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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

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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IPv4/IPv6 Dual Stack

IPv4/IPv6 Dual Stack

IPv4/IPv6 dual stack is an efficient technology that implements IPv4-to-IPv6 transition. Network devices support both the IPv4 protocol stack and IPv6 protocol stack. The source device selects a protocol stack according to the IP address of the destination device. Network devices between the source and destination devices select a protocol stack to process and forward packets according to the packet protocol type. IPv4/IPv6 dual stack can be implemented on a single device or on a dual-stack network. On a dual-stack network, all devices must support the IPv4/IPv6 dual stack, and interfaces connected to the dual-stack network must have both IPv4 and IPv6 addresses configured. Figure 10-1 shows the single-stack and dual-stack structures.

Figure 10-1 Single-stack and dual-stack structures

Support for IPv4/IPv6 dual stack:

  • Multiple link protocols support IPv4/IPv6 dual stack.

    Multiple link protocols, such as Ethernet and the Point-to-Point Protocol (PPP), support IPv4/IPv6 dual stack. In Figure 10-1, the link layer protocol is the Ethernet protocol. In an Ethernet frame, the protocol ID field value of 0x0800 indicates that the network layer receives IPv4 packets, and the protocol ID field value of 0x86DD indicates that the network layer receives IPv6 packets.

  • Multiple applications support the dual-stack structure.

    Multiple applications, such as Domain Name System (DNS), File Transfer Protocol (FTP), and Telnet, support IPv4/IPv6 dual stack. Upper layer applications such as DNS can use the Transport Control Protocol (TCP) or User Datagram Protocol (UDP) as the transport layer protocol and prefer the IPv6 protocol stack rather than the IPv4 protocol stack as the network layer protocol.

Figure 10-2 shows a typical application of IPv4/IPv6 dual stack.

Figure 10-2 Typical application of IPv4/IPv6 dual stack

In Figure 10-2, the host sends a DNS request to the DNS server for the IP address of domain name www.example.com.

The DNS server searches for the IP address of the domain name and returns the mapped IP address to the host. The mapping IP address may be 10.1.1.1 or fc00::1. The DNS request sent by the host may be a class-A query or class-AAAA query. When the host is an IPv4 host, the host sends a class-A query to the DNS server for the IPv4 address of the domain name. When the host is an IPv6 host, the host sends a class-AAAA query to the DNS server for the IPv6 address of the domain name. The DNS server replies with the mapped IP address of the domain name according to the query type of the received DNS request packet.

The host accesses www.example.com according to the mapped IP address replied from the DNS server. The Switch in Figure 10-2 supports IPv4/IPv6 dual stack. If the host needs to access network server at IPv4 address 10.1.1.1, the host can access the network server through the IPv4 protocol stack of the Switch. If the host needs to access network server at IPv6 address fc00::1, the host can access the network server through the IPv6 protocol stack of the Switch.

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Updated: 2019-05-08

Document ID: EDOC1100004354

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