Access Control
IPv4-based ACLs
Cisco 500 Series Stackable Managed Switch Administration Guide
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•
Destination IP Address
—Select
Any
if all destination address are
acceptable or
User defined
to enter a destination address or range of
destination addresses.
•
Destination IP Address Value
—Enter the IP address to which the
destination IP address will be matched.
•
Destination IP Wildcard Mask
—Enter the mask to define a range of IP
addresses.
•
Source Port
—Select one of the following:
-
Any
—Match to all source ports.
-
Single
—Enter a single TCP/UDP source port to which packets are
matched. This field is active only if 800/6-TCP or 800/17-UDP is selected
in the Select from List drop-down menu.
-
Range
—Select a range of TCP/UDP source ports to which the packet is
matched. There are eight different port ranges that can be configured
(shared between source and destination ports). TCP and UDP protocols
each have eight port ranges.
•
Destination Port
—Select one of the available values that are the same as
the Source Port field described above.
NOTE
You must specify the IP protocol for the ACE before you can enter the
source and/or destination port.
•
TCP Flags
—Select one or more TCP flags with which to filter packets.
Filtered packets are either forwarded or dropped. Filtering packets by TCP
flags increases packet control, which increases network security.
•
Type of Service
—
The service type of the IP packet.
-
Any
—Any service type
-
DSCP to Match
—Differentiated Serves Code Point (DSCP) to match
-
IP Precedence to M
atch
—IP precedence is a model of TOS (type of
service) that the network uses to help provide the appropriate QoS
commitments. This model uses the 3 most significant bits of the service
type byte in the IP header, as described in RFC 791 and RFC 1349.
•
ICMP
—If the IP protocol of the ACL is ICMP, select the ICMP message type
used for filtering purposes. Either select the message type by name or enter
the message type number:
-
Any
—All message types are accepted.
