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The Linux file /proc/net/dev reads like this:

[me@host ~]$ cat /proc/net/dev Inter-| Receive | Transmit face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed

What do fields drop and errs mean?

Are some errs packets also count in the drop packets?

Why is a packet considered errs , is it because that it suffers from checksum error?

Why is a packet dropped? is it because that the system has no enough buffer of because there is some burst on the NIC?

Do the two fields take packets that are destined to other host (e.g. when the NIC is working in promiscuous mode) into consider?

thanks in advance. Utoah