Watchguard V10 User Manual page 162

CHAPTER 6: System Configuration
The following global policy settings are displayed:
TCP Syn Checking
- To enable TCP SYN checking, select the Enable
VPN
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This option enables the inspection of a proper TCP
three-way handshake. It provides an extra layer of
protection against illegal TCP connections.
Syn Checking checkbox.
These options concern the fragmentation of
encrypted packets and the ability to allow IPSec
users to connect to a different appliance.
Vcontroller