Internet Protocol


The migration from IPv4 to IPv6

The internet is undergoing a complex transition to IPv6, providing long-term global and enterprise-level benefits. Various businesses and technical service providers understand the importance of moving to IPv6. Therefore, big companies such as Amazon, Google, and Yahoo, and the providers such as Comcast and Telstra have migrated to dual-stack implementation systems. On the other hand, Microsoft, T-Mobile, AARNet, and CERNET have also migrated to IPv6 due to the benefits it offers.

Alpha InfoLab can help your organization in transitioning from IPv4 to IPv6 (or dual-stack) and take your network infrastructure to the next level. Still confused about how all this works? Speak to our IP experts today.

Why IPv6 is better than IPv4

Benefits of IPv6

More Efficient Routing

IPv6 reduces the size of routing tables and makes routing more efficient and hierarchical. IPv6 allows ISPs to aggregate the prefixes of their customers' networks into a single prefix and announce this one prefix to the IPv6 Internet. In addition, in IPv6 networks, fragmentation is handled by the source device, rather than the router, using a protocol for discovery of the path's maximum transmission unit (MTU).

More Efficient Packet Processing

IPv6's simplified packet header makes packet processing more efficient. Compared with IPv4, IPv6 contains no IP-level checksum, so the checksum does not need to be recalculated at every router hop. Getting rid of the IP-level checksum was possible because most link-layer technologies already contain checksum and error-control capabilities. In addition, most transport layers, which handle end-to-end connectivity, have a checksum that enables error detection.

Directed Data Flows

IPv6 supports multicast rather than broadcast. Multicast allows bandwidth-intensive packet flows (like multimedia streams) to be sent to multiple destinations simultaneously, saving network bandwidth. Disinterested hosts no longer must process broadcast packets. In addition, the IPv6 header has a new field, named Flow Label, that can identify packets belonging to the same flow.

Simplified Network Configuration

Address auto-configuration (address assignment) is built in to IPv6. A router will send the prefix of the local link in its router advertisements. A host can generate its own IP address by appending its link-layer (MAC) address, converted into Extended Universal Identifier (EUI) 64-bit format, to the 64 bits of the local link prefix.

Support For New Services

By eliminating Network Address Translation (NAT), true end-to-end connectivity at the IP layer is restored, enabling new and valuable services. Peer-to-peer networks are easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become more robust.


IPSec, which provides confidentiality, authentication and data integrity, is baked into in IPv6. Because of their potential to carry malware, IPv4 ICMP packets are often blocked by corporate firewalls, but ICMPv6, the implementation of the Internet Control Message Protocol for IPv6, may be permitted because IPSec can be applied to the ICMPv6 packets.