Draytek Vigor2820 Series User Manual page 103

Accept large incoming.. Some on-line games (for example: Half Life) will use lots of
Enable Strict Security
Firewall
If you do not have any idea of choosing suitable codepage, please
open Syslog. From Codepage Information of Setup dialog, you
will see the recommended codepage listed on the dialog box.
Window size – It determines the size of TCP protocol (0~65535).
The more the value is, the better the performance will be.
However, if the network is not stable, small value will be proper.
Session timeout–Setting timeout for sessions can make the best
utilization of network resources. However, Queue timeout is
configured for TCP protocol only; session timeout is configured
for the data flow which matched with the firewall rule.
fragmented UDP packets to transfer game data. Instinctively as a
secure firewall, Vigor router will reject these fragmented packets
to prevent attack unless you enable "Accept large incoming
fragmented UDP or ICMP Packets". By checking this box, you
can play these kinds of on-line games. If security concern is in
higher priority, you cannot enable "Accept large incoming
fragmented UDP or ICMP Packets".
For the sake of security, you might want the router executing
strict security checking for data transmission. Check this box to
enable such function.
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Vigor2820 Series User's Guide