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Linux and eduroam: Monitoring
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
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Linux and eduroam: Building for speed and scalability
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
Cisco networking & eduroam: Rate Limiting Using Microflow Policing
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
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Linux and eduroam: link aggregation with LACP bonding
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
Linux and eduroam: Routing
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
Cisco networking and eduroam: Routing
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
Posted in Cisco Networks, eduroam
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Linux’s role in the new eduroam infrastructure
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
Building the new eduroam networking infrastructure
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
Posted in Cisco Networks, eduroam, Wireless
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I just received a spam email from my own address
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
Posted in Mail Relay
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NTP service changes Nov 2012
Over the next month we’ll be doing some work to consolidate our NTP stratum 2 and 3 services into what will hopefully (subject to antenna installation) be a four system stratum 1 service. All historical IP addresses and DNS names … Continue reading
Posted in Best Practices, General Maintenance, NTP
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