Cisco IOS XE IPv6 Configuration Guide, Release 2
Implementing Traffic Filters and Firewalls for IPv6 Security
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Table Of Contents

Implementing Traffic Filters for IPv6 Security

Finding Feature Information

Contents

Prerequisites for Implementing Traffic Filters for IPv6 Security

Restrictions for Implementing Traffic Filters for IPv6 Security

Information About Implementing Traffic Filters for IPv6 Security

Access Control Lists for IPv6 Traffic Filtering

IPv6 Packet Inspection

Tunneling Support

Virtual Fragment Reassembly

Access Class Filtering in IPv6

How to Implement Traffic Filters for IPv6 Security

Configuring IPv6 Traffic Filtering

Restrictions

Creating and Configuring an IPv6 ACL for Traffic Filtering

Applying the IPv6 ACL to an Interface

Controlling Access to a vty

Creating an IPv6 ACL to Provide Access Class Filtering

Applying an IPv6 ACL to the Virtual Terminal Line

Troubleshooting IPv6 Security Configuration and Operation

Configuration Examples for Implementing Traffic Filters for IPv6 Security

Configuring an Access List on the Router: Example

Route Processor Forwarding Manager ACL Configuration: Example

Forwarding Processor Forwarding Manager ACL Configuration: Example

Applying an Access List to an Interface: Example

Route Processor Forwarding Manager ACL Application to an Interface: Example

Forwarding Processor Forwarding Manager ACL Application to an Interface: Example

Viewing Access List Statistics: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Implementing Traffic Filters for IPv6 Security


Implementing Traffic Filters for IPv6 Security

First Published: June 7, 2001
Last Updated: March 2, 2009

This module describes how to configure Cisco IOS XE IPv6 traffic filter and firewall features for your Cisco networking devices. These security features can protect your network from degradation or failure and also from data loss or compromised security resulting from intentional attacks and from unintended but damaging mistakes by well-meaning network users.

Finding Feature Information

For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Implementing Traffic Filters for IPv6 Security" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Implementing Traffic Filters for IPv6 Security

•Restrictions for Implementing Traffic Filters for IPv6 Security

•Information About Implementing Traffic Filters for IPv6 Security

•How to Implement Traffic Filters for IPv6 Security

•Configuration Examples for Implementing Traffic Filters for IPv6 Security

•Additional References

•Feature Information for Implementing Traffic Filters for IPv6 Security

Prerequisites for Implementing Traffic Filters for IPv6 Security

You should be familiar with IPv6 addressing and basic configuration. Refer to the Implementing IPv6 Addressing and Basic Connectivity module for more information.

Restrictions for Implementing Traffic Filters for IPv6 Security

In Cisco IOS XE software, the standard IPv6 ACL functionality is extended to support traffic filtering based on IPv6 option headers and optional, upper-layer protocol type information for finer granularity of control (functionality similar to extended ACLs in IPv4).

Information About Implementing Traffic Filters for IPv6 Security

To implement security features for IPv6, you need to understand the following concept:

•Access Control Lists for IPv6 Traffic Filtering

Access Control Lists for IPv6 Traffic Filtering

The standard ACL functionality in IPv6 is similar to standard ACLs in IPv4. Access lists determine what traffic is blocked and what traffic is forwarded at router interfaces and allow filtering based on source and destination addresses, inbound and outbound to a specific interface. Each access list has an implicit deny statement at the end. IPv6 ACLs are defined and their deny and permit conditions are set using the ipv6 access-list command with the deny and permit keywords in global configuration mode.

IPv6 Packet Inspection

The following header fields are all used for IPv6 inspection—traffic class, flow label, payload length, next header, hop limit, and source or destination address. For further information on and descriptions of the IPv6 header fields, see RFC 2474.

Tunneling Support

IPv6 packets tunneled in IPv4 are not inspected. If a tunnel terminates on a router, and IPv6 traffic exiting the tunnel is nonterminating, then the traffic is inspected.

Virtual Fragment Reassembly

When VFR is enabled, VFR processing begins after ACL input lists are checked against incoming packets. The incoming packets are tagged with the appropriate VFR information.

