Why can I not ping to external networks?

Zhong Jiang November 22, 2012
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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?

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