169dabe8_NetPDL_Expressions__NetBee___Description
[Variable] $packetlength [Data type] number (bytes) [Description] 
It keeps the total length of the packet as it is provided by the link-layer. For instance, this value cannot be more than 1518 bytes on a standard Ethernet (without VLANs). Usually, this variable is equal to the framelength; it differs in case the packet has been captured on an Ethernet (with DIX format) and it is smaller than the minimum Ethernet size. For instance, an IP packet of 20 bytes will have packetlength equal to 38 (20 bytes IP plus 18 bytes Ethernet), while framelength will be 64 (the bytes traveling on the network, since the minimum Ethernet frame is 64 bytes).
NetPDL Expressions [NetBee]
Description