N900 Ad-hoc WiFi Hotspot


[edit] Working solution

See http://talk.maemo.org/showthread.php?t=73406

It may be noted, that scanning for networks on the N900 seems to disconnect everything. So starting wlancond seems to be a bad solution, better stop it.

[edit] Old article

This method works but is not usable for more than a proof of concept because it suffers 40% packet loss at close range between the N900 and the laptop.

[edit] On the N900

  1. Enable extras-devel
  2. Install iptables at a terminal with root access:
    apt-get install iptables
  3. Install kernel-power-settings (see the detailed installation instructions):
    apt-get install kernel-power-settings
  4. Connect to the Internet with GPRS
  5. Setup iptables to allow forwarding:
    echo 1 > /proc/sys/net/ipv4/ip_forward
    iptables -t nat -A POSTROUTING -o gprs0 -j MASQUERADE
  6. Bring up te ad hoc wireless network:
    iwconfig wlan0 mode ad-hoc channel 3
    ifconfig wlan0 up
    iwconfig wlan0 essid N900

[edit] On the Client

Simply connect to the ad hoc wireless network.

In this configuration, a DHCP server is not run by the N900, so addresses will have to be manually assigned to clients.

Note that on Android devices, a patched "wpa_supplicant" file may be necessary to see the network.