IPv6 enterprise outlook

When I'm not at the beach, the slower office environment of the Northern Hemisphere's summer is a good time to catch up on industry trends. Over the years, I've been most fascinated by the inexorable "have to happen" trends that never materialize - Open Systems Interconnections is my favourite example. As I catch my breath in our summer break, I wonder if IPv6 might end up in the same category, at least as far as the enterprise is concerned.

Vendors come to us to get independent certification of their solutions' capabilities. They are largely driven by what their prospective customers want to see proven. Can the absence of requests for inclusion of IPv6 in test scenarios reflect a lack of interest on the part of the enterprise customer? I think it does.

According to the IPv6 Web site, the world needs to replace the existing IPv4: "IPv6 fixes a number of problems in IPv4, such as the limited number of available IPv4 addresses. It also adds many improvements to IPv4 in areas such as routing and network auto configuration."

But these are problems network executives do not seem to notice. While the address shortage is real, the winning combination of network address translations (NAT) in firewalls combined with VPN technology has made most enterprises immune from that issue.

Using this technology combination, the enterprise can implement a private IPv4 address space without caring whether the address space is in use elsewhere (which it certainly is). VPN tunnels, using IPSec/Point-to-Point Tunneling Protocol or SSL, let remote offices, mobile users and business partners tunnel into the private corporate address space across existing IPv4 networks.

In short, it works just fine. If you polled enterprise network managers and asked them the top 10 items that they want to change or upgrade in their network, I doubt IPv6 would make the list.

I've seen at least one instance of what I call "prove, then remove". I remember seeing one infrastructure vendor that implemented enough IPv6 to meet the checklist requirement. Then, apparently with the customer's approval, the IPv6 code was removed before deployment, which, naturally, was taking place on an IPv4 network.

For so many reasons, IPv6 is not on my near-term forecast for the enterprise.

Kevin Tolly is president of The Tolly Group.

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