How to set up a static IP in RB5

Roberto

I would like to set a static IP.
I thought that maybe in UBUNTU you could set it as follows:

sudo vi /etc/dhcpcd.conf

I tried with the WiFi network wlan0 and set an IP compatible with my network: 192.168.178.201

# on the server to actually work
option rapid_commit

# A list of options to request from the DHCP server
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
# Most distributions have NTP support.
option ntp_servers
# Respect the network MTU. This is applied to DHCP routes.
option interface_mtu

# A ServerID is required by RFC2131.
require dhcp_server_identifier

# Generate Stable Private IPv6 Addresses instead of hardware based ones
slaac private

# ==== Test of static IP configuration: ======
interface wlan0
static ip_address=192.168.178.201/24
static routers=192.168.178.1
static domain_name_servers=8.8.8.8

But when I turn RB5 off and on again sometimes it works with right static IP 192.168.178.201 and sometimes with a random IP, I don't know what I did wrong. Could you please help me?
Robert

tom

@Roberto There is a bug with the QCOM SOM where the wlan0 interface's MAC address isn't static, which affects using static IPs in ways that usually work on other hardware. We have an open ticket with QCOM to fix this issue. One thing to try is: https://www.howtogeek.com/118337/stupid-geek-tricks-change-your-ip-address-from-the-command-line-in-linux/

The solution may require creating a custom startup script.

Roberto

@tom Thank you
But perhaps i did something wrong creating a script:

vi /etc/sudoers.d/mystatic-ip.sh

Content of mystatic-ip.sh file:

#!/bin/bash
sudo ifconfig wlan0 192.168.178.201 netmask 255.255.255.0
sudo route add default gw 192.168.178.1 wlan0

Then i created a service:

vi /etc/systemd/system/mystatic-ip.service

Content of mystatic-ip.service file:

[Unit]
Description=My static IP

[Service]
ExecStart=/etc/sudoers.D/mystatic-ip.sh start

[Install]
WantedBy=multi-user.target

To enable this service when startup I did:

systemctl enable mystatic-ip

I don't know what I did wrong. Could you please help me?
Robert

tom

@Roberto When you run the script manually outside of the service file does it work?

Roberto

@tom
Thank you for reply, yes If I run:

sudo ifconfig wlan0 192.168.178.201 netmask 255.255.255.0
sudo route add default gw 192.168.178.1 wlan0

works, but if I restart RB5 the script does not do his work, perhaps a chmod is needed?

Eric Katzfey

@Roberto It's probably a timing thing. Your service file doesn't have any dependencies so it gets run immediately on startup. Then a different service comes along and changes everything. Ideally you specify the service that is doing that as a dependency so you know yours will run after it. Just to debug you could add a big sleep before the commands and see if that solves the issue.

Roberto

@Eric-Katzfey
Thank you for help, what would you suggest? Perhaps a delay in the script or something similar?
how do you suggest to do the startup log? and how could this sequence be organized correctly?
Do you have a RB5 to test? Thank you for any help

tom

@Roberto The "dumb" way to do it is to just put a sleep at the start of mystatic-ip.sh and gradually decrease the length to find the quickest sleep that works.

Otherwise you'd have to reference another service in an "After" section to tell the service to start after the stated one

Example:

[Unit]
Description=My static IP
After=wlan_daemon.service

I know on VOXL wlan_daemon.service can be referenced, not positive whether it is on RB5 as well

Roberto

RESOLVED: Thanks to @Eric-Katzfey & @tom

First create a script:

vi /etc/sudoers.d/mystatic-ip.sh

Content of mystatic-ip.sh script:

#!/bin/bash
sudo ifconfig wlan0 192.168.178.201 netmask 255.255.255.0
sudo route add default gw 192.168.178.1 wlan0

Create a service:

vi /etc/systemd/system/mystatic-ip.service

Content of mystatic-ip.service file (that starts after wlan daemon):

[Unit]
Description=My static IP
After=wlan_daemon.service

[Service]
ExecStart=/etc/sudoers.d/mystatic-ip.sh start

[Install]
WantedBy=multi-user.target

To enable this service when the RB5 boots:

systemctl enable mystatic-ip

Reboot and you will have a static IP!

Roberto

NOT RESOLVED @Eric-Katzfey & @tom

Works on Reboot but not if I turn RB5 OFF wait a wile and afterwards I turn it ON

Sometimes work and sometimes doesn't

Somebody could please help me?

