An access control list (ACL) is a set of rules (or permit or deny statements) for identifying traffic based on criteria such as source IP address, destination IP address, and port number.

ACLs are primarily used for packet filtering. "Configuring packet filtering with ACLs" provides an example. You can use ACLs in QoS, security, routing, and other feature modules for identifying traffic. The packet drop or forwarding decisions depend on the modules that use ACLs.

Applications on the switch

An ACL is implemented in hardware or software, depending on the module that uses it.

· If the module is implemented in hardware (for example, the packet filter or QoS module), the ACL is applied to hardware to process traffic.

· If the module is implemented in software (for example, the routing module or the user interface access control module such as Telnet or SNMP), the ACL is applied to software to process traffic.

The user interface access control module denies packets that do not match any ACL. Some modules (QoS for example) ignore the permit or deny action in ACL rules and do not base their drop or forwarding decisions on the action set in ACL rules. See the specified module for information about ACL application.

ACL categories

Category	ACL number	IP version	Match criteria
Basic ACLs	2000 to 2999	IPv4	Source IPv4 address.
Basic ACLs	2000 to 2999	IPv6	Source IPv6 address.
Advanced ACLs	3000 to 3999	IPv4	Source IPv4 address, destination IPv4 address, packet priority, protocol number, and other Layer 3 and Layer 4 header fields.
Advanced ACLs	3000 to 3999	IPv6	Source IPv6 address, destination IPv6 address, packet priority, protocol number, and other Layer 3 and Layer 4 header fields.
Ethernet frame header ACLs	4000 to 4999	IPv4 and IPv6	Layer 2 header fields, such as source and destination MAC addresses, 802.1p priority, and link layer protocol type.
User-defined ACLs	5000 to 5999	IPv4 and IPv6	User specified matching patterns in protocol headers.

Numbering and naming ACLs

Each ACL category has a unique range of ACL numbers. When creating an ACL, you must assign it a number. In addition, you can assign the ACL a name for ease of identification. After creating an ACL with a name, you cannot rename it or delete its name.

For an IPv4 basic or advanced ACLs, its ACL number and name must be unique in IPv4. For an IPv6 basic or advanced ACL, its ACL number and name must be unique in IPv6.

Match order

The rules in an ACL are sorted in a specific order. When a packet matches a rule, the device stops the match process and performs the action defined in the rule. If an ACL contains overlapping or conflicting rules, the matching result and action to take depend on the rule order.

The following ACL match orders are available:

· config—Sorts ACL rules in ascending order of rule ID. A rule with a lower ID is matched before a rule with a higher ID. If you use this method, check the rules and their order carefully.

NOTE:

The match order of user-defined ACLs can only be config.

· auto—Sorts ACL rules in depth-first order. Depth-first ordering makes sure any subset of a rule is always matched before the rule. Table 1 lists the sequence of tie breakers that depth-first ordering uses to sort rules for each type of ACL.

Table 1 Sort ACL rules in depth-first order

ACL category	Sequence of tie breakers
IPv4 basic ACL	1. VPN instance. 2. More 0s in the source IPv4 address wildcard (more 0s means a narrower IPv4 address range). 3. Rule configured earlier.
IPv4 advanced ACL	1. VPN instance. 2. Specific protocol number. 3. More 0s in the source IPv4 address wildcard mask. 4. More 0s in the destination IPv4 address wildcard. 5. Narrower TCP/UDP service port number range. 6. Rule configured earlier.
IPv6 basic ACL	1. VPN instance. 2. Longer prefix for the source IPv6 address (a longer prefix means a narrower IPv6 address range). 3. Rule configured earlier.
IPv6 advanced ACL	1. VPN instance. 2. Specific protocol number. 3. Longer prefix for the source IPv6 address. 4. Longer prefix for the destination IPv6 address. 5. Narrower TCP/UDP service port number range. 6. Rule configured earlier.
Ethernet frame header ACL	1. More 1s in the source MAC address mask (more 1s means a smaller MAC address). 2. More 1s in the destination MAC address mask. 3. Rule configured earlier.

