Ipv6 Packet Headers; Ipv4 And Ipv6 Header Differences - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide
IPv6 continues to provide the basic packet delivery service for all TCP/IP networks.
As a connectionless protocol, IPv6 does not exchange control information to establish
an end-to-end connection before transmitting data. Instead, just like its IPv4
predecessor, IPv6 continues to rely on protocols in other layers to establish the
connection if connection-oriented services are required and to provide error detection
and error recovery.
In addition to supporting a revised header structure and an expanded addressing
format, the E Series router supports the following IPv6 features:

IPv6 Packet Headers

An IPv6 packet is a block of data that contains a header and a payload. The header
is the information necessary to deliver the packet to a destination address; the payload
is the data that you want to deliver. IPv6 packets can use a standard or an extended
format.

IPv4 and IPv6 Header Differences

The main difference between IPv4 and IPv6 resides in their headers. Figure 13 on
page 127 provides a comparison between the two protocol versions.
126
IPv6 Overview
Expanded addressing capabilities
IPv6 increases the size of the IP address from 32 bits to 128 bits. This increased
size provides a larger address space and a much larger number of addressable
nodes.
Simplified header format
Reducing some common processing costs associated with packet handling and
streamlining the bandwidth cost of the larger IPv6 header, some IPv4-specific
header fields either no longer exist or are now optional in the IPv6 header.
Traffic flow labelling capabilities
The ability to label packets for specific traffic flows exists in the IPv6 packet.
These labels allow for nondefault quality of service (QoS) or the possibility of
"real-time" services.
Authentication capabilities
Authentication provides the ability to use extensions for some authentication
and data integrity applications.
Static routes
ICMPv6
Ping
Traceroute
Routing policy (See JUNOSe IP Services Configuration Guide for details.)
IPv6 B-RAS (See the JUNOSe Broadband Access Configuration Guide for details.)
IPv6 tunnel routing tables