[ NNSquad ] Re: How do I detect connection disruption by my IAP?

["Fred Reimer" <freimer@ctiusa.com>]

You can download WireShark at www.wireshare.org for a packet
capture and analysis program.  You'd need to know a bit about
TCP/IP in order to make good use of it, but you can search for
TCP packets with the RST bit set.  That would be a "forced"
close.  You CAN get them from some valid destinations, but they
should be rare, and should only happen at the end of a connection
anyway.  A normal closure would be the use of the FIN flags.

Fred Reimer, CISSP, CCNP, CQS-VPN, CQS-ISS
Senior Network Engineer
Coleman Technologies, Inc.
954-298-1697




-----Original Message-----
From: nnsquad-bounces+freimer=ctiusa.com@nnsquad.org
[mailto:nnsquad-bounces+freimer=ctiusa.com@nnsquad.org] On Behalf
Of B.J. Herbison (Mailing lists)
Sent: Thursday, November 08, 2007 10:08 AM
To: nnsquad@nnsquad.org
Subject: [ NNSquad ] How do I detect connection disruption by my
IAP?

I have Comcast as my Internet access provider.  I've been sending
large messages regularly via Gmail (almost daily for a couple of
years).  I sent a message without problem Monday through
Wednesday.

This morning I tried to send a message and it failed five times.
The attachment is large, but a little smaller than yesterday.
The error was:

Oops... a server error occurred and your email was not sent.
(#001)
(Similar error if I try to "save" the message.)

The five send failures and save failure were with Firefox, my
standard browser.  Then I tried from IE and the message was sent.
Then it failed again from Firefox.  (Chance?  Coincidence?
Time-outs somewhere?  I'd love to construct a formal experiment
with multiple computers, different browsers and add-ons, and
stop-watch controlled timing intervals.  Unfortunately, I have a
life.)

How can I tell whether there is a problem with Google today, some
issue "out on the Internet", a Firefox problem, or whether
Comcast is messing with my connections?

Are there any Windows XP tools to monitor my connections (either
inside or out of Firefox) to see if there was a forced close?


                                                Thanks,
                                                B.J.
-- 
B.J. Herbison / bj@herbison.com /
http://www.herbison.com/herbison/bj.html
The Next Asylum / 203 Long Hill Road / Bolton, MA  01740-1421 /
+1 978 634-1061 

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