SMC Networks TigerAccess SMC7816M - Manual (Page 211)

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Web – Configure the mask to match the required rules in the IP ingress or
egress ACLs. Set the mask to check for any source or destination address, a
specific host address, or an address range. Include other criteria to search
for in the rules, such as a protocol type or one of the service types. Or use
a bitmask to search for specific protocol port(s) or TCP control code(s).
Then click Add.
Figure 8-6 ACL Mask Configuration - IP