A wildcard mask, also called an inverse mask, is a 32-bit binary number represented in dotted decimal notation. In contrast to a network mask, the 0 bits in a wildcard mask represent "do care" bits, and the 1 bits represent "don't care" bits. If the "do care" bits in an IP address are identical to the "do care" bits in an IP address criterion, the IP address matches the criterion. All "don't care" bits are ignored. The 0s and 1s in a wildcard mask can be noncontiguous. For example, 0.255.0.255 is a valid wildcard mask.

Rule numbering

ACL rules can be manually numbered or automatically numbered. This section describes how automatic ACL rule numbering works.

Rule numbering step

If you do not assign an ID to the rule you are creating, the system automatically assigns it a rule ID. The rule numbering step sets the increment by which the system automatically numbers rules. For example, the default ACL rule numbering step is 5. If you do not assign IDs to rules you are creating, they are automatically numbered 0, 5, 10, 15, and so on. The wider the numbering step, the more rules you can insert between two rules.

By introducing a gap between rules rather than contiguously numbering rules, you have the flexibility of inserting rules in an ACL. This feature is important for a config-order ACL, where ACL rules are matched in ascending order of rule ID.

Automatic rule numbering and renumbering

The ID automatically assigned to an ACL rule takes the nearest higher multiple of the numbering step to the current highest rule ID, starting with 0.

For example, if the numbering step is 5 (the default), and there are five ACL rules numbered 0, 5, 9, 10, and 12, the newly defined rule is numbered 15. If the ACL does not contain any rule, the first rule is numbered 0.

Whenever the step changes, the rules are renumbered, starting from 0. For example, if there are five rules numbered 5, 10, 13, 15, and 20, changing the step from 5 to 2 causes the rules to be renumbered 0, 2, 4, 6, and 8.

Fragment filtering with ACLs

Traditional packet filtering matches only first fragments of packets, and allows all subsequent non-first fragments to pass through. Attackers can fabricate non-first fragments to attack networks.

To avoid the risks, the H3C ACL implementation does the following:

· Filters all fragments by default, including non-first fragments.

· Allows for matching criteria modification for efficiency. For example, you can configure the ACL to filter only non-first fragments.

Configuration task list

Tasks at a glance
(Required.) Perform at least one of the following tasks: · Configuring a basic ACL ¡ Configuring an IPv4 basic ACL ¡ Configuring an IPv6 basic ACL · Configuring an advanced ACL ¡ Configuring an IPv4 advanced ACL ¡ Configuring an IPv6 advanced ACL · Configuring an Ethernet frame header ACL · Configuring a user-defined ACL
(Optional.) Copying an ACL
(Optional.) Configuring packet filtering with ACLs

Configuring a basic ACL

This section describes procedures for configuring IPv4 and IPv6 basic ACLs.

Configuring an IPv4 basic ACL

IPv4 basic ACLs match packets based only on source IP addresses.

To configure an IPv4 basic ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create an IPv4 basic ACL and enter its view.	acl number acl-number [ name acl-name ] [ match-order { auto \| config } ]	By default, no ACL exists. IPv4 basic ACLs are numbered in the range of 2000 to 2999. You can use the acl name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the IPv4 basic ACL.	description text	By default, an IPv4 basic ACL has no ACL description.
4. (Optional.) Set the rule numbering step.	step step-value	The default setting is 5.
5. Create or edit a rule.	rule [ rule-id ] { deny \| permit } [ counting \| fragment \| logging \| source { source-address source-wildcard \| any } \| time-range time-range-name \| vpn-instance vpn-instance-name ] *	By default, an IPv4 basic ACL does not contain any rule. The logging keyword takes effect only when the module (for example, packet filtering) that uses the ACL supports logging. If an ACL is for outbound QoS traffic classification or outbound packet filtering, do not specify the vpn-instance keyword.
6. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

Configuring an IPv6 basic ACL

IPv6 basic ACLs match packets based only on source IP addresses.

