IPv4 ACLs

IPv4 ACLs permit or deny IPv4 packets according to rules included in the ACLs.

Regarding the range of filtering options, there are two types of IPv4 ACLs:
  • Standard ACLs: Permit or deny traffic according to source address only.
  • Extended ACLs: Permit or deny traffic according to source and destination addresses, as well as other parameters. For example, in an extended ACL, you can also filter by one or more of the following parameters:
    • Port name or number
    • Protocol (for example, TCP or UDP)
    • TCP flags
Regarding ACL naming, there are two types of IPv4 ACLs:
  • Numbered ACLs:
    • You can assign numbers 1 through 99 to standard numbered IPv4 ACLs.
    • You can assign numbers 100 through 199 to extended numbered IPv4 ACLs.
  • Named ACLs, which must begin with an alphabetical character.