Edge-Core ES4626 User Manual page 288

and Path MTU Discovery Mechanism collaborates with data packet source which
enhances the processing efficiency of router.
Address automatic configuration and plug-and-play is supported. Large amounts of
hosts can find network routers easily by address automatic configuration function of IPv6
while obtaining a globally unique IPv6 address automatically as well which makes the
devices using IPv6 Internet plug-and-play. Automatic address configuration function also
makes the readdressing of existing network easier and more convenient, and it is more
convenient for network operators to manage the transformation from one provider to
another.
Support IPSec. IPSec is optional in IPv4, but required in IPv6 Protocol. IPv6
provides security extended header, which provides end-to-end security services such as
access control, confidentiality and data integrity, consequently making the implement of
encryption, validation and Virtual Private Network easier.
Enhance the support for Mobile IP and mobile calculating devices. The Mobile IP
Protocol defined in IETF standard makes mobile devices movable without cutting the
existing connection, which is a network function getting more and more important. Unlike
IPv4, the mobility of IPv6 is from embedded automatic configuration to get transmission
address (Care-Of-Address); therefore it doesn't need Foreign Agent. Furthermore, this
kind of binding process enables Correspondent Node communicate with Mobile Node
directly, thereby avoids the extra system cost caused by triangle routing choice required
in IPv4.
Avoid the use of Network Address Translation. The purpose of the introduction of
NAT mechanism is to share and reuse same address space among different network
segments. This mechanism mitigates the problem of the shortage of IPv4 address
temporally; meanwhile it adds the burden of address translation process for network
device and application. Since the address space of IPv6 has increased greatly, address
translation becomes unnecessary, thus the problems and system cost caused by NAT
deployment are solved naturally.
Support extensively deployed Routing Protocol. IPv6 has kept and extended the
supports for existing Internal Gateway Protocols(IGP for short), and Exterior Gateway
Protocols(EGP for short). For example, IPv6 Routing Protocol such as RIPng, OSPFv3,
IS-ISv6 and MBGP4+, etc.
Multicast addresses increased and the support for multicast has enhanced. By
dealing with IPv4 broadcast functions such as Router Discovery and Router Query, IPv6
multicast has completely replaced IPv4 broadcast in the sense of function. Multicast not
only saves network bandwidth, but enhances network efficiency as well.
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