Raspberry Pi Forums

Log into your Pi via SSH or open up a terminal in its GUI and pull up your network interfaces.

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sudo nano /etc/network/interfaces

Paste the following onto the bottom of the file, then save and exit (ctrl-X, Y):

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iface usb0 inet static
address 192.168.42.42
netmask 255.255.255.0
network 192.168.42.0
broadcast 192.168.42.255

Please note that this file is written to be used with dhcpcd. For static IP, consult /etc/dhcpcd.conf and "man dhcpcd.conf."

"static value" Configures a static value. If you set ip_address then dhcpcd will not attempt to obtain a lease and just use the value for the address with an infinite lease time. If you set ip6_address, dhcpcd will continue auto-configuration as normal. Here is an example which configures two static address [sic], overriding the default IPv4 broadcast address...
static ip_address=192.168.0.10/24...

sonettguy wrote: ↑

Thu Sep 26, 2019 8:30 pm

I would like to use my Android Galaxy Tab A tablet as a monitor for my pi 4 running Buster. I found the following article on setting it up on an earlier device. https://joshuawoehlke.com/android-raspb ... -over-usb/. One of the steps is the following.

Log into your Pi via SSH or open up a terminal in its GUI and pull up your network interfaces.

Code: Select all

sudo nano /etc/network/interfaces

Paste the following onto the bottom of the file, then save and exit (ctrl-X, Y):

Code: Select all

iface usb0 inet static
address 192.168.42.42
netmask 255.255.255.0
network 192.168.42.0
broadcast 192.168.42.255

But the interfaces file says:

Please note that this file is written to be used with dhcpcd. For static IP, consult /etc/dhcpcd.conf and "man dhcpcd.conf."

I'm instantly over my head. I'm concerned that I will screw things up so I'd like a little advice here. I think I am setting up a static address for the USB tether. The manual has about 400 options. One is

"static value" Configures a static value. If you set ip_address then dhcpcd will not attempt to obtain a lease and just use the value for the address with an infinite lease time. If you set ip6_address, dhcpcd will continue auto-configuration as normal. Here is an example which configures two static address [sic], overriding the default IPv4 broadcast address...
static ip_address=192.168.0.10/24...

Is that what I should do, add in this case "static ip_address=192.168.42.42" in dhcpcd.conf instead of adding text to the interfaces file?

Second, I can't find an enable USB tethering switch in settings of the Tab A. Does this mean that I can't use this device?

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VNC connection failed! Non route to host

sonettguy wrote: ↑

Thu Sep 26, 2019 11:20 pm

Thanks for the quick replies! It is awesome to get some feedback so quickly. I appreciate it. Also, thanks, neilgl, for your first comment. That is exactly what I thought I would do. But, the enable/disable buttons on USB tethering are greyed-out on my Android tablet. I don't have a data plan for the tablet (nor do I want one), so the hot-spot is not good. I want a USB tethered cord. Seems like it should be possible, but if I simply try to connect (I'm using androidVNC) to 192.168.42.42, I get

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VNC connection failed! Non route to host

sonettguy wrote: ↑

Sun Sep 29, 2019 10:33 pm

Well, that was a complete disaster. I followed the instructions in the link https://www.raspberrypi.org/documentati ... et-sharing and could not get the network SSID to show up on my tablet. Trying a second time, I get the following error.

Then, I had to undo all the work to get the internet back on the pi just to send this. There are no instruction on undoing it. Very frustrating.

I really don't even want to be doing this. I want a USB tether to the tablet for the desktop and still be able to get on the internet if one is available, or go on without it if it is not.

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sudo systemctl start hostapd

~ $ journalctl -xe
Sep 29 16:30:48 pi08 hostapd[2030]: Failed to initialize interface
Sep 29 16:30:48 pi08 systemd[1]: hostapd.service: Control process exited, code=e
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit hostapd.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 29 16:30:48 pi08 systemd[1]: hostapd.service: Failed with result 'exit-code'
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit hostapd.service has entered the 'failed' state with result 'exit-cod
Sep 29 16:30:48 pi08 systemd[1]: Failed to start Advanced IEEE 802.11 AP and IEE
-- Subject: A start job for unit hostapd.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit hostapd.service has finished with a failure.
--
-- The job identifier is 5145 and the job result is failed.
lines 3836-3858/3858 (END)
Sep 29 16:30:48 pi08 hostapd[2030]: Failed to initialize interface
Sep 29 16:30:48 pi08 systemd[1]: hostapd.service: Control process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit hostapd.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 29 16:30:48 pi08 systemd[1]: hostapd.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit hostapd.service has entered the 'failed' state with result 'exit-code'.
Sep 29 16:30:48 pi08 systemd[1]: Failed to start Advanced IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP Authenticator.
-- Subject: A start job for unit hostapd.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit hostapd.service has finished with a failure.
--
-- The job identifier is 5145 and the job result is failed.

I'm going to assume that using the tablet as a monitor is not possible with Buster and go on unless someone else has an idea.