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Emulab FAQ: Testbed Operations: How do I see interface error counts?
Emulab FAQ: Testbed Operations: How do I see interface error counts?
On FreeBSD, "netstat -i" will show if there are errors.
If you want more detail, you can do "sudo sysctl hw.emN.stats=1" where N is the interface number, and stats will get spit out on the console.