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I am running Buster amd64 with XFCE desktop. I know that I can change the DNS server by editing connections in the network icon. What I am wanting to know is this; can I get the system to use the new DNS server settings without having to reboot the computer? I tried to do it by issuing
to get the changes to take effect without rebooting. Of course one needs to use the correct interface for their system. In my case, instead of eth0 I would use enp2s0.
I would welcome comments, especially if my research was flawed.
Last edited by ticojohn on 2021-04-18 18:35, edited 1 time in total.
I am not irrational, I'm just quantum probabilistic.
Assuming that your "editing connections in the network icons" ends up modifying /etc/resolv.conf, then the effect should be immediate, so there's no need to disconnect-reconnect, reboot, or anything.
Most programs use the standard glibc resolver, so the effect is immediate. Maybe Chrome, Firefox, etc. might try to be too "smart" and require restarting (the program, not the computer).
Also keep in mind that if you're using dhcp, the dns information comes with that protocol from the dhcp server (in most cases your router). So editing it won't work, since the dhcp-system will override it. In that case, edit the dns information in your router webconfig.
Also worth noting: if you reside in the VS, the Firefox browser uses an encrypted dns-over-https protocol to anonymize your dns requests for your provider and other peeping toms. So changing your dns wouldn't affect your Firefox browser since it doesn't use your dns. If you don't want that, you would need to change the appropriate settings in Firefox's about-config.
Bloom wrote:Also keep in mind that if you're using dhcp, the dns information comes with that protocol from the dhcp server (in most cases your router). So editing it won't work, since the dhcp-system will override it. In that case, edit the dns information in your router webconfig.
Thanks @Bloom. To get it to work one needs to change the configuration from Automatic(DHCP) to Automatic (DHCP) addresses only.
Also, I found that ifdown eth0 doesn't work for me. Don't know why not. Probably some network config setting. However ifconfig eth0 down does work.
I am not irrational, I'm just quantum probabilistic.
ticojohn wrote:
Also, I found that ifdown eth0 doesn't work for me. Don't know why not. Probably some network config setting. However ifconfig eth0 down does work.
ifup and ifdown are part of the ifupdown package, which you probably don't have/use, as you seem to be using NetworkManager.
ifconfig is part of net-tools, which is commonly installed (but nowadays it's not considered essential anymore).
ip (/usr/sbin/ip) is the modern replacement of ifconfig, and is part of the iproute2 package, which is installed by default, so instead of "ifconfig eth0 down" you'd do "ip link set eth0 down", etc.
reinob wrote:
ifup and ifdown are part of the ifupdown package, which you probably don't have/use, as you seem to be using NetworkManager.
ifconfig is part of net-tools, which is commonly installed (but nowadays it's not considered essential anymore).
ip (/usr/sbin/ip) is the modern replacement of ifconfig, and is part of the iproute2 package, which is installed by default, so instead of "ifconfig eth0 down" you'd do "ip link set eth0 down", etc.
Thanks for that feedback @reinob. Good to know. I'll mark this post as [SOLVED].
I am not irrational, I'm just quantum probabilistic.
