Check Point UTM-1 Edge User Manual page 306

Configuring Wireless Networks
In this field... Do this...
Fragmentation Type the smallest IP packet size (in bytes) that requires that the IP packet
Threshold be split into smaller fragments.
If you are experiencing significant radio interference, set the threshold to a
low value (around 1000), to reduce error penalty and increase overall
throughput.
Otherwise, set the threshold to a high value (around 2000), to reduce
overhead.
The default value is 2346.
RTS Threshold Type the smallest IP packet size for which a station must send an RTS
(Request To Send) before sending the IP packet.
If multiple wireless stations are in range of the access point, but not in range
of each other, they might send data to the access point simultaneously,
thereby causing data collisions and failures. RTS ensures that the channel
is clear before the each packet is sent.
If your network is congested, and the users are distant from one another,
set the RTS threshold to a low value (around 500).
Setting a value equal to the fragmentation threshold effectively disables
RTS.
The default value is 2346.
292 Check Point UTM-1 Edge User Guide