IPv6 Addressing and Basic Connectivity Configuration Guide, Cisco IOS XE Release 3S
IPv6 Services: AAAA DNS Lookups over an IPv4 Transport
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IPv6 Services: AAAA DNS Lookups over an IPv4 Transport

IPv6 Services: AAAA DNS Lookups over an IPv4 Transport

IPv6 basic connectivity can be enhanced by configuring support for AAAA record types in the DNS name-to-address and address-to-name lookup processes.

Finding Feature Information

Your software release may not support all the features documented in this module. 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 Table at the end of this document.

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 Services: AAAA DNS Lookups over an IPv4 Transport

DNS for IPv6

IPv6 supports DNS record types that are supported in the DNS name-to-address and address-to-name lookup processes. The DNS record types support IPv6 addresses. IPv6 also supports the reverse mapping of IPv6 addresses to DNS names.

The table below lists the IPv6 DNS record types.

Table 1 IPv6 DNS Record Types

Record Type

Description

Format

AAAA

Maps a hostname to an IPv6 address. (Equivalent to an A record in IPv4.)

www.abc.test AAAA 3FFE:YYYY:C18:1::2

PTR

Maps an IPv6 address to a hostname. (Equivalent to a PTR record in IPv4.)

Note   

Cisco software supports resolution of PTR records for the IP6.INT domain.

2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.8.1.c.0.y.y.y.y.e.f.f.3.ip6.int PTR www.abc.test

Additional References

Related Documents

Related Topic

Document Title

IPv6 addressing and connectivity

IPv6 Configuration Guide

IPv4 services configuration

IP Application Services Configuration Guide

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IPv6 commands

Cisco IOS IPv6 Command Reference

Cisco IOS IPv6 features

Cisco IOS IPv6 Feature Mapping

Standards and RFCs

Standard/RFC

Title

RFCs for IPv6

IPv6 RFCs

MIBs

MIB

MIBs Link

None.

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

http:/​/​www.cisco.com/​go/​mibs

Technical Assistance

Description

Link

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.

http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

Feature Information for IPv6 Services: AAAA DNS Lookups over an IPv4 Transport

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.

Table 2 Feature Information for IPv6 Services: AAAA DNS Lookups over an IPv4 Transport

Feature Name

Releases

Feature Information

IPv6 Services: AAAA DNS Lookups over an IPv4 Transport

12.2(2)T

12.2(25)SEA

12.2(25)SG

12.2(33)SRA

12.2(17a)SX1

15.0(2)SG

15.3(1)S

Cisco IOS XE Release 2.1

3.2.0SG

IPv6 basic connectivity can be enhanced by configuring support for AAAA record types in the DNS name-to-address and address-to-name lookup processes.

No commands were introduced or modified.

IPv6 Services: DNS Lookups over an IPv6 Transport

12.2(8)T

12.2(25)SED

12.2(25)SG

12.2(33)SRA

12.2(17a)SX1

15.0(2)SG

15.3(1)S

Cisco IOS XE Release 2.1

3.2.0SG

IPv6 supports this feature.

No commands were introduced or modified.

In Cisco IOS XE Release 3.8S, support was added for the Cisco ISR 4400 Series Routers.

In Cisco IOS XE Release 3.9S, support was added for the Cisco CSR 1000V.