To configure an IPv6 basic ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create an IPv6 basic ACL view and enter its view.	acl ipv6 number acl-number [ name acl-name ] [ match-order { auto \| config } ]	By default, no ACL exists. IPv6 basic ACLs are numbered in the range of 2000 to 2999. You can use the acl ipv6 name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the IPv6 basic ACL.	description text	By default, an IPv6 basic ACL has no ACL description.
4. (Optional.) Set the rule numbering step.	step step-value	The default setting is 5.
5. Create or edit a rule.	rule [ rule-id ] { deny \| permit } [ counting \| fragment \| logging \| routing [ type routing-type ] \| source { source-address source-prefix \| source-address/source-prefix \| any } \| time-range time-range-name \| vpn-instance vpn-instance-name ] *	By default, an IPv6 basic ACL does not contain any rule. The logging keyword takes effect only when the module (for example, packet filtering) that uses the ACL supports logging. If an ACL is for QoS traffic classification or packet filtering: · Do not specify the fragment keyword. · Do not specify the vpn-instance or routing keyword if the ACL is for outbound QoS traffic classification or outbound packet filtering.
6. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

Configuring an advanced ACL

This section describes procedures for configuring IPv4 and IPv6 advanced ACLs.

Configuring an IPv4 advanced ACL

IPv4 advanced ACLs match packets based on the following criteria:

· Source IP addresses.

· Destination IP addresses.

· Packet priorities.

· Protocol numbers.

· Other protocol header information, such as TCP/UDP source and destination port numbers, TCP flags, ICMP message types, and ICMP message codes.

Compared to IPv4 basic ACLs, IPv4 advanced ACLs allow more flexible and accurate filtering.

To configure an IPv4 advanced ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create an IPv4 advanced ACL and enter its view.	acl number acl-number [ name acl-name ] [ match-order { auto \| config } ]	By default, no ACL exists. IPv4 advanced ACLs are numbered in the range of 3000 to 3999. You can use the acl name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the IPv4 advanced ACL.	description text	By default, an IPv4 advanced ACL has no ACL description.
4. (Optional.) Set the rule numbering step.	step step-value	The default setting is 5.
5. Create or edit a rule.	rule [ rule-id ] { deny \| permit } protocol [ { { ack ack-value \| fin fin-value \| psh psh-value \| rst rst-value \| syn syn-value \| urg urg-value } * \| established } \| counting \| destination { dest-address dest-wildcard \| any } \| destination-port operator port1 [ port2 ] \| { dscp dscp \| { precedence precedence \| tos tos } * } \| fragment \| icmp-type { icmp-type [ icmp-code ] \| icmp-message } \| logging \| source { source-address source-wildcard \| any } \| source-port operator port1 [ port2 ] \| time-range time-range-name \| vpn-instance vpn-instance-name ] *	By default, an IPv4 advanced ACL does not contain any rule. The logging keyword takes effect only when the module (for example, packet filtering) that uses the ACL supports logging. If an ACL is for QoS traffic classification or packet filtering: · Do not specify the vpn-instance keyword if the ACL is for outbound QoS traffic classification or outbound packet filtering. · Do not specify neq for the operator argument.
6. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

Configuring an IPv6 advanced ACL

IPv6 advanced ACLs match packets based on the following criteria:

· Source IPv6 addresses.

· Destination IPv6 addresses.

· Packet priorities.

· Protocol numbers.

· Other protocol header fields such as the TCP/UDP source port number, TCP/UDP destination port number, ICMPv6 message type, and ICMPv6 message code.

Compared to IPv6 basic ACLs, IPv6 advanced ACLs allow more flexible and accurate filtering.

