Nico Nico Douga, due to DDoS attack from more than 3000 units suspended

The affiliated company of Dwango, 2 channel manager, Hiroyuki Nishimura is a director of the video distribution service that Niwango is doing, "Nico Nico Douga" site has undergone DDoS attacks from the 20th and 22 We stopped the service on the evening.

Terminals that are carrying out attacks are still increasing today, and it seems that they are increasing to more than 3000 units around 5 o'clock this morning.

the detail is right below.
Nico Nico Video (β) | Maintenance Notice

DDoS attack against Nico Nico Douga started from 20th is a SYN flood for WEB server and message server. At the midnight 21st day, it was an attack from about 30 terminals at the same time, so we blocked it manually, but last night it was over 1000 and stopped the service. Terminals conducting attacks are increasing even after the service is stopped, and it has increased to more than 3000 units around 5 o'clock this morning.

Currently, since Dwango's mobile site on the same network as Nico Nico Douga is beginning to be affected, we will temporarily stop the service and plan to separate the network today.

Please wait for a while until service restart.

(Note on February 23, 2007, 11: 20)

screenshot.


By the way, the DDoS attack is an attack that a large number of PCs send packets to a specific server all at once from a plurality of networks and try to stop the function by overflowing the communication path, actually sending a packet PC seems to be infected by a Trojan horse etc from a malicious third party so as to cooperate with the attack.

For the DDoS attack, the following links are detailed.

What is DDoS [Distributed Denial of Service] - Meaning · Description: IT term dictionary e-Words

Also, it is probably a bot network that is carrying out this attack. The following article is detailed about the bot network.

What is the "10 major threats" shown in the Information Security White Paper 2006 edition? - GIGAZINE

About Various Malware Developed by Open Source Method - GIGAZINE