2024年9月5日 · Our series on IPv6 basics continues with Router Advertisements (RAs) within the Neighbor Discovery Protocol. We look at how hosts bootstrap onto a network using ICMPv6, discuss the timing of sending out an RA, and then cover the configuration of RAs, including key flags and options.

2023年6月30日 · Router Advertisement (RA): The RA message is sent by routers in response to RS messages or periodically to provide configuration information to hosts on the network. It is an ICMPv6 message sent to the all-nodes multicast address (ff02::1) or …

2015年3月19日 · IPv6 Router Advertisement Message. Router advertisement (RA) messages, which have a value of 134 in the Type field of the ICMP packet header, are periodically sent out each configured interface of an IPv6 router. For stateless autoconfiguration to work properly, the advertised prefix length in RA messages must always be 64 bits.

IPv6 Router Advertisement messages follow a structured format to convey the necessary information to neighboring devices. Here’s an overview of the key components of an RA message: – Type (1 byte): Indicates that the message is a Router Advertisement (Type 134). – Code (1 byte): Always set to 0.

Routers send out Router Advertisement message periodically, or in response to a Router Solicitation message. The ICMPv6 Router Advertisement messages include information about prefixes and some flag bits. Set to 0 (zero) by the originator and ignored by the receiver.

The routing switches covered by this guide support IPv6 RA configuration and transmission based on RFC 4861, “Neighbor Discovery for IP Version 6 (IPv6)” and RFC 4862, “IPv6 Stateless Address Autoconfiguration”.

Since routers are responsible for a few more functions in IPv6 than they are in IPv4, the Router Advertisement message in ICMPv6 has a few more fields than the older version. The format of an ICMPv6 Router Advertisement message is described in Table 109 and shown in Figure 158 .

Following is the IPv6/ICMPv6 packet structure for Router Advertisement. As you see here, Next Header field of IPv6 header is set to be 58 (3A) and the Type field in ICMPv6 is set to be 134. Router Advertisement packet is much more complicated than Router Solicitation and this complication comes from the Option field.

IPv6路由器周期性发送ICMPv6路由器通告RA（RouterAdvertisement）消息，或者在收到路由请求RS（Router Solicitation）消息时回应ICMPv6 RA消息。 ICMPv6 RA消息包括前缀和一些标志位的信息。

Introduction The purpose of this document is to standardize IPv6 Router Advertisement (RA) options (DNS RA options) for DNS Recursive Server Addresses used for DNS name resolution in IPv6 hosts, and also for a DNS Search List (DNSSL) of domain suffixes.