Access Class Filtering in IPv6

Filtering incoming and outgoing connections to and from the router based on an IPv6 ACL is performed using the ipv6 access-class command in line configuration mode. The ipv6 access-class command is similar to the access-class command, except the IPv6 ACLs are defined by a name. If the IPv6 ACL is applied to inbound traffic, the source address in the ACL is matched against the incoming connection source address and the destination address in the ACL is matched against the local router address on the interface. If the IPv6 ACL is applied to outbound traffic, the source address in the ACL is matched against the local router address on the interface and the destination address in the ACL is matched against the outgoing connection source address. We recommend that identical restrictions are set on all the virtual terminal lines because a user can attempt to connect to any of them.

How to Implement Traffic Filters for IPv6 Security

The tasks in the following sections explain how to configure security features for IPv6:

•Configuring IPv6 Traffic Filtering

•Controlling Access to a vty

•Troubleshooting IPv6 Security Configuration and Operation

Configuring IPv6 Traffic Filtering

The following sections describe how enable IPv6 traffic filtering:

•Creating and Configuring an IPv6 ACL for Traffic Filtering

•Applying the IPv6 ACL to an Interface

Restrictions

IPv6 ACLs are defined by a unique name (IPv6 does not support numbered ACLs). An IPv4 ACL and an IPv6 ACL cannot share the same name.

Creating and Configuring an IPv6 ACL for Traffic Filtering

This section describes how to configure your networking devices to filter traffic or detect potential viruses.

Restrictions

Each IPv6 ACL contains implicit permit rules to enable IPv6 neighbor discovery. These rules can be overridden by the user by placing a deny ipv6 any any statement within an ACL. The IPv6 neighbor discovery process makes use of the IPv6 network layer service; therefore, by default, IPv6 ACLs implicitly allow IPv6 neighbor discovery packets to be sent and received on an interface. In IPv4, the Address Resolution Protocol (ARP), which is equivalent to the IPv6 neighbor discovery process, makes use of a separate data link layer protocol; therefore, by default, IPv4 ACLs implicitly allow ARP packets to be sent and received on an interface.

SUMMARY STEPS

1. enable

2. configure terminal

3. ipv6 access-list access-list-name

4. permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name]
or
deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

ipv6 access-list access-list-name

Example:

Router(config)# ipv6 access-list outbound

Defines an IPv6 ACL, and enters IPv6 access list configuration mode.

•The access-list name argument specifies the name of the IPv6 ACL. IPv6 ACL names cannot contain a space or quotation mark, or begin with a numeral.

Step 4 

permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]][routing] [routing-type routing-number] [sequence value] [time-range name]


or

deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]

Example:

Router(config-ipv6-acl)# permit tcp 2001:0DB8:0300:0201::/32 eq telnet any


or

Example:

Router(config-ipv6-acl)# deny tcp host 2001:0db8:1::1 any log-input

Specifies permit or deny conditions for an IPv6 ACL.


Applying the IPv6 ACL to an Interface

This task describes how to apply the IPv6 ACL to an interface.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. ipv6 traffic-filter access-list-name {in | out}

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface type number

Example:

Router(config)# interface gigabitethernet 0/0/0

Specifies the interface type and number, and enters interface configuration mode.

Step 4 

ipv6 traffic-filter access-list-name {in | out}

Example:

Router(config-if)# ipv6 traffic-filter outbound out

Applies the specified IPv6 access list to the interface specified in the previous step.


Controlling Access to a vty

The following tasks explain how to restrict access to a vty on a router:

•Creating an IPv6 ACL to Provide Access Class Filtering

•Applying an IPv6 ACL to the Virtual Terminal Line

Creating an IPv6 ACL to Provide Access Class Filtering

The following task explains how to control access to a vty on a router by creating an IPv6 ACL to provide access class filtering.

SUMMARY STEPS

1. enable

2. configure terminal

3. ipv6 access-list access-list-name

4. permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name]
or
deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

ipv6 access-list access-list-name

Example:

Router(config)# ipv6 access-list cisco

Defines an IPv6 ACL, and enters IPv6 access list configuration mode.

