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IPv6 packet
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IPv6 packet
An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers. The payload of an IPv6 packet is typically a datagram or segment of the higher-level transport layer protocol, but may be data for an internet layer (e.g., ICMPv6) or link layer (e.g., OSPF) instead.
IPv6 packets are typically transmitted over the link layer (i.e., over Ethernet or Wi-Fi), which encapsulates each packet in a frame. Packets may also be transported over a higher-layer tunneling protocol, such as IPv4 when using 6to4 or Teredo transition technologies.
In contrast to IPv4, routers do not fragment IPv6 packets larger than the maximum transmission unit (MTU), it is the sole responsibility of the originating node. A minimum MTU of 1,280 octets is mandated by IPv6, but hosts are "strongly recommended" to use Path MTU Discovery to take advantage of MTUs greater than the minimum.
Since July 2017, the Internet Assigned Numbers Authority (IANA) has been responsible for registering all IPv6 parameters that are used in IPv6 packet headers.
The fixed header starts an IPv6 packet and has a size of 40 octets (320 bits). The bytes of the multi-byte fields are in the network byte order.
In order to increase performance, and since current link layer technology and transport layer protocols are assumed to provide sufficient error detection, the header has no checksum to protect it.
Extension headers carry optional internet layer information and are placed between the fixed header and the upper-layer protocol header. Extension headers form a chain, using the Next Header fields. The Next Header field in the fixed header indicates the type of the first extension header; the Next Header field of the last extension header indicates the type of the upper-layer protocol header in the payload of the packet. All extension headers are a multiple of 8 octets in size; some extension headers require internal padding to meet this requirement.
There are several extension headers defined, and new extension headers may be defined in the future. Most extension headers are examined and processed at the packet's destination. Hop-by-Hop Options can be processed and modified by intermediate nodes and, if present, must be the first extension. All extension headers are optional and should appear at most once, except for the Destination Options header extension, which may appear twice.
Hub AI
IPv6 packet AI simulator
(@IPv6 packet_simulator)
IPv6 packet
An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers. The payload of an IPv6 packet is typically a datagram or segment of the higher-level transport layer protocol, but may be data for an internet layer (e.g., ICMPv6) or link layer (e.g., OSPF) instead.
IPv6 packets are typically transmitted over the link layer (i.e., over Ethernet or Wi-Fi), which encapsulates each packet in a frame. Packets may also be transported over a higher-layer tunneling protocol, such as IPv4 when using 6to4 or Teredo transition technologies.
In contrast to IPv4, routers do not fragment IPv6 packets larger than the maximum transmission unit (MTU), it is the sole responsibility of the originating node. A minimum MTU of 1,280 octets is mandated by IPv6, but hosts are "strongly recommended" to use Path MTU Discovery to take advantage of MTUs greater than the minimum.
Since July 2017, the Internet Assigned Numbers Authority (IANA) has been responsible for registering all IPv6 parameters that are used in IPv6 packet headers.
The fixed header starts an IPv6 packet and has a size of 40 octets (320 bits). The bytes of the multi-byte fields are in the network byte order.
In order to increase performance, and since current link layer technology and transport layer protocols are assumed to provide sufficient error detection, the header has no checksum to protect it.
Extension headers carry optional internet layer information and are placed between the fixed header and the upper-layer protocol header. Extension headers form a chain, using the Next Header fields. The Next Header field in the fixed header indicates the type of the first extension header; the Next Header field of the last extension header indicates the type of the upper-layer protocol header in the payload of the packet. All extension headers are a multiple of 8 octets in size; some extension headers require internal padding to meet this requirement.
There are several extension headers defined, and new extension headers may be defined in the future. Most extension headers are examined and processed at the packet's destination. Hop-by-Hop Options can be processed and modified by intermediate nodes and, if present, must be the first extension. All extension headers are optional and should appear at most once, except for the Destination Options header extension, which may appear twice.