3Com OfficeConnect 3CRWDR101A-75-US User Manual page 71

Figure 55 High Level Firewall Protection Screen
If you select high level of protection, you will need to configure additional
parameters for the firewall.
Fragmentation half-open wait - Configures the number of seconds
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that a packet state structure remains active. When the timeout value
expires, the Router drops the un-assembled packet, freeing that
structure for use by another packet.
TCP SYN wait - Defines how long the software will wait for a TCP
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session to synchronize before dropping the session.
TCP FIN wait - Specifies how long a TCP session will be maintained
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after the firewall detects a FIN packet.
TCP connection idle timeout - The length of time for which a TCP
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session will be managed if there is no activity.
UDP session idle timeout - The length of time for which a UDP session
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will be managed if there is no activity.
H.323 data channel idle timeout - The length of time for which an
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H.323 session will be managed if there is no activity.
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