How to capture packets between 2 IP’s

Do this:

• When you first start Wireshark, click on the button in the far upper-left that says "List the available capture interfaces" when you scroll over it.
• In the new "Capture Interfaces" window that opens, select the interface you want to capture packets (with the check box on the left-hand side) and click"Options".
• In the Capture Options window, on the lower-left corner there should be a "Stop Capture Automatically After..." seciton. Check the "packets" option and put in a value of 50
• In the same Capture Options window, in the text box to the right of "Capture Filter", type the statement (without quotes) "ip host 10.xx.xx.xx and ip host 10.yy.yy.yy".
• Hit the Start button :)

One small thing to note - if the interface you're capturing is doing vlan tagging, replace the capture filter statement to "vlan and ip host 10.xx.xx.xx and ip host 10.yy.yy.yy" without quotes.

Edit:

An even simpler solution is to just use one command line statement:

C:\Program Files\Wireshark\dumpcap.exe -c 50 -i {interface name or number} -w {wherever you want to save the packet capture file}