NTP service changes Nov 2012

Posted on 2012-11-15 by Guy Edwards

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 | 1 Comment

Using Microsoft Active Directory as the Authentication server for an SSL VPN on a Cisco ASA.

Posted on 2012-07-06 by Guy Morrell

Background We wanted to be able to run an SSL VPN for a second team (Team B) on one of our ASA pairs. It was important to give each team a different VPN pool for security reasons. The first team … Continue reading →

Posted in Cisco Networks, VPN | Tagged | Comments Off on Using Microsoft Active Directory as the Authentication server for an SSL VPN on a Cisco ASA.

Disabling 802.11b

Posted on 2012-07-02 by Robert Zachlod

We have been pondering the idea of disabling 802.11b for some time. Research into the subject has proved that it will be feasible. What’s the difference? 802.11b was the first standard of wireless networking conceived by IEEE in 1999. It’s … Continue reading →

Posted in Wireless | 4 Comments

Eduroam capping

Posted on 2012-04-27 by Robert Zachlod

There has been a lot of discussion recently about capping eduroam on ITSS-D. I’d like to take the opportunity to present the state of the centrally managed wireless network, but also to provide some rationale behind this decision, which was … Continue reading →

Posted in Wireless | Comments Off on Eduroam capping

ASA 5505 Transparent Mode DHCP and Memory fun

Posted on 2012-03-29 by Guy Morrell

We have a customer who uses a Cisco ASA 5505 in transparent mode to protect a small LAN. They did the right thing and took out SmartNet cover, but the reseller botched something and the TAC wouldn’t play with them … Continue reading →

Posted in Best Practices, Cisco Networks, DHCP, Firewall, General Maintenance | Comments Off on ASA 5505 Transparent Mode DHCP and Memory fun

Eduroam connectivity issues on Android 2.3.*

Posted on 2012-01-25 by Robert Zachlod

Since reports from users are on the increase, this blog post describes briefly the issue with eduroam connectivity on Android devices. Please be aware of it and inform your users, should they ask for advice. The problem is affecting some … Continue reading →

Posted in Wireless | 9 Comments

VPN NAT Changes

Posted on 2012-01-09 by Guy Morrell

What is this post about? We are planning to make a minor change to the way our VPNs NAT clients. For those who are interested, this blog post explains why and how we are doing this. Please note that these … Continue reading →

Posted in Cisco Networks, Documentation, General Maintenance, VPN | Comments Off on VPN NAT Changes

How to generate graphs with gnuplot

Posted on 2011-09-02 by Guy Morrell

Introduction During the JANET Carrrier Ethernet Trial we we took part in, I needed to plot some data based on our testing and came across gnuplot. It is actually quite simple to use and we’re doing so more and more … Continue reading →

Posted in Documentation, Productivity, Trend Analysis, Wireless | 1 Comment

Maintenance Work On Eduroam

Posted on 2011-09-01 by Guy Edwards

Just a slightly uneventful blog post aimed at our IT staff in colleges, departments and other units to let you know about some of the grittier routine work on Eduroam. This is a warts and all account of real life … Continue reading →

Posted in General Maintenance, Wireless | Comments Off on Maintenance Work On Eduroam

OUCS Backbone Network Naming and Numbering Conventions

Posted on 2011-08-15 by Guy Morrell

Introduction This blog post is intended to help ITSS in Oxford to better understand how the centrally provided network fits together with their own local networks. It is also hoped it will assist them in assessing the impact of any … Continue reading →

Posted in Backbone Network, Cisco Networks, Documentation, General Maintenance | 1 Comment