Re: Will EMF interference show up in Wireshark?

[Paula Dufour <psdufour () gmail com>]

Larry> Will EMF interference show up in Wireshark?

EMF power fluctuates, so if the power is high when critical functions are
active then that could cause a problem with an application.  The issue is
the likelihood that the power will only be high when Helix is making
critical decisions.

Larry>I'm troubleshooting a crashing Helix database server

I am also troubleshooting a crashing Helix server which provides streaming
video to several hundred users.

My network is wired and consists of both fiber and copper connections.  All
the clients have fiber connections and the servers have copper connections.
Clients have 100 Mbps NICs.  Servers have 1 Gbps NICs.  The servers are in a
climate controlled room along with their foundry network switches and
routers.  Clients are in normal office spaces.

As in your case, the OS doesn't crash and all other services continue
without interruption.

Larry>I am sniffing the wire connection to the server, looking for
network-related causes of the crashes.

I have the OpNet Capture Agent installed on the server.

Larry>Currently, the Helix server crashes show on the wire as a pause of
normal Helix I/O traffic:

Larry>Followed by FIN ACK packets sent from the server to the clients, this
is
Larry>Followed by ACK packets from the clients to the server.

I also show normal  TCP connection closures.

Although I'm using Wireshark filters within OpNet Ace.  OpNet Ace is
decoding RTCP as HTTP continuation frames.  Within the TCP streams, I see
occasional out-of-sequence and duplicate ACK's.  So I'm wondering if the
Wireshark filters are not correctly handeling the decode of streaming video
when you have TCP>HTTP>RTCP.

Do anyone of you Wireshark gods know if this is possibly my problem?
Considering that tcpip.sys may be interpreting these packets the same way?
Or is this pause on the wire some server resource issue.  Perhaps even a
configuration issue?

-- 
Paula Dufour
(I did a better job of replying this time, the Subject is relevant to topic
at hand.  She can be trained.)

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