network analysis

Hi

I have a client running a medical practice.  They are using an online EMR system called ezEMRx, and are having some serious issues where periodically the EMR system locks up with what I believe is network anomalies, and they loose their work.  Understandably, the doctors and technicians are very distraught over this.  Sometimes just one doctor is affected and at other times, all are disturbed.  

I've spoken with the EMR tech team.  They mentioned that there is actually very little tolerance for network issues since they need to be very careful because of industry guidelines.  According to them, there must be network related issues, in the office and/or with the ISP (Comcast).

I would like to perform the necessary analysis on the office network,  and have that available while I'll also work with Comcast to be sure they're network availability is undisturbed.

However, I really don't know where to start.  

The client is on a SBS2003 domain with windows XP and Windows 7 clients.  The network is protected by a Sonicwall hybrid router/firewall/access point leading to a switch, distributed through the office.  All clients are on a wired network when these events happen.

Does anyone have guidance as to what to use and how to do the necessary analysis.

Thanks

Mark
Mark LitinOwnerAsked:
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joelsplaceCommented:
If it happens often then you can just start pings and leave them running.  One to the server another to the Sonicwall another to the ISP's gateway etc to see where packets are being lost.  The clients aren't using wireless are they?
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Mark LitinOwnerAuthor Commented:
Hi Joelsplace

Thanks.  Makes sense.  Will try this.

No.  Though there is wireless available, all the doctors are using wired when using that service.

I'll relate what I observe.

Thanks again.

Mark
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hunartCommented:
A few things you need to do to look at to ensure that the network is up and running:

1) You need some sort of network monitoring software such as Solarwinds or Nagios.  This way you could monitor if the network is down.  You can trigger the system to send you an email if the network is down or slow.

2) Contact the ISP and enquire about the network activity or log to see if there were network outages during the day or in the last 24 hours.  Your ISP should be able to provide you the info.

3) Invest money into a more stable network connection or get a redundancy network for this office if the data is that critical.
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Darr247Commented:
I would start with Wireshark.

As far as network forensics and wireshark training, there are likely few better at either than Laura Chappell... see http://chappellu.com/schedule.html

You can probably learn all you need to get started with Wireshark from watching her 4 Wireshark 101 freebies on
https://www.lcuportal2.com/index.php?option=com_content&view=category&layout=blog&id=49&Itemid=75

But those should help decide if the $699/year All-Access-Pass there is worth it to you, too.

K-Lite's Codec Pack enables viewing FLV files in a standalone WMP window, by the way.
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x64 - http://www.codecguide.com/klcp_64bit.htm
then (or if 32-bit only), Standard or Full pack from
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Mark LitinOwnerAuthor Commented:
Thanks lots for your k=efforts and offerings.

I'm testing with a few of these over the next few weeks, and will open it up again after that with updates.

Thanks again.

Mark
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Mark LitinOwnerAuthor Commented:
Hi All

Thanks for your input.  I set pings going from and to the troubled PCs, and found little to none differences.  So further analysis brought me to directly correlate any  difference between the newest PC's present and used for the ERM access and the oldest, and for a startling correlation of failures with the oldest machines.  I have replaced the two with the worst track record with new machines and have observed a 90+% improvement with those machines.  I'm in the process of swapping out all of the old XP dinosaurs used by the doctors now.


Thanks lots for you input.
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