Network

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Unfettered high-speed Internet access at 24C3 is available via both wired and wireless networks. In the event of any network emergency, network outage or questions, contact the NOC Help Desk.

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24C3 Network

Latest Updates

The network is configured and should work everywhere. However, most of the time, the 802.11g network is totally overcrowded and even if you get a connection you can't even ping the gateway. We are aware of this, but we are afraid we are not able to do much about it. Please try to use wired network. Most wall sockets around the B and C rings are live!


Access

General

Your computer, should you choose to accept this mission and bring it along, will be able to obtain IP addresses via DHCP and IPv6 RS/RA. In order to facilitate a smooth functioning of the network, please adhere to the following dos and don'ts:

  • Do run up-to-date software on your computer. If you don't, you risk losing control over your equipment and it being used for nefarious purposes.
  • Do not run a DHCP server.
  • Do not run portscans on our subnets. This creates excessive traffic on the local network and unnecessary load on our switches and routers.
  • Do not run portscans or otherwise try to gain unauthorised access to outside networks. This leads to abuse complaints and worse.

Wired

Switches will be provided at strategic locations. You can plug your equipment into them. Please adhere to the following:

  • Do bring your own switch (if you can)! Especially if you want to take up a spot in the Hackcenter.
  • Do not disconnect, take, spill drinks over, monopolise or otherwise interfere with any switch provided by the organisation.

Wired Fix IP settings

Look at your Switch. There should be a sheet with all necessary information.

Wireless

  • Do not bring your own access point! It will interfere with the network provided by the organisation. Unless you're part of the OLSR community (only on channel 1). We're able to locate and remotely disable such rogue access points.
  • Do not configure your computer to create any Ad-Hoc network. Again, this interferes with all existing networks and will prevent others from successfully connecting.
  • Do use as little bandwidth as possible while connected to the wireless network. If you have something big to download, please find a wired network patch. Quit your filesharing applications such as BitTorrent and mldonkey. The wireless network is available for many more users if per-user bandwidth use remains low. The NOC may have to resort to traffic shaping or even refusing access to users or not to carry certain types of traffic if warranted.
  • If your WLAN NIC can do 5GHz (802.11a), please use this option. You will be rewarded with more bandwidth in a less crowded piece of spectrum.
  • Safety Notice: All WLAN traffic will be unencrypted! Everybody can sniff it! Please make sure you don't reveal passwords or more to the WLAN. Also make sure your WLAN drivers have been updated to newest available version. Some of them (Centrino, Netgear, D-Link, Apple, MadWiFi) have known buffer overflows. A few of those are remotely exploitable (see the Metasploit Project), so be careful out there!

Wireless Fix IP settings

Get your fix IP at one of the NOC Helpdesks. The other settings are:

SSID: 24C3-FIXIP
Netmask: /22 = 255.255.252.0
Gateway: 81.163.96.1
DNS-Server: 81.163.2.53

Servers

If you have a server you want connected, please contact the organisation. We can provide a dedicated 1000baseT or 10GbE port (bring your own XFP optics!). There will be a wiki page where you can list your server if you want to share its (legal) contents with the other participants.

For special purpose we will have some ESX servers. Please contact User:Panther_1 for more information.


FTP Servers

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