Need some help regarding security run output

[OBRI]

Since a few days I get the following messages in the daily security run output.
The messages are every day a few more or less. So I copied an example in here:

Code:

freenas.local kernel log messages:

tap0: Ethernet address: 00:bd:8c:d4:68:00
igb0: link state changed to DOWN
bridge0: link state changed to DOWN
tap0: promiscuous mode enabled
tap0: link state changed to UP
bridge0: link state changed to UP
igb0: link state changed to UP
igb0: link state changed to DOWN
tap0: Ethernet address: 00:bd:79:28:72:00
tap0: promiscuous mode enabled
bridge0: link state changed to DOWN
tap0: link state changed to UP
bridge0: link state changed to UP
igb0: link state changed to UP
tap0: link state changed to DOWN
igb0: link state changed to DOWN
tap0: Ethernet address: 00:bd:0e:d6:79:00
tap0: promiscuous mode enabled
bridge0: link state changed to DOWN
tap0: link state changed to UP
bridge0: link state changed to UP
igb0: link state changed to UP
tap0: link state changed to DOWN
igb0: link state changed to DOWN
tap0: Ethernet address: 00:bd:c3:a8:86:00
tap0: promiscuous mode enabled
bridge0: link state changed to DOWN
tap0: link state changed to UP
bridge0: link state changed to UP
igb0: link state changed to UP
tap0: link state changed to DOWN
igb0: link state changed to DOWN
igb0: link state changed to UP
tap0: Ethernet address: 00:bd:a3:a1:ab:00
igb0: link state changed to DOWN
bridge0: link state changed to DOWN
tap0: promiscuous mode enabled
tap0: link state changed to UP
bridge0: link state changed to UP
igb0: link state changed to UP
tap0: link state changed to DOWN
igb0: link state changed to DOWN
igb0: link state changed to UP

Im not sure, what that means and how I can fix it

• igb0: link state changed to DOWN
  --> Does that mean, that the igb0 interface is shut down, or does it loose the connection like when the cable is plugged out?
  
• tap0: Ethernet address: 00:bd:8c:d4:68:00
  --> What is tap0 ?
  --> Why does it have different adresses over the time?
  
• tap0: promiscuous mode enabled
  --> ?
• bridge0: link state changed to UP
  --> what is this "bridge0"?

My System is:

• FreeNAS-11.1-RELEASE
  
• Supermicro X11SSL-F
• 16 GB of Samsung RAM
• 2* 2TB WD Red
• Fractal Design Define Mini
• bequiet Straight Power 10
• Core i3 6100

I`m not sure where to search the problem, because I`m not sure, what exactly the messages mean.

If someone can give me a hint, thanks for that!

Greetings from Germany

obri

 

[Jailer]

--> Does that mean, that the igb0 interface is shut down, or does it loose the connection like when the cable is plugged out?

Looks that way. You're losing connection for some reason.

--> What is tap0 ?

https://www.freebsd.org/cgi/man.cgi?query=tap&sektion=4

--> what is this "bridge0"?

https://www.freebsd.org/doc/handbook/network-bridging.html
https://www.freebsd.org/cgi/man.cgi?bridge(4)