How Does IPv6 Change the Number of Nodes on a Local Area Network?

As people start learning about and deploying IPv6, they start considering how IPv6 changes the way they design and deploy networks and systems. Based on the IPv6 Addressing Architecture (RFC 4291), the standard IPv6 prefix length for LANs is a /64 which provides an astronomically large number of possible host Interface Identifiers (IIDs). In IPv6, […]

Welcome to the New Age: ARIN Exhausts IPv4 Addresses

In the next few days, the American Registry for Internet Numbers (ARIN) will finally run out of IPv4 addresses. ARIN is the Regional Internet Registry (RIR) for the United States, Canada, the Caribbean, and North Atlantic islands, so any organization within those boundaries will no longer be able to guarantee assignment of new IPv4 addresses […]

Securing IPv6 on a Local Access Network

Virtually all organizations now have IPv6-capable systems running on their networks. All modern mobile and computer operating systems run both IPv4 and IPv6 by default. These operating systems try to facilitate access to the IPv6 Internet, if at all possible, and may create IPv6-in-IPv4 tunnels to reach IPv6 content. Some of these processes take place […]

IPv4 Addresses in North America: Going, Going, Gone!

Like the monotonous droning sound of jungle drums so has been the repetitive and continual predictions about the exhaustion of world’s supply of public IPv4 address. We have been hearing about the impending scarcity of IPv4 addresses for so long that we don’t hear the calls to action. The recent announcement by The American Registry […]

Troubleshoot IPv6 and IPv4 with These Free Mobile Apps

Living “Life in a Dual Stack World” requires that we have tools available to help us operate both protocols with aplomb. After all, we will be performing many networking tasks twice; once for IPv4 and once for IPv6. Any technique or tool that we can utilize to speed up our configuration or troubleshooting will help […]

Accounting for Differences between DHCPv6 and DHCP

Much has been said regarding the sometimes-subtle, sometimes-obvious ways that “shiny new” IPv6 is different from the “legacy” IPv4 protocol. One subtle example is how IPv6 uses ICMPv6 for the Neighbor Discovery Protocol (NDP) compared to IPv4’s broadcast messages and ARP method. One overt example is how IPv6 uses behemoth 128-bit addresses where IPv4 uses […]

ARIN Runs Out of IPv4 Addresses

Regional Internet Registries (RIRs) have been running out of IPv4 addresses to give to organizations that operate in their respective geographies.  Early on the run-out was difficult to predict because policies were still in flux.  However, in recent years, with the soft-landing policies each RIR adopted the recent address run-out has been slow but steady.

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