This article explains several different methods of determining the public and private IP Addresses of a Linux system. Private IP addresses are not routable over the Internet and are meant to work within the local network only. Usually, the private IP addresses are assigned to each device inside your local network by your router. This provides a unique IP address for devices that are within your local network, such as your phone, laptop, smart TV, printer, media center, and so on.
Find DHCP Server IP Address on Linux Command Line
Devices on the local network are connecting to the Internet through NAT network address translation. The following IPv4 address ranges are reserved for the private networks:. You can determine your system private IP address by querying the network stack with commands such as ip , ifconfig or hostname. In Linux, the standard tool for displaying and configuring network interfaces is ip. To display a list of all network interfaces and the associated IP address type the following command:.
Checking your IP Address in Ubuntu [Terminal Method]
I ran a traceroute on three of the addresses and two are from China and the other is from Pakistan; these are the IPs:. Hackers edit crontab to execute 7 executables that will, every x amount of time, use up all the CPU, max the servers network output, then simply die. Also they add the readme to crontab times to hide the added lines, so when you do crontab -l you will be spammed by the readme with hidden lines.
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As you can see, all the log files are cleared, this is why I was not able to retrieve a lot of information. It brought down the entire server all the VMs causing timeouts on the sites and on proxmox. Here is a graph the spikes denote the botnet actively DDoS'ing and notice the network out :. As a result I will be adding the entire range of Chinese IP addresses to a firewall to block all the connections I don't have any Chinese users so I don't care , I will also disallow remote root logins and use long complex passwords. I will also most likely change the ssh port and use private ssh keys as well.
How to Find Your IP Address in Linux
From this answer, I see the below information. Track user logins and logouts. Track activity of those users : If they are somewhat innocent, you can check the file. You will see a list of the commands that they executed. The problem is of course that they can delete or edit this file. Prevent users from deleting logs : Users shouldn't be able to touch auth.
What if the user manages to obtain root access? Unless he makes a mistake he will be able to hide all his footsteps.
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Also from this answer, I see that ssh history could be stored in these files. See wiki for detailed description. You can't edit the files with normal editors, but could erase them. This machine has been compromised. This means any data on it, historical or current, can no longer be trusted.
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In short, the answer is no. You cannot be sure you have found the originating address from any log file recorded on this machine. Home Questions Tags Users Unanswered. Running this command reveals a whole list of numbers.
Which one should we use? The inet addr? Robert Swisher Robert Swisher 1, 7 7 silver badges 12 12 bronze badges.
You can make that shorter by just running ip a. Or, just plonk that URL into your browser. Kyle, Which can be added Similar to this, there is also curl ifconfig. James James 6 6 silver badges 14 14 bronze badges. In this case I would suggest using hostname --all-ip-addresses. Display all network addresses of the host. This option enumerates all configured addresses on all network interfaces. The loopback interface and IPv6 link-local addresses are omitted.
Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.
Thanks hanxue - this ought to be an answer of it's own - the shortest command with the cleanest output - just what I was looking for! Johan Johan 91 2 2 bronze badges.
Hurray for one-liners! Polfer Feb 26 '10 at Thanks, it works on Debian but on OS X it doesn't work, returning some garbage. It would be great if we could come of with a line that works on both. Here is the output of ifconfig on OS X: gist. JakeRobinson JakeRobinson 2, 14 14 silver badges 25 25 bronze badges.
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