Step 4 

permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name]


or

deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address} [operator [port-number]] [dest-option-type [doh-number | doh-type]] [dscp value] [flow-label value] [fragments] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]

Example:

Router(config-ipv6-acl)# permit ipv6 host 2001:0DB8:0:4::32 any eq telnet

or

Example:

Router(config-ipv6-acl)# deny ipv6 host 2001:0DB8:0:6::6/32 any

Specifies permit or deny conditions for an IPv6 ACL.


Applying an IPv6 ACL to the Virtual Terminal Line

After you have created the IPv6 ACL for access class filtering, you must apply it to a specified virtual terminal line. The following task describes how to apply the ACL to the virtual terminal line.

SUMMARY STEPS

1. enable

2. configure terminal

3. line [aux | console | tty | vty] line-number [ending-line-number]

4. ipv6 access-class ipv6-access-list-name {in | out}

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

line [aux | console | tty | vty] line-number [ending-line-number]

Example:

Router(config)# line vty 0 4

Identifies a specific line for configuration and enters line configuration mode.

•In this example, the vty keyword is used to specify the virtual terminal lines for remote console access.

Step 4 

ipv6 access-class ipv6-access-list-name {in | out}

Example:

Router(config-line)# ipv6 access-class cisco in

Filters incoming and outgoing connections to and from the router based on an IPv6 ACL.


Troubleshooting IPv6 Security Configuration and Operation

This optional task explains how to display information to troubleshoot the configuration and operation of IPv6 security options. Use the following commands only as needed to verify configuration and operation.

Note Use of the debug commands will provide a great deal of output. Users typically do not need to enable the debug commands.

SUMMARY STEPS

1. enable

2. clear ipv6 access-list [access-list-name]

3. clear ipv6 inspect {session session-number | all}

4. clear ipv6 prefix-list [prefix-list-name] [ipv6-prefix/prefix-length]

5. debug platform software acl config

6. debug platform software acl interface

7. debug platform software acl statistics

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router# enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

clear ipv6 access-list [access-list-name]

Example:

Router# clear ipv6 access-list tin

Resets the IPv6 access list match counters.

Step 3 

clear ipv6 inspect {session session-number | all}

Example:

Router# clear ipv6 inspect all

Removes a specific IPv6 session or all IPv6 inspection sessions.

Step 4 

clear ipv6 prefix-list [prefix-list-name] [ipv6-prefix/prefix-length]

Example:

Router# clear ipv6 prefix-list

Resets the hit count of the IPv6 prefix list entries.

Step 5 

debug platform software acl config

Example:

Router# debug platform software acl config

Enables debugging for ACL configuration changes, such as addition, deletion, or editing of an ACL and ACL entries.

Step 6  

debug platform software acl interface
Example:

Router# debug platform software acl interface

Enables debugging for interface ACL configurations, such as applying or removing an ACL to or from an interface.

Step 7  

debug platform software acl statistics
Example:

Router# debug platform software acl statistics

Enables statistics update messages from the Forwarding Processor Forwarding Manager.


Configuration Examples for Implementing Traffic Filters for IPv6 Security

This section provides the following configuration examples:

•Configuring an Access List on the Router: Example

•Applying an Access List to an Interface: Example

•Viewing Access List Statistics: Example

Configuring an Access List on the Router: Example

This section provides the following configuration examples:

•Route Processor Forwarding Manager ACL Configuration: Example

•Forwarding Processor Forwarding Manager ACL Configuration: Example

Route Processor Forwarding Manager ACL Configuration: Example

The following examples verify Route Processor Forwarding Manager access list configuration: 

Router# show running-config interface port-channel 3.2


Building configuration...