To configure an IPv6 advanced ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create an IPv6 advanced ACL and enter its view.	acl ipv6 number acl-number [ name acl-name ] [ match-order { auto \| config } ]	By default, no ACL exists. IPv6 advanced ACLs are numbered in the range of 3000 to 3999. You can use the acl ipv6 name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the IPv6 advanced ACL.	description text	By default, an IPv6 advanced ACL has no ACL description.
4. (Optional.) Set the rule numbering step.	step step-value	The default setting is 5.
5. Create or edit a rule.	rule [ rule-id ] { deny \| permit } protocol [ { { ack ack-value \| fin fin-value \| psh psh-value \| rst rst-value \| syn syn-value \| urg urg-value } * \| established } \| counting \| destination { dest-address dest-prefix \| dest-address/dest-prefix \| any } \| destination-port operator port1 [ port2 ] \| dscp dscp \| flow-label flow-label-value \| fragment \| icmp6-type { icmp6-type icmp6-code \| icmp6-message } \| logging \| routing [ type routing-type ] \| hop-by-hop [ type hop-type ] \| source { source-address source-prefix \| source-address/source-prefix \| any } \| source-port operator port1 [ port2 ] \| time-range time-range-name \| vpn-instance vpn-instance-name ] *	By default, IPv6 advanced ACL does not contain any rule. The logging keyword takes effect only when the module (for example, packet filtering) that uses the ACL supports logging. If an ACL is for QoS traffic classification or packet filtering: · Do not specify the fragment keyword. · Do not specify neq for the operator argument. · Do not specify the vpn-instance, routing, hop-by-hop, or flow-label keyword if the ACL is for outbound QoS traffic classification or outbound packet filtering. · Do not specify ipv6-ah for the protocol argument, nor set its value to 0, 43, 44, 51, or 60, if the ACL is for outbound QoS traffic classification or outbound packet filtering.
6. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

NOTE:

If an ACL is to match information in the IPv6 packet payload, it can only match packets with one extension header. It cannot match packets with two or more extension headers or with the Encapsulating Security Payload Header.

Configuring an Ethernet frame header ACL

Ethernet frame header ACLs, also called "Layer 2 ACLs," match packets based on Layer 2 protocol header fields, such as:

· Source MAC address.

· Destination MAC address.

· 802.1p priority (VLAN priority).

· Link layer protocol type.

To configure an Ethernet frame header ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create an Ethernet frame header ACL and enter its view.	acl number acl-number [ name acl-name ] [ match-order { auto \| config } ]	By default, no ACL exists. Ethernet frame header ACLs are numbered in the range of 4000 to 4999. You can use the acl name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the Ethernet frame header ACL.	description text	By default, an Ethernet frame header ACL has no ACL description.
4. (Optional.) Set the rule numbering step.	step step-value	The default setting is 5.
5. Create or edit a rule.	rule [ rule-id ] { deny \| permit } [ cos vlan-pri \| counting \| dest-mac dest-address dest-mask \| { lsap lsap-type lsap-type-mask \| type protocol-type protocol-type-mask } \| source-mac source-address source-mask \| time-range time-range-name ] *	By default, an Ethernet frame header ACL does not contain any rule. If an Ethernet frame header ACL is used for packet filtering or QoS traffic classification and the lsap keyword is used, the lsap-type argument value must be AAAA, and the lsap-type-mask argument value must be FFFF. Otherwise, the ACL does not take effect.
6. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

Configuring a user-defined ACL

User-defined ACLs allow you to customize rules based on information in protocol headers. You can define a user-defined ACL to match packets. A specific number of bytes after an offset (relative to the specified header) are compared against a match pattern after being ANDed with a match pattern mask.

To configure a user-defined ACL:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create a user-defined ACL and enter its view.	acl number acl-number [ name acl-name ]	By default, no ACL exists. User-defined ACLs are numbered in the range of 5000 to 5999. You can use the acl name acl-name command to enter the view of a named ACL.
3. (Optional.) Configure a description for the user-defined ACL.	description text	By default, a user-defined ACL has no ACL description.
4. Create or edit a rule.	rule [ rule-id ] { deny \| permit } [ { l2 rule-string rule-mask offset }&<1-8> ] [ counting \| time-range time-range-name ] *	By default, a user-defined ACL does not contain any rule. A user-defined ACL cannot be used for outbound QoS traffic classification or outbound packet filtering.
5. (Optional.) Add or edit a rule comment.	rule rule-id comment text	By default, no rule comments are configured.

