Tag Archive for ipv6

Difference between IPv4 and IPv6

Difference between IPv4 and IPv6

IPv4

IPv6

Address size 32 bits (4 bytes) in length. Address size 128 bits (16 bytes) in length
Address (A) resource records in DNS to map host names to IPv4 addresses. Address (AAAA) resource records in DNS to map host names to IPv6 addresses.
Pointer  resource records in the IN-ADDR.ARPA DNS domain to map IPv4 addresses to host names. Pointer  resource records in the IP6.ARPA DNS domain to map IPv6 addresses to host names.
IPSec is optional and should be supported externally IPSec support is not optional
Routers support packet  fragmentation .
Routers do not support packet fragmentation.
Header includes a check-sum. Header does not include a check-sum.
ARP uses broadcast ARP request to resolve IP to MAC/Hardware address. Multicast Neighbor Solicitation messages resolve IP addresses to MAC addresses.
Internet Group Management Protocol (IGMP) manages membership in local subnet groups. Multicast Listener Discovery (MLD) messages manage membership in local subnet groups.
Broadcast addresses are used to send traffic to all nodes on a subnet. IPv6 uses a link-local scope all-nodes multicast address.
Configured either manually or through DHCP. Does not require manual configuration or DHCP.
Supports a 576-byte packet size (possibly fragmented).Deployed in 1981Dotted Decimal Notation:
192.149.252.76

 

Number of Addresses 2^32 = ~4,294,967,296

Supports a 1280-byte packet size (without fragmentation).Deployed in 1999Hexadecimal Notation:3FFE:F200:0234:AB00:
0123:4567:8901:ABCD

 

Number of Addresses:2^128 = ~340,282,366,
920,938,463,463,374,607,431,768,211,456