Linux and eduroam: RADIUS

Posted on 2015-02-16 by Christopher Causer

A service separate from, but tightly coupled to, eduroam is our RADIUS service. This is the service that authenticates a user, making sure that the username and password typed into the password dialog box (or WPA supplicant) is correct. Authorization … Continue reading →

Posted in eduroam, Linux | Tagged , , , | 3 Comments

Linux and eduroam: Monitoring

Posted on 2014-10-20 by Christopher Causer

For the past few months my colleague John and I have been trying to explain the inner most details of the new eduroam service, how it’s put together, how it runs and how it’s managed. These posts haven’t shied away … Continue reading →

Posted in eduroam, Productivity | 1 Comment

Linux and eduroam: Building for speed and scalability

Posted on 2014-08-21 by Christopher Causer

When upgrading the eduroam infrastructure, there was one goal in mind: increase the bandwidth over the previous one. The old infrastructure made use of a Linux box to perform NAT, netflow and firewalling duties. This can all be achieved with … Continue reading →

Posted in eduroam, Firewall, Linux | Tagged , | 3 Comments

Cisco networking & eduroam: Rate Limiting Using Microflow Policing

Posted on 2014-08-11 by John Swain

This is my final post on the interesting technical aspects of the new networking infrastructure that support the eduroam service around the university. This post covers the finer technical details of how we currently rate limit client devices to 8Mbps … Continue reading →

Posted in Cisco Networks, eduroam | 1 Comment

Linux and eduroam: link aggregation with LACP bonding

Posted on 2014-07-31 by Christopher Causer

In previous posts, I discussed the roles of routing and NATing in the new eduroam infrastructure . In one sense, that is all you need to create a Linux NAT firewall. However, the setup is not very resilient. The resulting … Continue reading →

Posted in eduroam, Linux | Tagged , , , | 8 Comments

Linux and eduroam: Routing

Posted on 2014-07-21 by Christopher Causer

This is a continuation of the series of blog posts describing the Linux servers in the middle of the new eduroam infrastructure. Packets sent by your eduroam client eventually end up on one of the Linux boxes in the eduroam … Continue reading →

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Cisco networking and eduroam: Routing

Posted on 2014-06-27 by John Swain

This is the first post in a series discussing some of the finer details of the networking setup for the new eduroam infrastructure that went into production last month. In this post, I will be covering the IP routing setup … Continue reading →

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Linux’s role in the new eduroam infrastructure

Posted on 2014-06-05 by Christopher Causer

People within Oxford University may be aware that the eduroam service has recently been upgraded to increase its bandwidth, which was saturated on the old infrastructure. This included the replacement of two Linux servers which provide services key to the … Continue reading →

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Building the new eduroam networking infrastructure

Posted on 2014-05-30 by John Swain

As many of you around the university are likely to be aware of by now, this month we migrated to a new backend infrastructure to support the eduroam service across the city. This blog post has been written to give … Continue reading →

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I just received a spam email from my own address

Posted on 2013-03-08 by Guy Edwards

Our team was asked to answer some queries about how it’s possible to receive mail that has been forged as being from your email address. This article slightly overlaps with a previous article in 2011 that covered similar ground. Please note … Continue reading →

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