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Allow to Scan Security Port (113)
Some Linux email servers will try to detect the security TCP/UDP port (113). If you
drop it, the Linux email servers will not allow you to log into. Allow it can solve such
kind of problem.
Discard NetBios Packets
The NetBios protocol is widely used by the MS Windows Network Place, which
should only be use in the home network and should not be used in the Internet
environment. Strongly suggest you to check this item for security consideration.
Accept Fragment Packets
Accept packets that are fragmented.
Send ICMP packets when error
Send ICMP packets when the error happens in connection.
Advance settings
Click this button, the detail hacker attack patterns will appear to let you decide which
one should be enabled. Figure 7-2 shows the hacker attack patterns to protect.
Client Filtering