Hi,

Here is how I configured a N900 as a router when connected to my laptop with the USB cable in "PC Suite" mode.

on the N900
/etc/apt/sources.list
deb http://repository.maemo.org/extras-devel/ fremantle free
apt-get install iptables
http://wiki.maemo.org/Kernel_Power#I...el_from_extras
apt-get install kernel-power-settings
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
iptables -t nat -A POSTROUTING -o gprs0 -j MASQUERADE
cat /etc/network/interfaces
iface usb0 inet static
address 192.168.3.15
netmask 255.255.255.0
ifup usb0

on the laptop
sudo ifconfig usb1 192.168.3.14
sudo route add default gw 192.168.3.15