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Host Side

Kernel options

Compile kernel with correct options

Device DriversUSB supportUSB Network Adapters Multi-purpose USB Networking Framework Simple USB Network Links (CDC Ethernet subset)[*]     Embedded ARM Linux links (iPaq, ...)USB Gadget Support<*> Support for USB Gadgets<*> USB Gadget Drivers (Ethernet Gadget (with CDC Ethernet support))

NetworkingNetworking support (NET [=y])Networking optionsNetwork packet filtering (replaces ipchains) (NETFILTER [=y])IP: Netfilter Configuration<*> Connection tracking (required for masq/NAT)

OBS : Feel free to add more options as I,ve done.;)

USB Hotplug

Install hotplug (Be carefull)

         apt-get install hotplug

Load modules

  modprobe  usbnetmodprobe  cdc_ether

Configure USB interface

Add to file /etc/network/interfaces

 iface usb0 inet static       address 192.168.2.14       netmask 255.255.255.0 broadcast 192.168.2.255

Target side(nokia770)

Activate USB network on device

Create connection on device

http://maemo.org/maemowiki/HowToSetUpUsbNetworkingDebian

Host side

Activate USB network on host

  ifup usb0

Now,connection is OK. You can test using comand ping. (devive <-> host)

NAT

Install iptables to create a NAT.

  apt-get install iptables

Create and add to file /etc/init.d/iptables

  #!/bin/bash

iniciar(){#modprobe iptable_natecho 1 > /proc/sys/net/ipv4/ip_forwardiptables -t nat -A POSTROUTING -o eth0 -j MASQUERADEiptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -m  tcpmss --mss 1400:1536 -j TCPMSS --clamp-mss-to-pmtu}

parar(){iptables -F -t nat}

case "$1" in"start")iniciar;;"stop")parar;;*)echo "Use os parâmetros start ou stop"esac

This is going to be our script to start NAT. So,turn it executable and execute :

             chmod +x /etc/init.d/iptables         /etc/init.d/iptables start

And now , the device is connected to network (device <-> host <-> network)

  Nokia770:~# ifconfiglo        Link encap:Local Loopback     inet addr:127.0.0.1  Mask:255.0.0.0     UP LOOPBACK RUNNING  MTU:16436  Metric:1     RX packets:0 errors:0 dropped:0 overruns:0 frame:0     TX packets:0 errors:0 dropped:0 overruns:0 carrier:0     collisions:0 txqueuelen:0     RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

usb0      Link encap:Ethernet  HWaddr BA:C3:E8:40:38:1F     inet addr:192.168.2.15  Bcast:192.168.2.255  Mask:255.255.255.0     UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1     RX packets:241 errors:0 dropped:0 overruns:0 frame:0     TX packets:249 errors:0 dropped:0 overruns:0 carrier:0     collisions:0 txqueuelen:1000     RX bytes:24380 (23.8 KiB)  TX bytes:82482 (80.5 KiB)Nokia770:~#Now you can ping.

Some links used to made this small howto :

http://www.falkotimme.com/howtos/debian_kernel2.6_compile/

http://embedded.seattle.intel-research.net/wiki/index.php?title=Setting_up_USBnet

http://www.falkotimme.com/howtos/debian_kernel2.6_compile/

http://handhelds.org/moin/moin.cgi/UsbNet

http://maemo.org/maemowiki/HowToSetUpUsbNetworkingDebian