Configuring Device Security
Defining Access Control
Cisco Small Business SFE/SGE Managed Switches Administration Guide 107
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• Destination Port — Defines the TCP/UDP destination port. This field is active
only if 800/6-TCP or 800/17-UDP are selected in the Select from List drop-
down menu. The possible field range is 0 - 65535.
• TCP Flags — Filters packets by TCP flag. Filtered packets are either forwarded
or dropped. Filtering packets by TCP flags increases packet control, which
increases network security. The possible field values are:
• ICMP — Indicates if ICMP packets are permitted on the network. The possible
field values are as follows:.
• ICMP Code — Indicates and ICMP message code for filtering ICMP packets.
ICMP packets that are filtered by ICMP message type can also be filtered by
the ICMP message code.
• IGMP — Filters packets by IGMP message or message types.
• Source
-
IP Address
— Matches the source port IP address from which packets
are addressed to the ACE.
-
Wildcard Mask
— Defines the source IP address wildcard mask.
Wildcard masks specify which bits are used and which bits are ignored.
A wildcard mask of 255.255.255.255 indicates that no bit is important. A
wildcard of 0.0.0.0 indicates that all the bits are important. For example, if
the source IP address 149.36.184.198 and the wildcard mask is
255.36.184.00, the first eight bits of the IP address are ignored, while the
last eight bits are used.
• Destination
-
IP Address
— Matches the destination port IP address to which packets
are addressed to the ACE.
-
Wildcard Mask
— Defines the destination IP address of the wildcard
mask.
• Traffic Class — Indicates the traffic class to which the packet is matched.
Select either Match DSCP or Match IP Precedence.
•
Match DSCP
— Matches the packet to the DSCP tag value.
•
Match IP Precedence
— Matches the packet IP Precedence value to the
ACE. Either the DSCP value or the IP Precedence value is used to match
packets to ACLs. The possible field range is 0-7.
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