Справочное Руководство для Netopia r6100

With a given set of filter rules, there is an implied rule that may or may not be shown to the user. The implied 
rule tells the filter set what to do with a packet that does not match any of the filter rules. An example of implied 
rules is as follows:

The TCP header contains one bit called the ACK bit (or TCP Ack bit). This ACK bit appears only with TCP, not 
UDP. The ACK bit is par t of the TCP mechanism that guarantees the deliver y of data. The ACK bit is set 
whenever one side of a connection has received data from the other side. Only the first TCP packet will not have 
the ACK bit set; once the TCP connection is in place, the remainder of the TCP packets with have the ACK bit 
set.

The ACK bit is helpful for firewall design and reduces the number of potential filter rules. A filter rule could be 
created just allowing incoming TCP packets with the ACK bit set, since these packets had to be originated from 
the local network. 

This is an example of the Netopia IP filter set screen:

Implied

Meaning

Y+Y+Y=N

If all filter rules are YES, the implied rule is NO.

N+N+N=Y

If all filter rules are NO, the implied rule is YES.

Y+N+Y=N

If a mix of YES and NO filters, the implied rule is NO.

                                 Change Filter

         Enabled:                           Yes
         Forward:                           No

         Source IP Address:                 0.0.0.0
         Source IP Address Mask:            0.0.0.0

         Dest. IP Address:                  0.0.0.0
         Dest. IP Address Mask:             0.0.0.0

         Protocol Type:                     TCP

         Source Port Compare...             No Compare
         Source Port ID:                    0
         Dest. Port Compare...              Equal
         Dest. Port ID:                     2000
         Established TCP Conns. Only:       No

Return/Enter accepts * Tab toggles * ESC cancels.
Enter the IP specific information for this filter.