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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring the IPv6 Dynamic Domain Name Resolution

Configuring the IPv6 Dynamic Domain Name Resolution

Context

The DNS client needs to complete dynamic domain name resolution through the DNS server. During dynamic domain name resolution, the DNS server needs to provide the mapping between domain names and IPv6 addresses and receive domain name resolution requests from clients.

Configuring dynamic domain name resolution involves enabling dynamic domain name resolution, configuring an IPv6 address for the DNS server, configuring a source IPv6 address for the local device, and configuring a domain name suffix.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run dns resolve

    Dynamic domain name resolution is enabled.

    By default, dynamic DNS resolution is disabled.

  3. Run dns server ipv6 ipv6-address [ interface-type interface-number ] [ vpn-instance vpn-instance-name ]

    An IPv6 address is configured for the DNS server.

    By default, no DNS server IPv6 address is configured.

    A maximum of six DNS server IP (IPv4 and IPv6) addresses can be configured on the device. During dynamic domain name resolution, the device sends a query packet to the DNS servers according to the order in which they were configured. If the domain name query on the first DNS server times out, the device sends the query request to the second DNS server.

  4. (Optional) Run dns server ipv6 source-ip [ vpn-instance vpn-instance-name ] ipv6-address

    The source IPv6 address of the local device is specified.

    By default, the source IPv6 address is not configured on the device.

    After the IPv6 address of the local device is specified, the device uses the specified IPv6 address to communicate with the DNS server. If no source IPv6 address is configured, the DNS client needs to select a source IPv6 address according to the destination address each time it sends an IPv6 DNS request. If only one route from the DNS server to the device with an IPv6 address is reachable, you need to specify the source IPv6 address in the DNS query message when the device sends a DNS query to the DNS server.

  5. (Optional) Run dns timeout interval-time

    The query response timeout interval for the DNS client is configured.

    By default, the query response timeout interval is 5 seconds for the DNS client.

  6. (Optional) Run dns try times

    The number of retransmissions in the domain name query of the DNS client is configured.

    By default, a domain name query request can be retransmitted twice.

  7. (Optional) Run dns domain domain-name [ vpn-instance vpn-instance-name ]

    A suffix of a domain name is added.

    By default, no domain name suffix is configured on a DNS client.

  8. Run commit

    The configuration is committed.

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Updated: 2019-04-18

Document ID: EDOC1100039535

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