Not able to access Bela on network

anna

Hi, I changed the /etc/network/interfaces file so that the WIFI network name corresponded to my Wifi network. I then restarted the Bela and can no longer access the Bela's IP address. Is there a way to access the Bela file system so that I can change the interface file back to what it originally was?

Thanks in advance!

giuliomoro

You probably have to access via the virtual serial interface. On Mac you'd do screen /dev/tty.usb*bela* and then hit enter, type root and hit enter again. On Windows you should use Putty to perform a connection over the virtual serial port.

anna

Update: I can access the Bela via Putty (using the serial connection), but the network interface is still not working even after changing the original /etc/network/interfaces file to what it was. Do I need to run ifup/ifdown again?

anna

Hi Giulio,

Thanks for your response. Yes, I am able to access over the serial port via Putty. I tried changing the network file back to the original (i.e. commenting out everything related to wlan) but the connection to the IP address is still not working.

Below is my /etc/network/interfaces file. How can I restore the original network settings?

anna

alt text

giuliomoro

That looks good I think. Here's the original for reference:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# USB RNDIS gadget (Windows / Linux compatible)
auto usb0
iface usb0 inet static
    address 192.168.6.2
    netmask 255.255.255.0
    network 192.168.6.0

# USB NCM gadget (macOS / Linux compatible)
auto usb1
iface usb1 inet static
    address 192.168.7.2
    netmask 255.255.255.0
    network 192.168.7.0

# The loopback network interface
auto lo
iface lo inet loopback

# Ethernet
allow-hotplug eth0
iface eth0 inet dhcp
# Example to keep MAC address between reboots
#hwaddress ether DE:AD:BE:EF:CA:FE

# WiFi Example
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
# The lines above should work if you have a wifi interface called wlan0.
# To see the actual name of your interface, run
#   ip a
# and identify it among the ones listed then replace `wlan0` above with the name of your interface
# To provide credentials to your network, run the following at the command line:
#    wpa_passphrase YourNetworkName YourNetworkPassword >>/etc/wpa_supplicant/wpa_supplicant.conf
# then:
#     ifdown wlan0; ifup wlan0
# where `wlan0` is the name of your interface as found above.

After changing the file you need a reboot. Could it be that you also made some changes to the DHCP in /etc/dhcp/dhcp.conf that you need to reverse?

anna

Hi giuliomoro, thanks for your response. I did reboot the Bela (just by unplugging it) but it is still not working. Do I need to run a reboot script instead? Alternately, is it possible that when I ran the ifup networkname; ifdown networkname commands some additional files on the Bela were changed that I also need to revert back to their original state?

Any help troubleshooting is greatly appreciated as it seems that simply commenting out the wifi interface lines in /etc/network/interface is not working...

giuliomoro

anna fup networkname; ifdown networkname commands some additional files on the Bela were changed that I also need to revert back to their original state?

No, those don't perform any changes on disk

You'll need to undo whatever changes you made and restore all the files you changed to the original state.

anna

giuliomoro Great, I just realized that there was one line in the network config file that I had not reverted back to the original! All is working now. Thanks again for your help!

For future reference, can I connect the Bela to the internet by simply plugging in an ethernet cable from my internet wifi box (LAN output) without changing the network configuration file? If so, does my internet network assign the Bela a different IP address from the default and how would I find this?

Thanks in advance,
Anna

giuliomoro

anna For future reference, can I connect the Bela to the internet by simply plugging in an ethernet cable from my internet wifi box (LAN output) without changing the network configuration file?

yes

anna If so, does my internet network assign the Bela a different IP address from the default and how would I find this?

it does, but you wouldn't normally have to worry about it: if it's also connected through USB to your computer, you can use the one you've been using so far. In any case, you can use bela.local and it should just work. If this all fails, your home router's configuration page normally has a list of connected devices and their IPs where you can identify the relevant one.

anna

Great, thanks again. For some reason, even though I have plugged the LAN cable from my wifi box into the Bela's corresponding port, I am still not able to connect to the internet..any insights as to why this might be the case?
alt text

anna

I think that I have found the problem: The network sharing center on my local computer indicates that "the network administrator has disabled internet sharing". I am on a home network, so there must be a way that I can change this?

giuliomoro

anna The network sharing center on my local computer indicates that "the network administrator has disabled internet sharing"

I assume this is a Windows message? This would be about trying to share network through your computer, but if you plug Bela into the router directly, then Windows will not know about that. Can you run ip a on the board when the ethernet cable is plugged in? Also, check your router admin page for a list of connected devices.

anna

giuliomoro Able to connect on a different network, so the problem is not related to the Bela! Thanks for your input again!

anna

My router admin page indicates that only my computer is connected to the network...When I run the ip a command on the Bela, the output is the same regardless of whether the ethernet cable is plugged in. I think that there is something wrong with my home network settings...I enabled DHCP as far as I can tell..is there another setting that I should be looking for?