I have network-manager installed to replace the utilization of /etc/networking, which is the default interface to configure networks.
However, I was reading this guide on modifying the sysctl.conf file and have added many additional lines for TCP/IP tweaks and recommended settings. I’m uncertain if the settings will impact the network-manager or only reach to /etc/network.
Then I was testing out the settings and discovered that I cannot ping to an external network.
Why is the settings not working?