So I get airodump to capture packets, but the # packets under "data" does not match the #IV's aircrack claims I collected. For example, I ran a short test and airodump claimed to capture 5300 IV's and Aircrack claimed I only captured 73. I am running the following script:
airodump-ng -c 6 -w zack --bssid **:**:**:**:**:** --ivs wlan0

** astericks are instead of actual MAC address.

If anyone could please shed some light on the discrepancy between programs.

Oh and one more thing, how do you write to a previously created file (in this case zack-01.ivs).