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comparing values with custom columns?

Hi, is it possible, to add a formula into a custom column, to compare two different values? My idea is, to compare the IPID ( of the current packet with the IPID of the previous packet, or alternative the same with the ESP sequence number (esp.sequence). I want to have an easy visible indicator for lost packets in UDP oder ESP streams. If the ID of the current packet is more than "1" higher, than that of the previous captured, a previous packet is missed. I only had to check for values greater 1 in that column. Or is there an alternative solution, to check this in an easy way?

Thanks in advance an best regards! HaKan