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Registries
Networking
Networking is the bane of my life. This page is a repository
for all the magic tricks I have found.
No connectivity to other machines on the local network?
For some reason, the IP address of the local machine keeps
disappearing from the hardware network configuration.
Open ifconfig as root, and type ifconfig
<device> <IP address> where <device>
is the device name (the leading name in each ifconfig
paragraph), and <IP address> is the missing IP address.
Fixing a missing route to the outside world
ip route add default via 10.0.0.101
This seems to work, although I have little idea why.
default means anything that is not in the 10.0.0.x
world, and the gateway is via the device at 10.0.0.101
(See also
This Useful Page)
Nameservers
To check what nameservers the current Ubuntu system is using,
enter (as root) cat /etc/resolv.conf
What MetaAI says about my problems
I asked meta AI the following question: How do I fix the
networking on my Ubuntu computer?. Here's what she said:
Fixing networking issues on Ubuntu can be a bit of a challenge,
but don't worry, I'm here to help! Let's go through some steps
to troubleshoot and potentially fix the issue.
-
Check network manager status: Open a terminal and run sudo
service network-manager status to see if the network manager
is running. If it's not, try starting it with sudo service
network-manager start.
-
Check network interfaces: Run ip a to list all network
interfaces. Look for the interface that corresponds to your
network adapter (e.g., eth0, wlan0). Make sure it's up and
running.
-
Check IP address and DNS: Run ip addr show and ip
link show to verify your IP address and DNS settings.
-
Check network configuration files: Inspect the contents of
/etc/network/interfaces and /etc/netplan/*.yaml
(depending on your Ubuntu version) to ensure correct
configuration.
-
Restart network services: Run sudo service networking
restart and sudo service network-manager restart to
restart network services.
-
Check for driver issues: Run lspci -k to list network
adapters and their drivers. If you see any issues, try
updating drivers or reinstalling them.
-
Check firewall settings: Run sudo ufw status to check
if the firewall is enabled. If it is, try disabling it
temporarily with sudo ufw disable.
-
Check for IP conflicts: Run arp -a to check for IP
address conflicts on your network.
-
Try a network reset: Run sudo ip link set eth0 down
(replace eth0 with your interface name) and then sudo ip
link set eth0 up to reset the network interface.
-
Reinstall network manager: If all else fails, try reinstalling
the network manager with sudo apt purge network-manager
and then sudo apt install network-manager.
If none of these steps resolve the issue, please provide more
details about your problem, such as:
- Your Ubuntu version
- The type of network adapter you're using (wired or wireless)
- Any error messages you've encountered
- Your network configuration (e.g., static IP, DHCP)
This will help me better assist you in troubleshooting the issue!
Document History
Document History
(20240427:155814)
| ajh |
0.0 |
first version |
(20240427:174153)
| ajh |
0.0.1 |
add MetaAI commentary |
