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DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual
205
Counter
Enable or disable the counter settings.
Ports
Specifies that the access rule will take effect on one port or a range of ports.
VLAN Name
Specifies the access rule will take effect on the VLAN Name specified.
VLAN ID
Specifies the access rule will take effect on the VLAN ID specified.
Click Apply to display the following Access Rule List window.
Figure 6 - 26 Access Rule List (Packet Content)
To view the configurations for previously configured rule click on the corresponding Show Details Button which will
display the following Access Rule Details window.
Figure 6 - 27 Access Rule Detail Information (Packet Content)
NOTE: Address Resolution Protocol (ARP) is the standard for finding a
host's hardware address (MAC Address). However, ARP is vulnerable as
it can be easily spoofed and utilized to attack a LAN. For a more detailed
explanation on how ARP works and how to employ D-Link’s advanced
unique Packet Content ACL to prevent ARP spoofing attack, please see
Appendix B, at the end of this manual.
CPU Interface Filtering
Due to a chipset limitation and needed extra switch security, the Switch incorporates CPU Interface filtering. This
added feature increases the running security of the Switch by enabling the user to create a list of access rules for
packets destined for the Switch’s CPU interface. Employed similarly to the Access Profile feature previously
mentioned, CPU interface filtering examines Ethernet, IP and Packet Content Mask packet headers destined for the
CPU and will either forward them or filter them, based on the user’s implementation. As an added feature for the CPU
Filtering, the Switch allows the CPU filtering mechanism to be enabled or disabled globally, permitting the user to
create various lists of rules without immediately enabling them.
Creating an access profile for the CPU is divided into two basic parts. The first is to specify which part or parts of a
frame the Switch will examine, such as the MAC source address or the IP destination address. The second part is
entering the criteria the Switch will use to determine what to do with the frame. The entire process is described below.