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Configuring Access Control Lists
Figure 98. Add Standard IPv4 ACL Page
3.
Specify a sequence number to indicate the position of a rule within the ACL.
4.
Specify the action for the rule:
Permit – The packet or frame is forwarded.
Deny – The packet or frame is dropped.
5.
Specify the match criteria and rule attributes shown in
6.
Click
Apply
Table 74. Standard IPv4 ACL Match Criteria
Field
Description
Match Criteria
Every
When this option is selected, all packets will match the rule and will be either permitted or
denied. This option is exclusive to all other match criteria, so if Every is selected, no other
match criteria can be configured. To configure specific match criteria, this option must be
clear.
Source IP Address /
Wildcard Mask
The source port IP address in the packet and source IP wildcard mask (in the second field)
to compare to the IP address in a packet header. Wild card masks determines which bits in
the IP address 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.