Linux – How to find out which server OS a particular site is running

internetlinux

Is there a way to check which server OS a particular site is running. For example from linux command line. Maybe via telnet? But all I can get from "telnet www.google.com http" is:

Trying 209.85.173.104...
Connected to www.l.google.com.
Escape character is '^]'.

Can somebody dwell on the subject if possible at all?

Best Answer

You can look for OS fingerprinting functionality built into NMap.

However, if you're looking for something like "What is Google running?" you won't get far since you won't know what's behind their load balancers, or firewalls will block it, and fingerprinting can only be so accurate so you can get false reports back and you may not get anywhere when the connection is somehow NAT'ed.

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Linux – How to find connected hosts at network (vpn or lan)

OpenVPN comes with a management interface that can provide some useful information. Please see http://openvpn.net/index.php/open-source/documentation/miscellaneous/79-management-interface.html
It requires some changes to your OpenVPN configuration file: You can activate the management interface by adding these lines


management 192.168.0.100 5555 /etc/openvpn/password

Change the address 192.168.0.100 by the OpenVPN default address and 5555 by any unused port, setup a file (e.g /etc/openvpn/password) that will contain the management interface password. Later do a telnet to target like this:


telnet 192.168.0.100 5555

Furthermore, you can also manage who is connected to your OpenVPN server using a python script, please take a look at ovpnview

Linux Bash – How to Sort du -h Output by Size

As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:

du -hs * | sort -h

If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:

brew install coreutils
du -hs * | gsort -h

From sort manual:

-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)

Best Answer

Related Solutions

Linux – How to find connected hosts at network (vpn or lan)

Linux Bash – How to Sort du -h Output by Size

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