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  3. December 2003

Re: Network sniffing tools that work with iSeries

Are you using Switches or Hubs? If it's switches sniffing takes extra steps.

As you may know Hubs broadcast whatever comes in a port out ALL of the other ports on the hub. With this config you can plug in a sniffer into any port on that hub and see any and all trafffic going thru it.

Switches on the other hand build internal tables of what device is attached to what port. When data from device A enters the switch the switch looks up the destination in the packet( device B ), finds device B in its internal table and only sends data out the "1" port where the device B is connected. A sniffer plugged into any other port won't see the data.

To work around the above can be done a couple ways.
#1 On a lot of the Managed Switches you can set them up to allow an port to monitor traffic.
#2 Plug a Hub into the switch and then the sniffer and the device(s) you want to monitor into that hub.

GKern@xxxxxxxxxxxxxxxx wrote:

Are there any tools that are easy to use that allow network sniffing of traffic from an iSeries to M$ servers?

I downloaded a trial version of Softperfects Network Sniffer, which works great for pc based traffic but I cannot seem to get it to monitor traffic between an iSeries and an M$ server. Comments?

Regards,

Gerald Kern
IBM Certified AS/400 RPG IV Developer & RPG IV Programmer
MIS Project Leader, Lotus Notes/Domino Administrator
The Toledo Clinic, Inc.
4235 Secor Road
Toledo, OH 43623-4299
Phone 419-479-5535
gkern@xxxxxxxxxxxxxxxx
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Kirk Goins CCNA
Systems Engineer, Manage Inc.
IBM Certified iSeries Solutions Expert
IBM Certified iSeries e-Business Infrastructure
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