Current configuration : 328 bytes

!

interface Port-channel3.2

 encapsulation dot1Q 2 primary GigabitEthernet0/0/4 secondary GigabitEthernet1/2/4

 ip address 10.1.1.1 255.255.255.0

 ipv6 address 2001:0DB8:1111:1111::1/64

 ipv6 traffic-filter OutFilter_IPv6 out

 ipv6 nd reachable-time 180000

 ipv6 nd ra suppress

 ipv6 ospf 100 area 0

 snmp trap link-status

end


Router# show ipv6 access-list OutFilter_IPv6


IPv6 access list OutFilter_IPv6

    permit icmp any any mld-query sequence 30

    permit icmp any any router-advertisement sequence 40

    deny 103 any any sequence 50

    permit icmp any any packet-too-big sequence 60

    deny icmp any any sequence 70

    deny ipv6 2404:1A8:1100:9::/64 any sequence 74

    deny ipv6 2404:1A8:1100:10::/64 any sequence 75

    permit ipv6 any 2050::/16 log-input sequence 80

    deny ipv6 2404:1A8:1100:13::/64 any sequence 90

    deny ipv6 2404:1A8:1100:14::/64 any sequence 100

    deny ipv6 2408:40:2000::/35 2408:40:2000::/35 dscp default sequence 110

    permit ipv6 any any (3974749339 matches) sequence 120


Router# show platform software access-list R0 statistics


Forwarding Manager Access-list Messaging Statistics


Set Log Threshold: 0, Interval: 0

IPv4 Access-list Entry Add: 1, Delete: 0

IPv4 Access-list Bind: 0, Unbind: 0

IPv4 Access-list Resequence: 0, Delete: 1

IPv6 Access-list Entry Add: 82, Delete: 0

IPv6 Access-list Bind: 3003, Unbind: 0

IPv6 Access-list Resequence: 0, Delete: 0

Access-list Sync Start: 0, End: 0


CPP Match Add: 0, Replace: 0, ACK Success: 0, ACK Error: 0

CPP Match Delete: 0, ACK Success: 0, ACK Error: 0

CPP Action Edit: 0, ACK Success: 0, ACK Error: 0

CPP Action Replace: 0, ACK Success: 0, ACK Error: 0

CPP Bind: 0, ACK Success: 0, ACK Error: 0

CPP Unbind: 0, ACK Success: 0, ACK Error: 0


Router# show platform software access-list R1 name OutFilter_IPv6 ace 100


Access-list: OutFilter_IPv6

Access-list Entry Sequence: 100

  Type: Permanent, Operation: Add

  Action: Deny

  Destination Address: ::, Length: 00

  Source Address: 2404:1a8:1100:14::, Length: 0x24

Forwarding Processor Forwarding Manager ACL Configuration: Example

The following examples verify Forwarding Processor Forwarding Manager access list configuration: 

Router# show platform software access-list F0 statistics 


Forwarding Manager Access-list Messaging Statistics


Set Log Threshold: 0, Interval: 0

IPv4 Access-list Entry Add: 0, Delete: 0

IPv4 Access-list Bind: 0, Unbind: 0

IPv4 Access-list Resequence: 0, Delete: 1

IPv6 Access-list Entry Add: 82, Delete: 0

IPv6 Access-list Bind: 3003, Unbind: 0

IPv6 Access-list Resequence: 0, Delete: 0

Access-list Sync Start: 0, End: 0


CPP Match Add: 86, Replace: 0, ACK Success: 86, ACK Error: 0

CPP Match Delete: 4, ACK Success: 4, ACK Error: 0

CPP Action Edit: 83, ACK Success: 83, ACK Error: 0

CPP Action Replace: 0, ACK Success: 0, ACK Error: 0

CPP Bind: 3003, ACK Success: 3003, ACK Error: 0

CPP Unbind: 0, ACK Success: 0, ACK Error: 0

The following example shows the download statistics for each access control list entry: 