NOTE:

If a user-defined ACL is to match packets with VLAN tags, the offset must include the length of the VLAN tags. Each VLAN tag is 4 bytes long.

Copying an ACL

You can create an ACL by copying an existing ACL (source ACL). The new ACL (destination ACL) has the same properties and content as the source ACL, but not the same ACL number and name.

To successfully copy an ACL, make sure:

· The destination ACL number is from the same category as the source ACL number.

· The source ACL already exists, but the destination ACL does not.

To copy an ACL:

Step	Command
1. Enter system view.	system-view
2. Copy an existing ACL to create a new ACL.	acl [ ipv6 ] copy { source-acl-number \| name source-acl-name } to { dest-acl-number \| name dest-acl-name }

Configuring packet filtering with ACLs

This section describes procedures for applying an ACL to filter incoming or outgoing IPv4 or IPv6 packets on the specified interface.

NOTE:

The ACL-based packet filter feature is available on Layer 2 Ethernet interfaces, Layer 2 aggregate interfaces, VLAN interfaces, S-channel interfaces, S-channel aggregate interfaces, VSI interfaces, and VSI aggregate interfaces. The term "interface" in this section collectively refers to these types of interfaces. For more information about S-channel interfaces, S-channel aggregate interfaces, VSI interfaces, and VSI aggregate interfaces, see EVB Configuration Guide.

Applying an ACL to an interface for packet filtering

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter interface view.	interface interface-type interface-number	N/A
3. Apply an ACL to the interface to filter packets.	packet-filter [ ipv6 ] { acl-number \| name acl-name } { inbound \| outbound } [ hardware-count ]	By default, an interface does not filter packets. You can apply only one ACL to the same direction of an interface.

Configuring the applicable scope of packet filtering on a VLAN interface

You can configure the packet filtering on a VLAN interface to filter the following packets:

· Packets forwarded at Layer 3 by the VLAN interface.

· All packets, including packets forwarded at Layer 3 by the VLAN interface and packets forwarded at Layer 2 by the physical ports associated with the VLAN interface.

To configure the applicable scope of packet filtering on a VLAN interface:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Create a VLAN interface and enter its view.	interface vlan-interface vlan-interface-id	If the VLAN interface already exists, you directly enter its view. By default, no VLAN interface exists.
3. Specify the applicable scope of packet filtering on the VLAN interface.	packet-filter filter [ route \| all ]	By default, the packet filtering filters packets forwarded at Layer 3.

Setting the interval for generating and outputting packet filtering logs

After you set the interval, the device periodically generates and outputs the packet filtering logs to the information center, including the number of matching packets and the matched ACL rules. For more information about information center, see Network Management and Monitoring Configuration Guide.

To set the interval for generating and outputting packet filtering logs:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the interval for generating and outputting packet filtering logs.	acl [ ipv6 ] logging interval interval	The default setting is 0 minutes, which mean that no packet filtering logs are generated.

Setting the packet filtering default action

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the packet filtering default action to deny.	packet-filter default deny	By default, the packet filter permits packets that do not match any ACL rule to pass.

Displaying and maintaining ACLs

Execute display commands in any view and reset commands in user view.

