The 18.04 server installation process creates /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg, which, in turn, seems to generate /etc/netplan/50-cloud-init.yaml. I can't seem to find exactly how 50-cloud-init.yaml gets generated from 50-curtin-networking.cfg though.
What is the recommended way to manage IP addresses on an 18.04 server? Edit 50-curtin-networking.cfg, and then run some command (?) to update 50-cloud-init.yaml? Or some other process?
I administrate an Ubuntu 11.10 Server. I've installed tightvncserver on it so I can have a desktop environment on the server.
My issue now is, I'm running into issues with malicious people spamming the VNC server with authentication attempts. I've strengthened up the password, but it's still inconvenient as it restricts me from connecting as the person is using up all the authentication attempts.
There are pretty much around 5 IP addresses that should be able to ATTEMPT to authenticate to the VNC server, this person is using proxies from Romania, China, Korea, etc.
How can I accept authentication attempts to ONLY the IP addresses I specify?
Essentially, I want to do the opposite of this: How to deny VNC access to a particular IP?
And this with VNC instead: How can I allow SSH password authentication from only certain IP addresses?
Any ideas?
Thanks, Brandon
My eth0 is using DHCP to get IP address for Internet. However I still need to set some static IP for my LAN. The following is my setting in /etc/network/interface. Any problem on the script ? I always failed when I try to start network.
I checked the IP via ifconfig. and found eth0:3 is set but others. May I know what's the problem?
1 auto lo
2 iface lo inet loopback
3
4 #auto eth0
5 #iface eth0 inet dhcp
6
7 auto eth0:1
8 iface eth0:1 inet static
9 address 192.168.20.222
10 netmask 255.255.255.0
11 gateway 192.168.20.1
12
13 auto eth0:2
14 iface eth0:2 inet static
15 address 192.168.30.222
16 netmask 255.255.255.0
17 gateway 192.168.30.1
18
19 auto eth0:3
20 iface eth0:3 inet static
21 address 192.168.211.222
22 netmask 255.255.255.0
23 gateway 192.168.221.1
I have had a couple of occasions where I was unable to remember the IP address for a given system but was, at the time, able to connect using the hostname. As an example, just now I wanted to set up port forwarding on my router and couldn't remember the IP for the target system.
I am wondering if it is possible to add the system's IP address to the welcome message that gets displayed on an SSH connection.
The default welcome message that I am trying to modify, in case that term is ambiguous, is"
Linux [hostname] 2.6.35-32-generic #64-Ubuntu SMP Tue Jan 3 00:47:07 UTC 2012 x86_64 GNU/Linux
Ubuntu 10.10
Welcome to Ubuntu!
* Documentation: https://help.ubuntu.com/
Somewhere in there I think I'd like to add the IP address of the system I just logged in to. Any suggestions? Other than trading in my brain for a newer model with more RAM?
We have more than 500 machines running Ubuntu. I have noticed that many machines have IP address conflicts. Is it possible to identify IP address conflicts in Ubuntu?