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An optional feature of IPv6, the jumbo payload option in a Hop-By-Hop Options extension header, [8] allows the exchange of packets with payloads of up to one octet less than 4 GB (2 32 − 1 = 4 294 967 295 octets), by making use of a 32-bit length field. Packets with such payloads are called jumbograms.
This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.
Extension headers carry options that are used for special treatment of a packet in the network, e.g., for routing, fragmentation, and for security using the IPsec framework. Without special options, a payload must be less than 64 kB. With a Jumbo Payload option (in a Hop-By-Hop Options extension header), the payload must be less than 4 GB.
A new Home Address option for the Destination Options header; A new Type 2 Routing header; New Internet Control Message Protocol for IPv6 (ICMPv6) messages to discover the set of home agents and to obtain the prefix of the home link; Changes to router discovery messages and options and additional Neighbor Discovery options
Claimed IPv6-ready Installed by default DHCPv6 ND RDNSS Notes AIX: 4.3 Yes Yes Yes No AlliedWare Plus: 5.4.4 Yes Yes Yes No Android: 4.2 (Ice Cream Sandwich) Yes [1] [2] Yes No [3] Yes ChromeOS: 67.0.3396.99 Yes Yes No Yes Cisco IOS: 15.3 Yes Yes Yes Yes [4] Support for RDNSS option as of 15.4(1)T, 15.3(2)S. Cisco Meraki: MR series 28.1 and ...
T-Mobile has made IPv6 its default phone configuration for all new Android 4.3+ devices. [283] using 464XLAT. [284] As of December 2013, phones configured by default for IPv6 / 464XLAT include the Samsung Galaxy Note 3, Galaxy Light, MetroPCS Samsung Mega, and the Google Nexus 5. [285] 2013: Verizon Wireless
Thus, hop count is a rough measure of distance between two hosts. For a routing protocol using 1-origin hop counts [1] (such as RIP), a hop count of n means that n networks separate the source host from the destination host. [1] [2] Other protocols such as DHCP use the term "hop" to refer to the number of times a message has been forwarded. [3]
In IPv6, two forms of source routing have been developed. The first approach was the Type 0 Routing header. [5] This routing header was designed to support the same use cases as the IPv4 header options. As there were several significant attacks against this routing header, its utilisation was deprecated. [6]