Re: g_ether usb0 static IP

Steve G

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Oct 24, 2012, 10:51:02 AM10/24/12

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I did some experiments with connman and found that connman does not appear to know about the g_ether usb ethernet device.

When I did the following per http://www.gigamegablog.com/2012/02/06/beaglebone-linux-101-assigning-a-static-ip-address-with-connman/ it prints nothing:

cd /usr/lib/connman/test/
./get-services

However when I plug a network cable into the ethernet (eth0) it reports information about that.

I'm still digging to find where/how the usb0 ethernet device is configured.

SuperJet

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Oct 24, 2012, 3:20:04 PM10/24/12

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You need to replace the “iface eth0 inet dhcp” line with hard-coded settings for your IP address, gateway, and DNS servers, although I've quit Angstrom, compared to Ubuntu, i found many plus points instead of long road around, but all ways goes to Rome, you can find the Default settings is

==========================

# Wired or wireless interfaces

auto eth0

iface eth0 inet dhcp

iface eth1 inet dhcp

# Ethernet/RNDIS gadget (g_ether) or LAN9514

auto usb0

iface usb0 inet dhcp

# Bluetooth networking

iface bnep0 inet dhcp

==========================

You can change it like this: 'Note it is my IP's change according to your Lan settings:

#iface eth0 inet dhcp
iface usb0 inet static
address 20.20.20.20.
netmask 255.255.255.0
network 20.20.20.0
broadcast 20.20.20.255
gateway 20.20.20.1
dns-nameservers 20.20.20.1

============================

On Wednesday, October 24, 2012 2:14:25 AM UTC+3, Steve G wrote:

I have an Angstrom BeagleBone and would like to configure it to come up with a static IP address on usb0 the g_ether interface.
Right now I hand configure usb0 for static IP on each boot which is inconvenient. I've heard about connman but can't figure out how to use it or even if that's what I need to mess with.

Anyone have experience with this?

Steve G

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Oct 24, 2012, 3:47:39 PM10/24/12

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I believe that would be specified in /etc/network/interfaces. Angstrom on the BeagleBone doesn't have that file.

Steve G

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Oct 24, 2012, 7:34:33 PM10/24/12

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OK, figured it out. The usb0 interface is not configured using connman like eth0 is. It's configured using udev.

In /etc/udev/rules.d is a file udhcpd.rules. This file contains the rules for what actions to perform when usb0 gets plugged in and when it's unplugged.

The contents are:

SUBSYSTEM=="net",ACTION=="add",KERNEL=="usb0",RUN+="/sbin/ifconfig usb0 192.168.7.2 netmask 255.255.255.252",RUN+="/bin/systemctl start udhcpd.service"

SUBSYSTEM=="net",ACTION=="remove",KERNEL=="usb0",RUN+="/bin/systemctl stop udhcpd.service"

You can see from line 1 where the static IP address of 192.168.7.2 is assigned and also where the DHCP server is started.

Line 2 stops the DHCP server when usb0 is unplugged.

For my purposes I removed the command to start DHCP (i.e. removed RUN+="/bin/systemctl start udhcpd.service") and deleted line 2.

I then changed the IP address from 192.168.7.2 to my desired IP address as well as the netmask.

Voila, usb0 is now a simple static IP address of my choosing with no frills.

Víctor MV

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Aug 31, 2013, 6:12:32 AM8/31/13

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Hi Steve,

I followed your exact instructions but my usb0 interface is still getting the 192.168.7.2 address. No clue how to modify this. I even tried to remove this udhcpd.rules but nothing.

Actually i'd like to remove this interface totally because i think the usb-over-ethernet is causing the kernel to crash

root@beaglebone:/var/lib/connman# [ 600.197574] INFO: task systemd-udevd:346 blocked for more than 60 seconds.

