As is our tradition by now a team of volunteers helped out with the network setup and operation of Free and Open-source Software Developers’ European Meeting (FOSDEM). The network was very similar to the one used over the last two years and we wanted to report on the evolution of the traffic we measured.
This year, we were able to go much ‘deeper’ into the traffic, so we have a lot more to report. Too much in fact for one article, so this is the first in a series.
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Tags: disabling IPv4, DNS64, FOSDEM, IPv6, IPv6-only SSID, IPv6-only WiFi, NAT64
As is our tradition by now a team of volunteers helped out with the network setup and operation of Free and Open-source Software Developers’ European Meeting (FOSDEM). The network was very similar to the one used last year and we wanted to report on the evolution of the traffic we measured.
First the bad news: due to the increased use of IPv6 we have less accurate data. This is because while IPv4 uses a unique MAC address which we can use to count the number of clients, IPv6 uses ephemeral addresses, and one physical device can use multiple global IPv6 addresses. In fact we noticed one client using more than 100 global IPv6 addresses over a period of 240 seconds. Why this client is doing this is a mystery.
The unique link local IPv6 addresses were only kept in the neighbour cache of the router for a limited time, so we have no good numbers for the amount of clients. The good news is we can still use traffic counters to compare with the previous year.
Internet traffic evolution
Compared to 2014 we saw a 20% increase in traffic to more than 2 terabytes of traffic exchanged with the internet.
Fosdem 2015 wireless traffic distribution
More interestingly the IPv4 traffic on the wireless network decreased by almost 20% with the net result that now the IPv6 traffic is 60% of the traffic on the wireless network, while IPv4 traffic is only 40%. So IPv6 traffic is 1.5 times the IPv4 traffic. This is a good indicator that most clients now can use NAT64 and can live on a IPv6 only network.
Internet IPv4 versus IPv6 for Fosdem 2014-2015
On the internet side the IPv4 traffic increased by 5% while the IPv6 traffic almost doubled. As we use NAT64 to give access to IPv4 only hosts using IPv6 only on the internal network this measurement is a clear indication that more content is now available via IPv6.
For next year we plan to setup some more tracking systems in advance so we can investigate the number of clients on the wireless network and why some clients are using hundreds of global IPv6 addresses.
Tags: disabling IPv4, FOSDEM, IPv6, IPv6-only SSID, NAT64
For a few of us in the Cisco Brussels office the last weekend of January always marks a special occasion.
The weekend is dedicated to the Free and Open-source Software Developers’ European Meeting (FOSDEM) conference in Brussels, with around 5,000 visitors attending. The event happens at the ULB (Université libre de Bruxelles) campus, but traditionally uses its own network infrastructure, sponsored by Cisco. And we, who are Cisco employees, volunteered our time to help the community as well as meet some new friends and get extra hands-on experience with a sizable network.
What was different this year was that just before the official start of the conference I finally figured out how NAT64 works, gave a 5 minute warning on twitter (image below), and then disabled IPv4 on the main network (simply stated I removed the IPv4 address of the router on the client interface so that only the IPv6 address remained).
That meant that visitors would only get an IPv6 address Read More »
Tags: cisco live, disabling IPv4, FOSDEM, IPv6, IPv6-only SSID, NAT64
Unless you have been asleep behind the wheel of your network, you know the IPv6 Internet will go live on June 6th, 2012 and Cisco is taking a leading role. If you didn’t make it to Paris a few weeks back for v6 World Congress there are two upcoming events in Denver, Colorado where you can learn about deploying IPv6 in your network.
1. Breakfast Session: Making the IPv6 Transition will be held the morning of Tuesday March 20th from 7:30-930 am before the Lightreading Cable Next-Gen Broadband Strategies: Wideband, Wireless, PON & Beyond event. Fred Baker, Cisco Fellow and current Co-chair of the IETF IPv6 Operations Working Group, will be presenting and taking questions at the breakfast. He’ll cover how cable operators can deploy IPv6 on their network and will be available to meet with attendees after the breakfast. Register here to take advantage of this special opportunity. Read More »
Tags: 2012 North American IPv6 Summit, 6rd, Andrew Yourtchenko, announcements, cgv6, Denver Colorado, Dual Stack, Fred Baker, IETF IPv6 Operations Working Group, LISP, NAT64, Shannon McFarland, SLB64
During our customer reception for the V6 World Congress 2012 we had an opportunity to discuss the impact and opportunity of IPv6 on the industry. Ragnar Anfinsen, Senior Architect CPE of Norway’s Altibox AS was kind enough to share his thoughts with us.
Although they’ve got it running in the lab and their core network, the next step will be to enable IPv6 Read More »
Tags: 6rd, Altibox, cgv6, Cisco, IPv6, NAT64, Service Provider, SP360