Roberto

@tom & @Eric-Katzfey

List of services: (command to show active services)

systemctl list-units --type=service

Screenshot 2022-03-10 alle 17.56.18.png

Some services are down like:
● dnsmasq.service loaded failed failed dnsmasq - A lightweight DHCP and caching DNS server
● lunch-make-scripts.service loaded failed failed lunch make scripts
● mystatic-ip.service loaded failed failed My static IP

Somebody could please help me?

Eric Katzfey

@Roberto We will take a look and see if we can put together a solution over the next few days.

tom

@Roberto This combo consistently works for me:

sh-4.4# cat /usr/bin/rb5-wifi-static-ip.sh 
#!/bin/bash

# wait for wlan0 to get it's initial IP from router
rb5-net-check wlan0 192.168

# set new IP
sudo ifconfig wlan0 192.168.1.150 netmask 255.255.255.0
sudo route add default gw 192.168.1.1 wlan0

sh-4.4# cat /etc/systemd/system/rb5-wifi-static-ip.service 
[Unit]
Description=WLAN0 Static IP Service
After=wlan_daemon.service

[Service]
ExecStart=/usr/bin/rb5-wifi-static-ip.sh

[Install]
WantedBy=multi-user.target

Basically adding the rb5-net-check call which waits for wlan0 to get an initial valid IP before proceeding.

tom

@Roberto Or a slightly cleaner solution would be to keep your same script and just have the service depend on the rb5-net-check.service that is already enabled by default if you're running PX4:

sh-4.4# cat /etc/systemd/system/rb5-wifi-static-ip.service 
[Unit]
Description=WLAN0 Static IP Service
After=rb5-net-check.service

[Service]
ExecStart=/usr/bin/rb5-wifi-static-ip.sh

[Install]
WantedBy=multi-user.target

Roberto

FINALLY SOLVED: Thanks to @tom
(added chmod and complete procedure for other users)

First create a script:

vi /usr/bin/rb5-wifi-static-ip.sh

Content of rb5-wifi-static-ip.sh script (with sample IP):

#!/bin/bash

rb5_net='192.168'
drone_IP='192.168.178.201'
router_IP='192.168.178.1'
netmask_IP='255.255.255.0'
network_interface='wlan0'

# wait for wlan to get it's initial IP from router
rb5-net-check $network_interface $rb5_net

# set new IP
sudo ifconfig $network_interface $drone_IP netmask $netmask_IP
sudo route add default gw $router_IP $network_interface

Give permission to script (if not, will give you message "Permission denied"):

chmod u+x /usr/bin/rb5-wifi-static-ip.sh

Create a service:

vi /etc/systemd/system/rb5-wifi-static-ip.service

Content of rb5-wifi-static-ip.service file:

[Unit]
Description=WLAN0 Static IP Service
After=wlan_daemon.service

[Service]
ExecStart=/usr/bin/rb5-wifi-static-ip.sh

[Install]
WantedBy=multi-user.target

Enable this service when RB5 boots:

systemctl enable rb5-wifi-static-ip.service

Restart RB5 and you will have a static IP!

tom

@Roberto Thanks for your patience with this, I will make sure this script / service makes it into our next SDK release as well.

mrawding

If anyone else is interested - I found a way to enable static ip's for ethernet and wlan interfaces.

You'll need to install a file like below under /etc/systemd/systetem/ and run the following commands:

systemctl enable ipconfig.service
systemctl disable dhcpcd.service

[Unit]
Description=A description for your custom service goes here
Requires=systemd-networkd.service
After=systemd-networkd-wait-online.service

[Service]
Type=simple
ExecStartPre=/bin/sleep 10
ExecStart=/bin/systemctl restart systemd-networkd.service


[Install]
WantedBy=multi-user.target

You'll also need to add this file under /etc/systemd/network/wlan0.network

[Match]
Name=wlan0

[Network]
Address=192.168.0.169/24
#DHCP=yes

Simply installing this service will allow most routers to keep the rb5 address the same when assigning IPs for a lease. Just comment #Address and uncomment DHCP to use dhcp.

You will also need to make sure to add the gatway to the routing table:

route add default gw $router_IP $network_interface

this is best to be configured as a oneshot service where the service has the field Requires=ipconfig.service