What are the extension headers available in IPv6?
The following IPv6 extension headers are currently defined.
- Routing – Extended routing, like IPv4 loose source route.
- Fragmentation – Fragmentation and reassembly.
- Authentication – Integrity and authentication, security.
- Encapsulation – Confidentiality.
- Hop-by-Hop Option – Special options that require hop-by-hop processing.
How many types of extension headers are there?
IPv6 is using two distinct types of headers: Main/Regular IPv6 Header and IPv6 Extension Headers. The main IPv6 header is equivalent to the basic IPv4 one despite some field differences that are the result of lessons learned from operating IPv4.
Which extension header of IPv6 provides confidentiality and guards against eavesdropping?
Encapsulating Security Payload ESP also provides connectionless integrity, data-origin authentication, protection against replay attacks, limited traffic flow confidentiality, but also provides privacy and confidentiality through encryption of the payload.
Which field is used in an IPv6 header to identify that an extension header follows?
Which field is used in an IPv6 header to identify that an extension header follows? Next Header.
What does a Jumbogram header include?
A “jumbogram” is an IPv6 packet containing a payload larger than 65,535 eight-bit bytes (also known as octets). The regular IPv6 header has a 16-bit Payload Length field and, therefore, supports payloads up to 65,535 octets long.
What is extension header in inipv6?
Understanding IPv6 Packet Header Extensions IPv6 extension headers contains supplementary information used by network devices (such as routers, switches, and endpoint hosts) to decide how to direct or process an IPv6 packet. The length of each extension header is an integer multiple of 8 octets.
What is the role of the next header field in IPv6?
Next Header (8-bits) : Next Header indicates type of extension header(if present) immediately following the IPv6 header. Whereas In some cases it indicates the protocols contained within upper-layer packet, such as TCP, UDP. Hop Limit (8-bits) : Hop Limit field is same as TTL in IPv4 packets.
What is the purpose of extension header in IPv6?
IPv6 extension headers contains supplementary information used by network devices (such as routers, switches, and endpoint hosts) to decide how to direct or process an IPv6 packet. The length of each extension header is an integer multiple of 8 octets. This allows subsequent extension headers to use 8-octet structures.
Why are extension headers introduced in IPv6?
Extension Headers are introduced in IPv6 to overcome the limitation of the Options Field of IPv4. Unlike IPv4, In IPv6, the only information that is really necessary is defined in the Fixed Header, and all those information that are not so important or don’t get frequently used are defined in the Extension Header.
How big is the payload of an IPv6 header?
With 16 bits, up to 65535 bytes can be indicated; but if the Extension Headers contain Hop-by-Hop Extension Header, then the payload may exceed 65535 bytes and this field is set to 0.
How is the next header similar to IPv4?
If compare with the IPv4 protocol, the Next Header is similar to the IPv4 protocol field. This field makes sure that the packet does not go into an infinite loop; every time the packet passes the link (router), this field is decremented by 1 and when it finally reaches where the package is discarded.
Where are IPv6 options located in a packet?
IPv6 options are placed in separate extension headers that are located between the IPv6 header and the transport-layer header in a packet. Most IPv6 extension headers are not examined or processed by any router along a packet’s delivery path until the packet arrives at its final destination.
