169dabe8_NetPDL_Expressions__NetBee___Description
[Variable] $nextproto [Data type] protocol [Description] 
It keeps the protocol that follows the current one. For instance, in case of ethernet-IP-UDP, the value of this variable will be #IP after processing ethernet, #UDP after processing IP, and so on. Please note that this variable is updated only when the protocol processing ended, since there is no way to know the next protocol till the current one has been completely understood. Viceversa, variable $prevproto is updated before beginning the processing of the selected protocol.
NetPDL Expressions [NetBee]
Description