USB Host networking for Nokia N810

papabean · 2009-03-27 02:41:03

What is the archlinux equivalent to /etc/network/interfaces? I'm trying to setup USB networking with my Nokia N810 and from the Diablo Reference Guide, I need to add the following to /etc/network/interfaces:

mapping hotplug
        script grep
        map usb0
auto usb0
iface usb0 inet static
address 192.168.2.14
netmask 255.255.255.0
network 192.168.2.0
broadcast 192.168.2.255
up iptables -t nat -A POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE
up echo 1 > /proc/sys/net/ipv4/ip_forward
down iptables -t nat -D POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE
down echo 0 > /proc/sys/net/ipv4/ip_forward

How would I go about achieving the same in arch? Any help would be greatly appreciated.

Last edited by papabean (2009-03-27 22:53:06)

fukawi2 · 2009-03-27 03:09:37

The netcfg package would be good for what you're trying to achieve.
http://wiki.archlinux.org/index.php/Network_Profiles

Use the POST_UP and POST_DOWN directives...

papabean · 2009-03-27 03:11:41

Thank you.

I'll check out the wiki entry and post back with results.

papabean · 2009-03-27 03:32:55

Ok. I've read the wiki article. The POST_UP and POST_DOWN directives aren't mentioned there, but they are in the complete.example in /etc/network.d/examples.

I should be able to put together a usb0 profile except for the mapping directive in /etc/network/interfaces. In this case, it's tied to hotplug to auto-activate this profile when usb0 becomes available. How can I achieve the same result?

fukawi2 · 2009-03-27 06:07:55

I'm not familiar with what you're talking about -- are you saying the mapping directive makes this interface up and down when the USB device is hotplugged?

ifplugd might be able to handle this maybe? I'm not sure.

Last edited by fukawi2 (2009-03-27 06:08:14)

tomk · 2009-03-27 07:02:54

hotplug is deprecated, and hasn't existed on Arch for years. I know Debian tends to use older software versions, but I'm honestly amazed to hear they're still using it.

udev can run a command when a device is detected, so have a look at that.

Daenyth · 2009-03-27 10:57:17

Also, once you get this working, it's a great candidate for making a wiki article, to help any other users who run into the same issue

papabean · 2009-03-27 22:52:23

Ok. I've got partial (or full, depending on your perspective) success.

Had to insert usbnet and cdc_ether into the kernel:

# modprobe usbnet
# modprobe cdc_ether

I attempted to create the usb0 interface several times manually via ifconfig. Multiple failures. Connected the N810 and voila! The usb0 interface was created:

# dmesg | tail -1
usb0: register 'cdc_ether' at usb-0000:00:08.2-4, CDC Ethernet Device, 62:ea:f5:93:65:f1

The interface was there but no IP (of course). So, I setup the networking via ifconfig:

# ifconfig usb0 192.168.2.14 netmask 255.255.255.0 broadcast 192.168.2.255

Per the reference manual, still need to setup iptables and enable ip_forwarding:

# iptables -t nat -A POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE
# echo 1 > /proc/sys/net/ipv4/ip_forward

I imagine

# sysctl -w net.ipv4.ip_forward=1

should work as well.

Tested the usb networking:

~ ping -c 3 192.168.2.15
PING 192.168.2.15 (192.168.2.15) 56(84) bytes of data.
64 bytes from 192.168.2.15: icmp_seq=1 ttl=64 time=0.942 ms

I can ssh into the tablet as well, so I know that the usb networking is working correctly.

I tried to create a usb0 profile in /etc/network.d:

CONNECTION="usb0"
DESCRIPTION="IP over USB"

INTERFACE=usb0
#HOSTNAME=

# Interface Settings (use IP="dhcp" for DHCP)
IP="static"
IFOPTS="192.168.2.14 netmask 255.255.255.0 broadcast 192.168.2.255"
#GATEWAY=192.168.0.1

# Time to wait to connect to a network. Default 15.
TIMEOUT=10

# Commands to run at various stages of configuration
PRE_UP=
POST_UP="iptables -t nat -A POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE ; echo 1 > /proc/sys/net/ipv4/ip_forward"
PRE_DOWN=
POST_DOWN="iptables -t nat -D POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE ; echo 0 > /proc/sys/net/ipv4/ip_forward"

However, that does not work. I get the following message when trying to activate it via netcfg:

 #  netcfg usb0
 > usb0 is not a valid connection, check spelling or look at examples

Any ideas?

tomk · 2009-03-28 08:05:05

In netcfg profiles, CONNECTION can be either "ethernet" or "wireless". In this case, it's "ethernet" - netcfg doesn't care that it's ethernet-over-usb.

papabean · 2009-03-28 19:22:37

tomk wrote:

In netcfg profiles, CONNECTION can be either "ethernet" or "wireless". In this case, it's "ethernet" - netcfg doesn't care that it's ethernet-over-usb.

Thank you. Changing the CONNECTION to "ethernet" fixed the profile. I can start up the usb0 interface with # netcfg usb0 and network with the tablet over USB.

Arch Linux

#1 2009-03-27 02:41:03

USB Host networking for Nokia N810

#2 2009-03-27 03:09:37

Re: USB Host networking for Nokia N810

#3 2009-03-27 03:11:41

Re: USB Host networking for Nokia N810

#4 2009-03-27 03:32:55

Re: USB Host networking for Nokia N810

#5 2009-03-27 06:07:55

Re: USB Host networking for Nokia N810

#6 2009-03-27 07:02:54

Re: USB Host networking for Nokia N810

#7 2009-03-27 10:57:17

Re: USB Host networking for Nokia N810

#8 2009-03-27 22:52:23

Re: USB Host networking for Nokia N810

#9 2009-03-28 08:05:05

Re: USB Host networking for Nokia N810

#10 2009-03-28 19:22:37

Re: USB Host networking for Nokia N810

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