Filter
Top Products
DES-7200 Configuration Guide Chapter 2 IPv6 Configuration
2-10
z Hop Limit:
The length is 8 bits. When one router forwards the packet for one time, this field will
reduce 1. If this field is 0, this packet will be discarded. It is similar to the life span field
in the IPv4 packet header.
z Source Address (Source Address):
The length is 128 bits. It indicates the sender address of an IPv6 packet.
z Destination Address (Destination Address):
The length is 128 bits. It indicates the receiver address of an IPv6 packet.
At present, the following extended headers are defined for the IPv6:
z Hop-by-Hop Options:
This extended header must directly follow an IPv6 header. It contains the option data
that must be checked by each node along the path.
z Routing Header (Routing (Type 0)):
This extended header indicates the nodes that a packet will go through before
reaching the destination. It contains the address table of various nodes that the packet
goes through. The initial destination address of the IPv6 header is the first one of a
series of addresses in the route header, other than the final destination address of the
packet. After receiving this packet, the node of this address will process the IPv6
header and the routing header, and send the packet to the second address of the
routing header list. It repeats this step until the packet reaches the final destination.
z Fragment Header (Fragment):
This extended header is used to fragment the packets longer than the MTU of the path
between the source node and destination node.
z Destination Option Header (Destination Options):
This extended header replaces the IPv4 option field. At present, the only defined
destination option is to fill the option with an integer multiple of 64 bits (8 bytes) when
necessary. This extended header can be used to carry the information checked by the
destination node.
z Upper-layer Extended Header (Upper-layer header):
It indicates the the upper layer transmission protocol, such as TCP(6) and UDP(17).
Furthermore, the extended header of the Authentication and the Encapsulating
Security Payload will be described in the IPSec section. At present, the IPv6
implemented by us cannot support the IPSec.