Comments on: How to check if you’ve been infected by DNS Changer virus.

By: Linuxios

Linuxios — Sat, 04 Aug 2012 12:54:19 +0000

Great post! Just one little correction. When you say to do ifconfig /all, that's the Windows syntax for command line arguments. To do the equivalent on Linux: ifconfig -a (which displays the data for all network interfaces, down or up).

By: Ilmari Karonen

Ilmari Karonen — Wed, 25 Jul 2012 11:48:47 +0000

What mpiktas wrote goes for Linux too. ifconfig /all is not a valid command, it tries to fetch information about the interface /all and fails. Either ifconfig -a or just ifconfig will work, but won't actually tell you the nameservers. For that, you can either look in /etc/resolv.conf or run something like host -t a -v stackexchange.com and look at the last line, which should look something like this:

Received 51 bytes from 127.0.0.1#53 in 25 ms

(Of course, I'm running a local DNS cache, so in my case the resolver address is just the IP loopback address 127.0.0.1, and I'd have to dig deeper to find the actual nameservers the cache is using. But that's a somewhat nonstandard configuration, albeit quite useful if you ever happen to find yourself on a high-latency Internet connection.)

By: kronos

kronos — Mon, 23 Jul 2012 21:16:06 +0000

@mpiktas I've updated the answer in Super User and here. Thanks for the catch.

By: mpiktas

mpiktas — Mon, 23 Jul 2012 20:27:48 +0000

On Mac OS X 10.6.8 ifconfig /all gave an error. A quick search on internet for how to get DNS settings on Mac does not mention ifconfig. Either cat /etc/resolv.conf, or use networksetup, which also does not work. So how do you check DNS settings for Mac from Terminal?

By: Oguzhan Uysal

Oguzhan Uysal — Mon, 23 Jul 2012 19:56:38 +0000

For my own convenience i always use Level3, which is easy to remember and a well known DNS-Server, but OpenDNS is a helpfull and safe DNS alternative.

Level3: 4.2.2.2 4.2.2.3

OpenDNS: 208.67.222.222 208.67.220.220

OpenDNS has a few handy features (which may have become more, i havent used it recently) which makes surfing the internet safer, blocking access to phising domains and if requested access to specific sites/categories.