Networking Archive

Converting your InnoDB MySQL server to TokuDB (how we did it)

What is TokuDB? TokuDB is a storage engine for MySQL and MariaDB that dramatically improves the performance of large databases (typically 50 GBs or larger). By replacing 40-year-old B-tree technology with patented Fractal TreeĀ® technology, TokuDB speeds indexing by 10x or more, and reducing the size of the database by upt o 90%. Because of

ip_conntrack: table full, dropping packet / conclusions about connection tracking

The problem Recently one of our clients started a very large campaign and my servers got hit by twice the traffic it was handling normally. We actually didn’t have any problems, but from time to time you would notice this error message on our main firewall: ip_conntrack: table full, dropping packet Investigation I have seen this

Installing Vyatta 6.6 R1 with software raid 1

Intro For all my routers I usually choose at least some level of raid. As routers usually don’t need any disk performance, simple raid 1 – mirroring is enough to sustain disk failure and ensure server continues to work. Now let’s get busy and install our latest Vyatta on our server. Prerequisites To ensure fast

Vyatta – SNAT – Randomly rotating public IP addresses

The problem Our contextual system uses bots/spiders to leech data from our customer’s websites in order to parse them and use extracted text for further content analysis. This means we have setup few servers that run bots/spiders. Can you imagine if 20 bots started leeching websites hosted on same webhosting using only one ip? That could be considered as sort of

Open DNS Resolvers in Slovenia | How Slovenian insecure DNS servers (possibly) participated in largest DDOS attack in the history

Foreword Recently we have faced one of largest DDOS attacks in history. The attacks were launched against SPAMHAUS website and about 300Gbit/s was thrown at them. The main reason attackers could reach such enormous traffic is by using open DNS resolvers to amplify the attacks. It’s so called Smurf attack with few modifications made. Smurf is