Difference between IPv4 and IPv6

IPv4

IPv6

Addresses are 32 bits (4 bytes) in length.

Addresses are 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 (PTR) resource records in the IN-ADDR.ARPA DNS domain to map IPv4 addresses to host names.

Pointer (PTR) 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

Header does not identify packet flow for QoS handling by routers

Header contains Flow Label field, which Identifies packet flow for QoS handling by router.

Both routers and the sending host fragment packets.

Routers do not support packet fragmentation. Sending host fragments packets

Header includes a checksum.

Header does not include a checksum.

Header includes options.

Optional data is supported as extension headers.

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.

Must support a 576-byte packet size (possibly fragmented).

Must support a 1280-byte packet size (without fragmentation).


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