Task	Command
Display ACL configuration and match statistics.	display acl [ ipv6 ] { acl-number \| all \| name acl-name }
Display whether an ACL has been successfully applied to an interface for packet filtering.	display packet-filter { interface [ interface-type interface-number ] [ inbound \| outbound ] \| interface vlan-interface vlan-interface-number [ inbound \| outbound ] [ slot slot-number ] }
Display match statistics for packet filtering ACLs.	display packet-filter statistics interface interface-type interface-number { inbound \| outbound } [ [ ipv6 ] { acl-number \| name acl-name } ] [ brief ]
Display the accumulated statistics for packet filtering ACLs.	display packet-filter statistics sum { inbound \| outbound } [ ipv6 ] { acl-number \| name acl-name } [ brief ]
Display detailed ACL packet filtering information.	display packet-filter verbose interface interface-type interface-number { inbound \| outbound } [ [ ipv6 ] { acl-number \| name acl-name } ] [ slot slot-number ]
Display QoS and ACL resource usage.	display qos-acl resource [ slot slot-number ]
Clear ACL statistics.	reset acl [ ipv6 ] counter { acl-number \| all \| name acl-name }
Clear match statistics (including the accumulated statistics) for packet filtering ACLs.	reset packet-filter statistics interface [ interface-type interface-number ] { inbound \| outbound } [ [ ipv6 ] { acl-number \| name acl-name } ]

ACL configuration example

Network requirements

A company interconnects its departments through Device A. Configure an ACL to:

· Permit access from the President's office at any time to the financial database server.

· Permit access from the Financial department to the database server only during working hours (from 8:00 to 18:00) on working days.

· Deny access from any other department to the database server.

Figure 1 Network diagram

Configuration procedure

# Create a periodic time range from 8:00 to 18:00 on working days.

<DeviceA> system-view

[DeviceA] time-range work 08:0 to 18:00 working-day

# Create an IPv4 advanced ACL numbered 3000 and configure three rules in the ACL. One rule permits access from the President's office to the financial database server, one rule permits access from the Financial department to the database server during working hours, and one rule denies access from any other department to the database server.

[DeviceA] acl number 3000

[DeviceA-acl-adv-3000] rule permit ip source 192.168.1.0 0.0.0.255 destination 192.168.0.100 0

[DeviceA-acl-adv-3000] rule permit ip source 192.168.2.0 0.0.0.255 destination 192.168.0.100 0 time-range work

[DeviceA-acl-adv-3000] rule deny ip source any destination 192.168.0.100 0

[DeviceA-acl-adv-3000] quit

# Apply IPv4 advanced ACL 3000 to filter outgoing packets on interface Ten-GigabitEthernet 1/0/1.

[DeviceA] interface ten-gigabitethernet 1/0/1

[DeviceA-Ten-GigabitEthernet1/0/1] packet-filter 3000 outbound

[DeviceA-Ten-GigabitEthernet1/0/1] quit

Verifying the configuration

# Ping the database server from a PC in the Financial department during the working hours. (All PCs in this example use Windows XP).

C:\> ping 192.168.0.100

Pinging 192.168.0.100 with 32 bytes of data:

Reply from 192.168.0.100: bytes=32 time=1ms TTL=255

Reply from 192.168.0.100: bytes=32 time<1ms TTL=255

Ping statistics for 192.168.0.100:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

The output shows that the database server can be pinged.

# Ping the database server from a PC in the Marketing department during the working hours.

C:\> ping 192.168.0.100

Pinging 192.168.0.100 with 32 bytes of data:

Request timed out.

Ping statistics for 192.168.0.100:

Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

The output shows the database server cannot be pinged.

# Display configuration and match statistics for IPv4 advanced ACL 3000 on Device A during the working hours.

[DeviceA] display acl 3000

Advanced ACL 3000, named -none-, 3 rules,

ACL's step is 5

rule 0 permit ip source 192.168.1.0 0.0.0.255 destination 192.168.0.100 0

rule 5 permit ip source 192.168.2.0 0.0.0.255 destination 192.168.0.100 0 time-range work (Active)

rule 10 deny ip destination 192.168.0.100 0

The output shows that rule 5 is active.

08-ACL and QoS Configuration Guide

ACL categories

Numbering and naming ACLs

Rule numbering step

Automatic rule numbering and renumbering

Fragment filtering with ACLs

Configuration task list

Configuring a basic ACL

Configuring an Ethernet frame header ACL

Copying an ACL

Configuring packet filtering with ACLs

Network requirements

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