• Home

    • Welcome to the next step of Collaboration within the Cisco technical community in Belgium and Luxembourg
  • Categories

  • Archives

  • Cisco Belgium Tweets

Fosdem 2011, IPv6 on Cisco’s Wireless

Over the last week-end, a group of Cisco’s volunteers, assisted the FOSDEM to get a proper network up and running; this is our story !

What is FOSDEM ?

FOSDEM, the Free and Open Source Developers’ European Meeting, is the biggest free and non-commercial event organized by and for the community. It’s taking place in Brussels for the last 11 years.

The event has been growing over the years and now welcome ~5000 visitors for two days of keynotes, speeches, lightning talks covering many many FOSS projects.

A group of volunteers from Cisco Belgium is helping FOSDEM to build the Internet access network, using Wireless.

What is special with this network ?

The audience you have at FOSDEM is very fund of network access, and also pretty knowledgeable, so not the common user base you’d find in an enterprise or another event. So pressure on getting it right and highly secure on the infrastructure side is key. An example of this was being able to detect and react nearly instantly to rogue DHCP/DNS server trying to poison the network. The Cisco Security toolkit embedded  in the Catalyst switches prevented this to be possible.

What was deployed and how was it configured ?

WAN Edge

We were provided by Belnet with a one Gigabit uplink within the Internet Exchange located on the ULB campus in Ixelles. The peering was done using an ASR 1004 running IOS-XE 3.1(2) and fiber uplink.


From the ASR a fiber, provisioned on the ULB underground fiber path, is going to our main comm’s room and terminated on a 12 ports 10Gig  fiber switch, a Catalyst 3560E-12D. And from the comm’s room, all 4 access switches, being a mix of 24 and 48 10/100/1000 PoE+ switches (3560-X series)

The Access-points were a mix of 1142 and 1252 abgn, depending of the site-specific needs.

Management and monitoring

On the Wireless, we were using the combined ULB and FOSDEM WLAN’s into one single WLAN. Maintaining full benefit of centralized wireless controllers for management, monitoring and reporting.

Reporting of network statitics and monitoring was done using Munin and Cisco WCS. We were also serving our own DNSv6 (& v4) server for local users.

Lastly we tested IPv6 only connection using DNS64 and NAT64 built on FreeBSD kernel. This has be proven to work really well and as such we are thinking of providing only IPv6 addresses at next year conference, but  🙂


The complete config used for the main router has been published at the Support Community website

Finally let’s the results speak for themselves:

Over the w-e, we had 4171 unique users on the WLAN and a peak at 1672 concurrent users on Saturday around 16.00 CET

Interesting to note is that amongst those 4171 unique devices on the FOSDEM network,  595 were Mac/iPhone/iPad, 452 were HTC devices, 341 Nokia, 56 Samsung, 23 RIM (Blackberry) and 806 were using an Intel chipset…

What about IPv4 to IPv6 ratio ?

We have seen about 1.85k IPv6 link-locals (==total devices whith IPv6 enabled) while 2.18k IPv4 addresses were cached at the router; which means 84% devices had IPv6 enabled !!

And a total of 1.08K global IPv6 addresses( == IPv6 used); that is 49.5% actually went to the v6 Internet.

So would said IPv6 was lagging adoption ?

If you want to have a look at how it was last week-end, check the video below:

4 Responses

  1. […] This post was mentioned on Twitter by Cisco BeLux and Jerome Paquay, Jerome Paquay. Jerome Paquay said: RT: @Cisco_BE @fosdem 2011, IPv6 on Cisco's Wireless http://wp.me/pUxyk-ap #fosdemnetwork […]

  2. […] Cisco volunteers’ work was great too. Network and uplink worked like a charm. […]

  3. this fosdem is very good stuff in wireless technology I like it…

  4. […] Check out the full article. […]

Comments are closed.

%d bloggers like this: