netstat interface output

Adam Vande More amvandemore at
Sat Feb 25 04:43:22 UTC 2017

On Wed, Feb 22, 2017 at 5:38 PM, Doug Hardie <bc979 at> wrote:

> I am starting to develop a nagios check for errors on interfaces.
> However, there are some issues with the entries in netstat that I don't
> understand.  Each interface has multiple entries:  one for each address and
> one for the link.  It would seem to me that the link counts would be the
> sum of the other address entries, but it is not.  Often it is way off.  At
> first I thought it was possibly caused by overflows of the counters since
> most systems have been running for months.  However, checking one system
> that was only up for one day, the ip4 count was considerably larger than
> the link count.  This is shown in one of the examples below.

This is layer 2 vs layer 3 info.

To set static IP info see:


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