HP 3400CL-24G manual Terminology

Enhancements

Release M.10.02 Enhancements

Terminology

ACE: See Access Control Entry, below.

Access Control Entry (ACE): An ACE is a policy consisting of a packet-handling action and criteria to define the packets on which to apply the action. For RADIUS-based ACLs, the elements composing the ACE include:

•permit or drop (action)

•in < ip-packet-type> from any (source)

•to < ip-address [/ mask ] any > (destination)

•[ port-#] (optional TCP or UDP application port numbers used when the packet type is TCP or UDP)

•[ cnt ] (optional counter that increments when there is a packet match)

ACL: See Access Control List, below.

Access Control List (ACL): A list (or set) consisting of one or more explicitly configured Access Control Entries (ACEs) and terminating with an implicit “deny” default which drops any packets that do not have a match with any explicit ACE in the named ACL.

ACL Mask: Follows a destination IP address listed in an ACE. Defines which bits in a packet’s corresponding IP addressing must exactly match the IP addressing in the ACE, and which bits need not match (wildcards).

DA: The acronym for Destination IP Address. In an IP packet, this is the destination IP address carried in the header, and identifies the destination intended by the packet’s originator.

Deny: An ACE configured with this action causes the switch to drop a packet for which there is a match within an applicable ACL.

Deny Any Any: An abbreviated form of deny in ip from any to any, which denies any inbound IP traffic from any source to any destination.

Extended ACL: This type of Access Control List uses layer-3 IP criteria composed of source and destination IP addresses and (optionally) TCP or UDP port criteria to determine whether there is a match with an IP packet. On the 3400cl switches, the source IP address is always defined as “any”, and extended ACLs apply only to inbound bridged or routed traffic. For a RADIUS-based, extended ACL assigned to a port, only the inbound traffic from the client whose authentication caused the ACL assignment is filtered. Inbound traffic from any other sources is denied.

Implicit Deny: If the switch finds no matches between an inbound packet and the configured criteria in an applicable ACL, then the switch denies (drops) the packet with an implicit “deny IP any/ any” operation. You can preempt the implicit “deny IP any/any” in a given ACL by configuring permit in ip from any to any as the last explicit ACE in the ACL. Doing so permits any inbound IP

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