Author Archives: George Ross

Additional OpenVPN configurations

EdLAN is increasingly embracing site-local (“RFC1918“) addresses, and as a consequence we are beginning to see services being given such addresses. (A good argument could be made that the use of such addresses implies that they should never be accessible … Continue reading

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IPv6 addresses

As we prepare to enable IPv6 on the “static self-managed” wires, there are a few aspects to IPv6 addressing which you need to know. The most obvious difference between IPv4 and IPv6 addresses is that the latter are 128 bits … Continue reading

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IPv6 for the Forum static-self-managed subnets

Following the introduction of IPv6 for the Forum self-managed dynamic-address subnet (and the ironing out of a couple of teething problems), we would now like to roll IPv6 out to the two “static-self-managed” subnets (“SM164” and “SM197”). We propose enabling … Continue reading

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IPv6 for Forum self-managed subnets

It’s now more than three years since we implemented IPv6 for the School’s managed Linux (DICE) desktops and servers, and in that time we have seen very few issues which were specifically related to IPv6.  We were not, unfortunately, able … Continue reading

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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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