| IPv4 | IPv6 |
| Source and destination addresses are 32 bits (4 bytes) in length. | Source and destination addresses are 128 bits (16 bytes) in length. For more information, see “IPv6 Addressing.” |
| IPsec support is optional. | IPsec support is required. For more information, see “IPv6 Header.” |
| No identification of packet flow for QoS handling by routers is present within the IPv4 header. | Packet flow identification for QoS handling by routers is included in the IPv6 header using the Flow Label field. For more information, see “IPv6 Header.” |
| Fragmentation is done by both routers and the sending host. | Fragmentation is not done by routers, only by the sending host. For more information, see “IPv6 Header.” |
| Header includes a checksum. | Header does not include a checksum. For more information, see “IPv6 Header.” |
| Header includes options. | All optional data is moved to IPv6 extension headers. For more information, see “IPv6 Header.” |
| Address Resolution Protocol (ARP) uses broadcast ARP Request frames to resolve an IPv4 address to a link layer address. | ARP Request frames are replaced with multicast Neighbor Solicitation messages. For more information, see “Neighbor Discovery.” |
| Internet Group Management Protocol (IGMP) is used to manage local subnet group membership. | IGMP is replaced with Multicast Listener Discovery (MLD) messages. For more information, see “Multicast Listener Discovery.” |
| ICMP Router Discovery is used to determine the IPv4 address of the best default gateway and is optional. | ICMP Router Discovery is replaced with ICMPv6 Router Solicitation and Router Advertisement messages and is required. For more information, see “Neighbor Discovery.” |
| Broadcast addresses are used to send traffic to all nodes on a subnet. | There are no IPv6 broadcast addresses. Instead, a link-local scope all-nodes multicast address is used. For more information, see “Multicast IPv6 Addresses.” |
| Must be configured either manually or through DHCP. | Does not require manual configuration or DHCP. For more information, see “Address Autoconfiguration.” |
| Uses host address (A) resource records in the Domain Name System (DNS) to map host names to IPv4 addresses. | Uses host address (AAAA) resource records in the Domain Name System (DNS) to map host names to IPv6 addresses. For more information, see “IPv6 and DNS.” |
| Uses pointer (PTR) resource records in the IN-ADDR.ARPA DNS domain to map IPv4 addresses to host names. | Uses pointer (PTR) resource records in the IP6.ARPA DNS domain to map IPv6 addresses to host names. For more information, see “IPv6 and DNS.” |
| Must support a 576-byte packet size (possibly fragmented). | Must support a 1280-byte packet size (without fragmentation). For more information, see “IPv6 MTU.” |
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https://sharannetwork.blogspot.com/2011/02/ipv6-basics-ii-differences-between-ipv4.html?showComment=1398851302320#c7623078164820062148'> April 30, 2014 at 3:18 PM
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https://sharannetwork.blogspot.com/2011/02/ipv6-basics-ii-differences-between-ipv4.html?showComment=1539173098410#c4051717087622239863'> October 10, 2018 at 5:34 PM
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https://sharannetwork.blogspot.com/2011/02/ipv6-basics-ii-differences-between-ipv4.html?showComment=1630479556764#c7716622691850623373'> September 1, 2021 at 12:29 PM
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