Router# show platform software access-list F0 name OutFilter_IPv6 ace 100


  Access-list: OutFilter_IPv6

  Access-list Entry Sequence: 100

  Match Class Index: 11

  Epoch: 0

  State: Downloaded

  Requested Operation: No-op

  Issued Operation: No-op

  Type: Permanent

Action: Deny


Router# access-list F0 name OutFilter_IPv6 ace 100 max-records 20


Access-list: OutFilter_IPv6

Access-list Index: 2, Protocol: IPv6, Type: IPv6

  Security References: 2001, Classifier References: 0, Shared target: 2001

  Pending Download Access-list Entry: 0

  Pending Acknowledgements Matches: 0, Actions: 0

  Downloaded Access-list Entry: 12

  Total Access-list Entry after pending updates are processed: 12

  AOM object identifier: 141

  State: Normal


  Number of Access-list Entry Shown: 3

  ACE Number  Class Index  State                                       

  -------------------------------------------------------------------

  100         11           Downloaded                                  

  110         12           Downloaded                                  

  120         13           Downloaded

The following command summarizes the number of entries and references in the access list: 

Router# show platform software access-list F0 summary


Access-list                          Index        Num Ref      Num ACEs     

--------------------------------------------------------------------------

icmp2                                1            1            2            

OutFilter_IPv6                       2            2001         12           

p11                                  3            1000         3

Applying an Access List to an Interface: Example

This section provides the following configuration examples:

•Route Processor Forwarding Manager ACL Application to an Interface: Example

•Forwarding Processor Forwarding Manager ACL Application to an Interface: Example

Route Processor Forwarding Manager ACL Application to an Interface: Example

The following examples configure and verify the Route Processor Forwarding Manager access list application to GigabitEthernet 1/0/1: 

Router(config)# interface GigabitEthernet 1/0/1

Router(config-if)# ip access-group test in


Router# show platform software access-list R0 statistics 


Forwarding Manager Access-list Messaging Statistics

Set Log Threshold: 0, Interval: 0

IPv4 Access-list Entry Add: 1, Delete: 0

IPv4 Access-list Bind: 0, Unbind: 0

IPv4 Access-list Resequence: 0, Delete: 1

IPv6 Access-list Entry Add: 82, Delete: 0

IPv6 Access-list Bind: 3003, Unbind: 0

IPv6 Access-list Resequence: 0, Delete: 0

Access-list Sync Start: 0, End: 0


CPP Match Add: 0, Replace: 0, ACK Success: 0, ACK Error: 0

CPP Match Delete: 0, ACK Success: 0, ACK Error: 0

CPP Action Edit: 0, ACK Success: 0, ACK Error: 0

CPP Action Replace: 0, ACK Success: 0, ACK Error: 0

CPP Bind: 0, ACK Success: 0, ACK Error: 0

CPP Unbind: 0, ACK Success: 0, ACK Error: 0


Router# show platform software access-list R0 bind interface Port-channel1.2


Interface: Port-channel1.2, Index: 35, Protocol: IPv6, Direction: Output

  Access-list: OutFilter_IPv6

  Operation: Add

Forwarding Processor Forwarding Manager ACL Application to an Interface: Example

The following examples configure and verify the Forwarding Processor Forwarding Manager access list application to Gigabit Ethernet 1/0/1: 

Router(config)# interface GigabitEthernet 1/0/1

Router(config-if)# ip access-group test in


Router# show platform software access-list F0 statistics 


Forwarding Manager Access-list Messaging Statistics


Set Log Threshold: 0, Interval: 0

IPv4 Access-list Entry Add: 0, Delete: 0

IPv4 Access-list Bind: 0, Unbind: 0

IPv4 Access-list Resequence: 0, Delete: 1

IPv6 Access-list Entry Add: 82, Delete: 0

IPv6 Access-list Bind: 3003, Unbind: 0

IPv6 Access-list Resequence: 0, Delete: 0

Access-list Sync Start: 0, End: 0

CPP Match Add: 86, Replace: 0, ACK Success: 86, ACK Error: 0

CPP Match Delete: 4, ACK Success: 4, ACK Error: 0

CPP Action Edit: 83, ACK Success: 83, ACK Error: 0

CPP Action Replace: 0, ACK Success: 0, ACK Error: 0

CPP Bind: 3003, ACK Success: 3003, ACK Error: 0

CPP Unbind: 0, ACK Success: 0, ACK Error: 0

The following example provides a summary of the access list with number of entries and number of references: 

