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Dj Offset's technoblog

Random thoughts on on life and technology

Train travel in scandinavia

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I just came home from a short trip to Sweden to visit some colleagues.
Since buying tickets for the swedish railways in Norway is somewhat difficult, we got a helping hand from Sweden.
The tickets were bought in Linköping on Monday, and sent by mail to Oslo.
Unfortunately they didn't make it by the time we left, but being able to predict that we had scanned copies sent to us as PDFs by e-mail.

This turned out to be no problem for SJ (Swedish Railways), who took us on our way from Oslo to Stockholm. We had verifyable seat reservations after all.

On our way back, we took a slightly different route, which took us to Gothenburg on the X2000. Nice train with Wifi and power outlets! - After all, the landscape wasn't that interesting :smile:

Anyway, I digress. Gothenburg was a place for a short break before boarding the train to Oslo. This was the last of five different trains we had on our trip which, but the first one not operated by SJ. This was NSB, the Norwegian State Railways.

Apparently, the NSB train conductor did not like our "fake" tickets, and he was having a bad day.
After some discussion, and a lecture on the ticket system works, he decided to give us a break and let us travel without buying new tickets.
I that wouldn't have happened if there weren't seven of us with these scanned tickets.

Anyway, I probably have a stack of fresh, yet obsolete tickets waiting for me in my mailbox tomorrow... :smile:
When is the digital world going to catch up with NSB?

MediaDefender e-mails leaked

Internal e-mails from the California based company MediaDefender has been leaked onto the internet. MediaDefender is best known for "decoying" popular file sharing networks with fake files. This includes responding to search requests and uploading fake .torrents to various BitTorrent sites.

The leaked e-mails reveal details about how they operate, which networks they target, and which they don't target.

Definitely worth a read.

In related news, also a phone conversation recording has also been leaked. This involves the New York State General Attorney and an ongoing investigation.

ADC, meet BBS (draft)

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I have for a long time wanted a usenet-style bulletin board system in ADC. It makes a lot of sense for a variety of reasons; first of all, it's a nice place to keep a hub FAQ, and can be used to post sticky messages, as an alternative to long welcome messages, that no-one actually reads anyway...

Read more...

Firewall hole punching

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There is an interresting article over at Heise Security about how Skype does it's firewall and NAT traversal for peer to peer connections.
The article can be found here here.

ADC: Changes suggested for ADC 0.12

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A draft of ADC version 0.12 was recently made public, and I have compiled a short list of areas I would like to change in it.
First of all, if you haven't yet read the full protocol draft, read it here to get an idea of what I'm trying to say here.

Read more...

ADC: Protocol simplicity

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That is a server in 500 lines of code

The ADC protocol is stabilizing and maturing, and now the implementations are popping up quickly. I've been working on QuickDC for a while now, and implementing an ADC back-end was a dream.

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ADC: an alternative to SIP?

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I have been working closely with the developers of DC++ on a new p2p protocol called ADC. Well, actually my main contribution to this was another protocol called DCTNG, which later spawned the ADC movement.

This is not only a nice protocol for file sharing, but can also be used for all sorts of things. One such thing could be call signaling, much more light weight than SIP or H.323. And certainly much easier to implement. No implementations take this beyond file sharing, at this point.