Archive for 2013

This weblog brings you news on Greenhost and recent developments in the areas of sustainability, privacy, web hosting, Internet and anything else we think is relevant.

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Cryptocat: safe chats with kittens

Cryptography is often seen as scary and unusable by users, that is why we are exited that as of today we have an important and very fluffy new website on our servers. Cryptocat enables you to have a safer chat with everyone. Cryptocat combines a very friendly user interface with strong end-to-end encryption and fluffy feline friends. A great match to make using cryptography less hard and more fun.

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Multi-queue network interfaces with SMP on Linux

Building a router with Linux is a viable alternative to commercial products in many applications. In this article, we explore the process of optimising Linux for the best packet-forwarding performance by exploiting symmetric multiprocessing (SMP) and Ethernet interfaces with multiple queues. We take advantage of the Linux kernel features known as Receive Packet Steering (RPS), Transmit Packet Steering (XPS), and IRQ affinity.

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Spam? Not Spam? Tracking a hijacked Spamhaus IP

Today we noticed we that a lot of our incoming email was being marked as spam. Since this included many messages that were clearly not spam, we decided to investigate more deeply. We found that a third party was subverting the Spamhaus service using a routing-based attack.

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