Router# show platform software access-list F0 summary 


Access-list                          Index        Num Ref      Num ACEs

--------------------------------------------------------------------------

icmp2                                  1             1             2

OutFilter_IPv6                         2             2001         12

p11                                    3             1000          3

m1                                     4             1             2

p1                                     5             0             3

Viewing Access List Statistics: Example

The following example output for ACL statistics provides information about the counter aggregation and poll timer: 

Router# show ipv6 access-list OutFilter_IPv6


IPv6 access list OutFilter_IPv6

    permit icmp any any mld-query sequence 30

    permit icmp any any router-advertisement sequence 40

    deny 103 any any sequence 50

    permit icmp any any packet-too-big sequence 60

    deny icmp any any sequence 70

    deny ipv6 2001:0DB8:1100:9::/64 any sequence 74

    deny ipv6 2001:0DB8:1100:10::/64 any sequence 75

    permit ipv6 any 2050::/16 log-input sequence 80

    deny ipv6 2001:0DB8:1100:13::/64 any sequence 90

    deny ipv6 2001:0DB8:1100:14::/64 any sequence 100

    deny ipv6 2001:0DB8:2000::/35 2408:40:2000::/35 dscp default sequence 110

    permit ipv6 any any (175392444 matches) sequence 120

Additional References

The following sections provide references related to the Implementing Traffic Filters for IPv6 Security feature.

Related Documents

Related Topic
Document Title

Basic IPv6 configuration

"Implementing IPv6 Addressing and Basic Connectivity," Cisco IOS XE IPv6 Configuration Guide

IPv6 supported feature list

"Start Here: Cisco IOS XE Software Release Specifics for IPv6 Features," Cisco IOS XE IPv6 Configuration Guide

IPv6 commands: complete command syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS IPv6 Command Reference

Cisco IOS master command list, all  releases

Cisco IOS Master Command List, All Releases


Standards

Standards
Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—


MIBs

MIBs
MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFCs
Title

RFC 2401

Security Architecture for the Internet Protocol

RFC 2402

IP Authentication Header

RFC 2428

FTP Extensions for IPv6 and NATs

RFC 2460

Internet Protocol, Version 6 (IPv6) Specification

RFC 2474

Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers

RFC 3576

Change of Authorization


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

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Feature Information for Implementing Traffic Filters for IPv6 Security

Table 1 lists the features in this module and provides links to specific configuration information.

For information about a feature in this technology that is not documented here, see the Start Here: Cisco IOS XE Software Release Specifics for IPv6 Features.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.

Table 1 Feature Information for Implementing Traffic Filters for IPv6 Security 

Feature Name
Releases
Feature Information

IPv6 services: standard access control lists

Cisco IOS XE Release 2.1

Access lists determine what traffic is blocked and what traffic is forwarded at router interfaces and allow filtering based on source and destination addresses, inbound and outbound to a specific interface.

The following sections provide information about this feature:

•Restrictions for Implementing Traffic Filters for IPv6 Security

•Access Control Lists for IPv6 Traffic Filtering

•IPv6 Packet Inspection

•How to Implement Traffic Filters for IPv6 Security

•Configuration Examples for Implementing Traffic Filters for IPv6 Security

The following commands were modified by this feature: clear ipv6 access-list, clear ipv6 inspect, clear ipv6 prefix-list, deny, ipv6 access-class, ipv6 access-list, ipv6 traffic-filter, line, permit, show ipv6 access-list

IPv6 services: extended access control lists

Cisco IOS XE Release 2.1

Standard IPv6 ACL functionality was extended to support traffic filtering based on IPv6 option headers and optional, upper-layer protocol type information for finer granularity of control.

The following sections provide information about this feature:

•Restrictions for Implementing Traffic Filters for IPv6 Security

•Access Control Lists for IPv6 Traffic Filtering

•How to Implement Traffic Filters for IPv6 Security

•Configuration Examples for Implementing Traffic Filters for IPv6 Security

The following commands were modified by this feature: clear ipv6 access-list, clear ipv6 inspect, clear ipv6 prefix-list, deny, ipv6 access-class, ipv6 access-list, ipv6 traffic-filter, line, permit, show ipv6 access-list


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