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Blogs

15

Sep

2013

Worked on python script that accesses the bookings database and runs the appropriate openstack commands when bookings start and end such as the changing of user roles and the suspending of instances linked to the user.

14

Sep

2013

Started writing the final report this week.

10

Sep

2013

Read a paper about T-Entropy and started implementing a detector that uses sliding windows, calculates some statistics, assigns an appropriate character/"class" to each window, which will then be concatenated into a string of characters, which will in turn be used to obtain the average T-Entropy for a sliding window. However, NNTSC/Netevmon was down until Wednesday so I didn't get to test it after that.

The rest of the week was spent taking care of GA duties, marking a ridiculous amount of assignments, updating Moodle grades, yadda yadda. Didn't manage to get any work done on the project, unfortunately.

Next week, I plan on working on the T-Entropy detector some more, especially adding new statistics and trying to figure out a combination of stats that "work".

10

Sep

2013

I've been writing the proposal and thinking about how things will scale.

To poll both ends of a path I can add an extra flow on each switch specifying the ingress switch, so that when a packet leaves the system it is counted with the other packets that entered the fabric at that switch. This will require tables and stacked mpls labels (3 layers of mpls), though it could probably be made to work with two.
This way I can poll both ends of a path, but inbetween I am aggregating paths, since the alternative means I have a number of flows to create paths on each switch that is quadratic in the number of switches in the fabric. This is going to be a complication for accurately locating problems just by polling counters.

10

Sep

2013

The internet simulator has been run using a complete data team from Caida. I was necessary to increase the allowed heap size and the trace list to be carried out was reduced to 100,000.

The next round of scamper data collection on Caida and Planetlab has been initiated.

The modification to the analysis of scamper data has been further updated to count diamonds based on the same load balancing node. There is a certain amount of trial and error involved, so it will take some more time to do this.

09

Sep

2013

Spent some more time looking at the broken NAT in virtual box (it looks
to use lwip) and how it was affecting my traceroute tests. In doing so,
found and fixed a few issues where incorrectly sized packets could be
sent, or correctly sized packets could be sent with incorrect length
fields. After switching from NAT to bridged mode everything seems to
work properly.

A lot more time than I like was spent trying to differentiate between
problems caused by the NAT and problems with my tests. The ability to
run tests as standalone programs was very helpful for this and made it a
lot easier to pinpoint problems such as the NAT incorrectly sizing
embedded packets in ICMP responses.

09

Sep

2013

Spent most of the week on leave, so not much got done this week.

In the time I was here, I fixed a number of bugs with the auto-scaling summary graph that occurred when there was no data to plot in the detail view.

I implemented yet another new algorithm for trying to determine if a time series is constant or noisy, as the previous one was pretty awful at recognising that the time series had moved from constant to noisy. The new one is better at that, but still appears to have problems for some of our streams -- it now tends to flick between constant and noisy a little too frequently -- so it will be back to the drawing board somewhat on that one.

08

Sep

2013

Continued work on the change-point detection algorithm, optimised memory usage so now only a single vector of probabilities is stored. Testing against data shows that this is too sensitive at the moment.

I got quite busy this week with assignments so I only worked Wednesday.

07

Sep

2013

Again not a lot to report this week as my time was spent on other assignments

07

Sep

2013

Tested out the effect of manual nova compute access policy changes. Have decided on project-role-based access control as opposed to project-based access control in order to minimise changes to the access policy file. Also need to test the ability to custom create user accounts on the admin panel of the dashboard.