[ 600.204837] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[ 600.213115] Kernel panic - not syncing: hung_task: blocked tasks

[ 600.219439] [<c001051d>] (unwind_backtrace+0x1/0x8c) from [<c0373f21>] (panic+0x55/0x14c)

[ 600.228011] [<c0373f21>] (panic+0x55/0x14c) from [<c00617b3>] (watchdog+0x153/0x1a0)

[ 600.236129] [<c00617b3>] (watchdog+0x153/0x1a0) from [<c003ca4b>] (kthread+0x61/0x72)

[ 600.244336] [<c003ca4b>] (kthread+0x61/0x72) from [<c000c6fd>] (ret_from_fork+0x11/0x34)

[ 631.278836] gadget: rndis req21.00 v0000 i0000 l12

[ 631.283984] rndis_msg_parser: RNDIS_MSG_HALT

[ 631.295282] CAUTION: musb: Babble Interrupt Occurred

[ 631.300482] gadget: reset config

[ 631.303947] gadget: rndis deactivated

[ 631.307869] usb0: gether_disconnect

[ 631.311542] gadget: acm ttyGS0 deactivated

[ 631.367452] CAUTION: musb: Babble Interrupt Occurred

[ 631.455212] gadget: high-speed config #1: Multifunction with RNDIS

[ 631.461773] gadget: init rndis

[ 631.465058] gadget: RNDIS RX/TX early activation ...

[ 631.470441] usb0: qlen 10

[ 631.473180] gadget: rndis_close

[ 631.476554] rndis_set_param_medium: 0 0

[ 631.480564] rndis_set_param_dev:

[ 631.483941] gadget: activate acm ttyGS0

[ 631.488044] gserial_connect: start ttyGS0

[ 631.492276] gadget: acm ttyGS0 serial state 0003

[ 631.497201] gadget: set_config: interface 4 (Mass Storage Function) requested delayed status

[ 631.506112] gadget: delayed_status count 1

[ 636.458230] gadget: suspend

[ 636.464771] CAUTION: musb: Babble Interrupt Occurred

[ 636.469964] gadget: reset config

[ 636.473429] gadget: rndis deactivated

[ 636.477346] usb0: gether_disconnect

[ 636.481006] gadget: acm ttyGS0 deactivated

[ 636.539648] CAUTION: musb: Babble Interrupt Occurred

[ 636.627806] gadget: high-speed config #1: Multifunction with RNDIS

[ 636.634363] gadget: init rndis

[ 636.637647] gadget: RNDIS RX/TX early activation ...

[ 636.643026] usb0: qlen 10

[ 636.645764] gadget: rndis_close

[ 636.649138] rndis_set_param_medium: 0 0

[ 636.653145] rndis_set_param_dev:

[ 636.656522] gadget: activate acm ttyGS0

[ 636.660624] gserial_connect: start ttyGS0

[ 636.664849] gadget: acm ttyGS0 serial state 0003

[ 636.669773] gadget: set_config: interface 4 (Mass Storage Function) requested delayed status

[ 636.678685] gadget: delayed_status count 2

Any ideas about how to totally disable usb0 from connman?

Steve G

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Aug 31, 2013, 6:50:57 AM8/31/13

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I've seen that "babble interrupt" error before. I don't know exactly what it means but it's a hardware level usb problem.

It sounds like you have more basic problems with your board that software configuration. Has the usb ever worked?

SG

Brandon I

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Sep 26, 2013, 7:47:44 PM9/26/13

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Looking at my beaglebone with the 7-31 production image, there's a systemd service called storage-gadget-init. Check out what it's doing with "systemctl status storage-gadget-init":

Loaded: loaded (/lib/systemd/system/storage-gadget-init.service; enabled)

Active: active (running) since Tue 2000-01-04 00:57:51 UTC; 13 years 8 months ago

Main PID: 122 (g-ether-load.sh)

CGroup: name=systemd:/system/storage-gadget-init.service

|-122 /bin/sh /usr/bin/g-ether-load.sh

`-353 /usr/sbin/udhcpd -f -S /etc/udhcpd.conf

I'ts running a script g-ether-load.sh with a line at the end:

/sbin/ifconfig usb0 192.168.7.2 netmask 255.255.255.252

then fires up the dhcp server with the configuration from /etc/udhcpd.conf that sets the ip range for the dhcp server for the usb host, acting as a dhcp client, the usb cable is connected to:

start 192.168.7.1

end 192.168.7.1

interface usb0

max_leases 1

option subnet 255.255.255.252

So, you'll have to change both files with the subnet in mind.

I don't know if the udev rule comes into play at all. I deleted the file, rebooted with usb plugged in, I get an ip. Rebooted with usb disconnected, connect usb, get an ip. Probably some old thing that someone forgot about.

"Can't Linux without a little wtf." - Bob Dole, 1978

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