Debian/Kali – Problem with writing to /etc/resolv.conf

Question

I want to connect to a public DNS Server (in this case Google's) by modifying the /etc/resolv.conf (which is automatically generated by NetworkManager). If I edit the content of the file via gedit /etc/resolv.conf to

nameserver 8.8.8.8
nameserver 8.8.4.4

(which are the IPs of Google's public DNS server), everything works fine and I do not even have DNS leaks, but if I run my Script:

#!/bin/sh
echo "nameserver 8.8.8.8" > /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

It does not work and I have no Internet-Connection at all.

Solution

If your /etc/resolv.conf is autogenerated by NetworkManager, it will be overwritten at many network events like DHCP-Requests. This is done by the resolvconf package. See man resolvconf (head and tail files) for persistent change of the resolv.conf.

Comments

[EvenDance]

There is no error message, the script changes the resolv.conf like I want to the same thing I do via gedit, I just do not have an internet connection afterwards...:(

[Vafa]

Could you please post the output of following commands : ifconfig -a and netstat -rn

[Anthony Geoghegan]

It would be useful to edit your question to show the result of cat /etc/resolv.conf when it's working before you run your script and after your script has run (when it's broken).

[roaima]

When you "have no Internet Connection" do you really mean that? What is then the result of running ping -c4 8.8.8.8? If you get no result please post the output of netstat -rn. But add these answers to your question; do not put them here in comments.