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10-57

IPv4 Access Control Lists (ACLs)

Configuring Standard ACLs

< any | host < SA > | SA < mask | SA/mask-length >>

Defines the source IPv4 address (SA) a packet must carry for

a match with the ACE.

• any — Allows IPv4 packets from any SA.

• host < SA > — Specifies only packets having < SA > as the

source. Use this criterion when you want to match only the

IPv4 packets from a single SA.

• SA < mask > or SA /mask-length — Specifies packets received

from an SA, where the SA is either a subnet or a group of

IPv4 addresses. The mask format can be in either dotted-

decimal format or CIDR format (number of significant

bits). (Refer to “Using CIDR Notation To Enter the IPv4 ACL

Mask” on page 10-49).

SA Mask Application: The mask is applied to the SA in the

ACE to define which bits in a packet’s SA must exactly match

the SA configured in the ACL and which bits need not match.

Example: 10.10.10.1/24 and 10.10.10.1 0.0.0.255 both define

any address in the range of 10.10.10.(1 - 255).

Note: Specifying a group of contiguous addresses may

require more than one ACE. For more on how masks operate

in ACLs, refer to “How an ACE Uses a Mask To Screen Packets

for Matches” on page 10-35.

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