C
HAPTER
26
| Access Control Lists
IPv4 ACLs
– 953 –
permit, deny
(Standard IP ACL)
This command adds a rule to a Standard IPv4 ACL. The rule sets a filter
condition for packets emanating from the specified source. Use the no
form to remove a rule.
SYNTAX
{permit | deny} {any | source bitmask | host source}
[time-range time-range-name]
no {permit | deny} {any | source bitmask | host source}
any – Any source IP address.
source – Source IP address.
bitmask – Dotted decimal number representing the address bits to
match.
host – Keyword followed by a specific IP address.
time-range-name - Name of the time range.
(Range: 1-30 characters)
DEFAULT SETTING
None
COMMAND MODE
Standard IPv4 ACL
COMMAND USAGE
◆ New rules are appended to the end of the list.
◆ Address bit masks are similar to a subnet mask, containing four
integers from 0 to 255, each separated by a period. The binary mask
uses 1 bits to indicate “match” and 0 bits to indicate “ignore.” The
bitmask is bitwise ANDed with the specified source IP address, and then
compared with the address for each IP packet entering the port(s) to
which this ACL has been assigned.
EXAMPLE
This example configures one permit rule for the specific address 10.1.1.21
and another rule for the address range 168.92.16.x – 168.92.31.x using a
bitmask.
Console(config-std-acl)#permit host 10.1.1.21
Console(config-std-acl)#permit 168.92.16.0 255.255.240.0
Console(config-std-acl)#
RELATED COMMANDS
access-list ip (952)
Time Range (762)
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