it
safe to assume that the file mentioned in the retransmission message did
not get transferred?

Symptoms are the Title of the site appears in the browser, it spins it's
wheels, then stops.

Thanks for any guidance,

Steve
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