netstat interface output

[Doug Hardie]

> On 24 February 2017, at 20:43, Adam Vande More <amvandemore at gmail.com> wrote:
> 
> On Wed, Feb 22, 2017 at 5:38 PM, Doug Hardie <bc979 at lafn.org> 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:
> 
> https://www.freebsd.org/doc/handbook/config-network-setup.html

Thats how the static IPs are configured.  They work fine after a reboot.  However, after awhile those addresses disappear.  Therein lies the problem.

— Doug