When the network environment uses jumbo packets, it's important to know the frame size PacketShaper supports.
The maximum frame size that a PS12000 will forward is 2000 bytes.
You can change the MTU size on PacketShaper using the MSS system variables:
setup variable tcpMssInbound 1960
setup variable tcpMssOutbound 1960
Note: MSS is lower than MTU by 40 bytes. (20 bytes for IP header and another 20 bytes for TCP header).