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Monitor Network Traffic between specific IP addresses

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Last Modified: 2012-05-07
I have a situation where a mainframe application is printing to Okidata serial printers in several remote locations.  It does this by using a Systech device that sits on the network in each location and sends print jobs to the serial port of the various printers.  One specific location is seeing a significant delay in printing (30 seconds to a minute).  I can telnet to the Systech and see when the print job arrives and know the job is delayed getting to the Systech.  I would like to look further upstream to see if I can pinpoint when the job leaves the mainframe, that way I know if the delay is in the mainframe application or the network.  The path from the mainframe to the printer is 1.)3Com 3870 switch 2.)Watchguard Firebox X700 firewall 3.) Watchguard Firebox X Edge 4.)Systech.  The two firewalls are connected via a VPN connection over the internet.

Can anyone suggest a tool I can use to watch and see when traffic from the mainframe bound for the Systech hits the 3Com switch?  I would like to get on the phone with the remote location, have them send a print job and see if I can watch it leave the mainframe.
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Commented:
That worked, 3Comm calls it a Roving Analysis Port.  Thank you.
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