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IPv6 Duplicate Address Detection (DAD) Proxy feature responds to the DAD queries on behalf of a node that owns the queried address. It is useful in environments where nodes cannot communicate directly on the link.
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 table.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Information About IPv6 DAD Proxy
The IPv6 Duplicate Address Detection (DAD) feature ensures that all the IP addresses assigned on a particular segment are unique. The process operates when IPv6 hosts directly communicate with one another where hosts cannot communicate directly, and a proxy is required.
After a host verifies that its address is unique, it enables the DAD procedure. However, when two hosts cannot communicate with each other, this procedure cannot detect a duplicate address. If the DAD procedure cannot run, both the hosts assigns the same link-local address, which causes both hosts to fail when they try to reach the Dynamic Host Configuration Protocol version 6 (DHCPv6 )server. The IPv6 DAD Proxy feature responds on behalf of the address owner when an address is in use.
The following figure provides an overview of the IPv6 DAD Proxy feature:
How to Configure IPv6 DAD Proxy
1.
enable
2.
configure
terminal
3.
interface
type number
4.
[no] ipv6 nd dad-proxy
5.
end
Configuration Examples for IPv6 DAD Proxy
Device> enable Device# configure terminal Device(config)# interface Ethernet 0/0 Device(config-if)# ipv6 nd dad-proxy Device(config-if)# end
Related Topic |
Document Title |
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IPv6 addressing and connectivity |
IPv6 Configuration Guide |
Cisco IOS commands |
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IPv6 commands |
Cisco IOS IPv6 Command Reference |
Cisco IOS IPv6 features |
MIB |
MIBs Link |
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To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Description |
Link |
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
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IPv6 DAD Proxy |
Cisco IOS XE Release 3.8S Cisco IOS XE Release 3SE Cisco IOS XE Release 3.9S |
IPv6 Duplicate Address Detection (DAD) Proxy feature responds to the DAD queries on behalf of a node that owns the queried address. It is useful in environments where nodes cannot communicate directly on the link. The following commands were introduced or modified: ipv6 nd dad-proxy, mode dad-proxy, mode md-proxy. |