Author Archives: George Ross

OpenVPN configuration files

The new OpenVPN configuration files which we have been beta-testing for the last month or so have now gone live, and our computing.help pages have been updated. These configuration files are intended to have essentially the same effect as the … Continue reading

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OpenVPN beta-testers wanted

Several people have opened support tickets recently asking about warning messages being produced by OpenVPN when connecting to Informatics.  The reason for these warnings has been that the configuration syntax has gradually changed over time to accommodate new features, and … Continue reading

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Forum core network upgrade

We will shortly be upgrading the remaining Forum core network switch.  With this one there will be some (expected) visible effects, as follows: This switch is normally the “root bridge” for the entire Informatics network.  While we do have extensive … Continue reading

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Network disruption yesterday

Apologies for the short network disruption yesterday afternoon.  It was caused by a 10Gbps forwarding loop, which was created as the second-last fibre was being connected as part of our core switch upgrade programme.  As soon as we realised there … Continue reading

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Informatics network core upgrade

We will shortly begin the process of upgrading the switches which form the core of the Informatics network in the Forum and Appleton Tower.  The network has enough resilience built into it that this can happen mostly transparently to users.  … Continue reading

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Forum UPS work on Saturday 3rd

The Forum server rooms are covered by a pair of Uninterruptible Power Supplies (UPSes), one of which has developed a fault in its interface to the outside world.  As a result we can neither query its status, nor expect it … Continue reading

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Informatics to host a sponsored RIPE atlas anchor

Informatics has been selected to host one of the first five sponsored RIPE atlas anchors!  The other four sites are in Macedonia, France, Romania and Albania. The RIPE atlas system consists of several thousand network “probes” dotted around the world.  … Continue reading

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Beware of Domain-squatters

Please take care when you type internet domain names, whether into an address box or at the command line! Domain-squatters are people who register internet domain names which are very similar to other “real” names.  They do this in the … Continue reading

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IPv6

The “IPv6 investigation” project has made good progress since my previous post in January.  We have had global connectivity since February, and have been testing on a variety of subnets since then, including all of our “server” subnets, and most … Continue reading

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Informatics Network “Requirements”

As input to a review which Information Services are conducting into EdLAN, the network which ties the University together, I have written a document which describes the Informatics network and the various “requirements” that guide its design and management. Please … Continue reading

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