Instead of tailing /var/log/messages or doing a continuous ping is there a way with ifconfig or ethtool to track dropped packets, collisions, or tx/rx errors in real time?
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If you just need metrics you can use collectd to monitor and periodically report back the interface's error/collision counters. That's for measuring from the actual host. If you want to monitor reachability from another host collectd can also do a continuous ping and report packet loss. – Feb 10 '15 at 23:11
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I would use wrieshark as a gui or via the command line and have it run in ring-mode. – Feb 10 '15 at 22:28
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Can tcpdump be configured to do this? I can't install collectd but I do have tcp dump. I'd like to monitor the interface but only log things likes errors, collisions and dropped packets. The send that to stdout. – user53029 Feb 11 '15 at 13:54