D-Link DWS-4026 Product Manual - Page 349

Software User Manual 12/10/09 D-Link Unified Access System Field Source IP Mask Source L4 Port Destination IP Address Destination IP Mask Destination L4 Port Table 219: IP ACL Rule Configuration Fields (Cont.) Description Specifies the source IP address wildcard mask. Wild card masks determines which bits are used and which bits are ignored. A wild card mask of 255.255.255.255 indicates that no bit is important. A wildcard of 0.0.0.0 indicates that all of the bits are important. Wildcard masking for ACLs operates differently from a subnet mask. A wildcard mask is in essence the inverse of a subnet mask. With a subnet mask, the mask has ones (1's) in the bit positions that are used for the network address, and has zeros (0's) for the bit positions that are not used. In contrast, a wildcard mask has (0's) in a bit position that must be checked. A '1' in a bit position of the ACL mask indicates the corresponding bit can be ignored. This field is required when you configure a source IP address. After you enter the desired information for the Source IP Address and Source IP Mask, click Submit or Cancel to return to the Rule Configuration page. Requires a packet's TCP/UDP source port to match the port listed here. Click Configure access the configuration page, then complete one of the following fields: • Source L4 Keyword: Select the desired L4 keyword from a list of source ports on which the rule can be based. If you select a keyword other than Other, the screen refreshes and the Source L4 Port Number field disappears. • Source L4 Port Number: If the source L4 keyword is Other, enter a user-defined Port ID by which packets are matched to the rule. Requires a packet's destination port IP address to match the address listed here. Click Configure, and then enter an IP Address in the appropriate field using dotted-decimal notation. The address you enter is compared to a packet's destination IP Address. You also configure the Destination IP Mask on the page. Specify the IP mask in dotted-decimal notation to be used with the Destination IP Address value. Requires a packet's TCP/UDP destination port to match the port listed here. Click Configure access the configuration page, then complete one of the following fields: • Destination L4 Keyword: Select the desired L4 keyword from a list of destination ports on which the rule can be based. If you select a keyword other than Other, the screen refreshes and the Destination L4 Port Number field disappears. • Destination L4 Port Number: If the destination L4 keyword is Other, enter a userdefined Port ID by which packets are matched to the rule. The valid range is 0 to 65535. Document 34CSFP6XXUWS-SWUM100-D7 Configuring Access Control Lists Page 349