Author Archives: George Ross

Network upgrades

As part of our rolling programme of network upgrades and replacement of old kit, the following have either happened or are planned to happen soon: The remaining “gigabit” switches in the Forum will be replaced with current models, completing the … Continue reading

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Scanning for vulnerable systems

This article describes a couple of security enhancements which the Computing Team will be developing over the next few months. As I mentioned  last time, we have recently started scanning all our externally-visible machines for security vulnerabilities using the JANET … Continue reading

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Self-managed machines, particularly with firewall holes

Users of self-managed machines are reminded that School policy requires that they should make all reasonable efforts to secure those machines.  This applies particularly to those which have firewall holes. Machines must be running a current OS version, and patching … Continue reading

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Temporary wireless network reconfiguration on Forum upper floors

To aid with a research project by ICSA’s Wireless & Mobile Networking (WiMo) Group, we have asked IS to reconfigure the wireless access points for the top three floors of the Forum temporarily.  For the month of September the 802.11a … Continue reading

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Forum network upgrade this summer

It’s now very nearly five years since we moved into the Forum (time flies…), and in common with all our other computing equipment we now need to refresh the building’s network switches.  Rather than do the whole lot in one … Continue reading

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“DHCP” network problems 20th-22nd April

A number of users of our self-managed “DHCP” subnet experienced problems accessing the network starting some time on Saturday 20th up until 14:45 on Monday 22nd.  We believe that this was caused by a rogue DHCP server, and that disabling … Continue reading

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EdLAN upgrade work by IS Network Services

The following dates have been set for IS Network Services to perform essential replacement work on the core EdLAN network routers: Appleton Tower – Saturday 19th January 2013 08:00-10:00 (then at risk 10:00-12:00) The Appleton Tower work will cause an … Continue reading

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Wireless networking in the Forum

Wireless networking spectrum is a scarce resource.  In the 2.4GHz band (“802.11b/g”) there are essentially only three non-overlapping channels available.  Things are not quite as tight in the 5GHz band (“802.11a”), but there is by no means generous provision there … Continue reading

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Network security and robustness enhancements

New versions of network switch firmware often bring additional facilities along with bug-fixes.  We have recently been evaluating some security and robustness enhancements, with a view to rolling them out across the Informatics network.  In particular: DHCP protection, which will … Continue reading

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Cookies and “Similar Technologies”

As a result of a 2009 EU directive, the Privacy and Electronic Communications (EC Directive) Regulations 2003 (“PECR”) have been amended such that visitors to web sites must now give their prior consent to the placing of cookies.  The way … Continue reading

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