More like current experience...
Genghis, the first step is to find out who your examiners will be. Then, make sure you have spelled their names correctly in your thesis! Also, know their areas of expertise, and do some extra homework on them.
The most MOST important thing to do is ensure you understand all the references you errr referenced. You should know all the ins and outs of any protocols used, how they were developed, who by, when etc etc.
The general format will be for them to ask you a fairly shallow question about something you have written. Then they'll ask you a question about your answer. Apparently, the average level of questions candidates can answer is 3. Any more and you're laughing.
Expect the viva to last anything from 3 to 8 hours.
I'm very surprised they have only given you 2 weeks warning. We get a couple of months at least.
Good luck!