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How to know uptime ,downtime with timestamps of all connections of ifconfig. For my case they are three eth0,wlan0 and ppp0.

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Some of the information you are requesting can be gleaned from /var/log/syslog, e.g:

grep wlan /var/log/syslog

But the usefulness of that information also depends on how you are network connecting; dhcp or static network connections, etc.

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