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* It
support billions of hosts and provide better security (authentication and
privacy) than current IP.
* The
IP protocol is simplified when compared to IPV4, which makes the router to
process
the packet at faster rate.
* It
permit the old and new protocols to co-exits for years
* IPV6
maintains good features of IPV4; discards or deemphasizes the badness
* IPV6
is not compatible with IPV4, but it is compatible with other auxiliary Internet
protocols like:-TCP,UDP,ICMP,IGMP,OSPF,BGP,DNS
The
changes made in IPV6 when compared to IPV4 are:-
i)
Longer address fields: - The length of address field is
extended from 32 bits to 128 bits and this huge address space supports up to
3.4 X 1038.
ii)
Simplified Header format: - The header format of IPV6 is simpler
than IPV4
because some fields
in IPV4 are removed from IPV6, such as checksum, IHL, identification, flags,
and fragment offset.
iii)
Flexible support for options: - The options in IPV6 appear
in optional extension headers.
iv)
Security: - IPV6 supports built-in authentication and confidentiality.
v)
Large Packets: - IPV6 supports payloads that are longer than 64K bytes the
packets that are longer than 64K bytes are called jumbo payloads.
vi)
Fragmentation at source only: - Here fragmentation is done
at source by inding minimum MTU along the path.
vii)
No checksum field: - The checksum field is removed to reduce packet processing time
in a router.
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