newbie unable to reach the internet

[splash131]

I have a rockpro64 with 4Gb 
I am running aarch64 
Containers aarch64 (DockerCE & Kubernetes) [microSD / eMMC Boot] [0.7.9]
The system boots and I can see form "ip a" command shows lo:, eth0: and docker0:
however, when I run ifdown  eth0 i get unknown interface eth0 
and so far I have been unsuccessful to reach the internet with ping or connect to the gateway my home router.

[evilbunny]

I have a rockpro64 with 4Gb 
I am running aarch64 
Containers aarch64 (DockerCE & Kubernetes) [microSD / eMMC Boot] [0.7.9]
The system boots and I can see form "ip a" command shows lo:, eth0: and docker0:
however, when I run ifdown  eth0 i get unknown interface eth0 
and so far I have been unsuccessful to reach the internet with ping or connect to the gateway my home router.

You can only use ifup/ifdown if there is a corresponding entry in /etc/network/interfaces

A simpler way to go is to use nmtui to configure the interface...

[LMM]

Hi,
   netplan is sometimes used instead of ifupdown : /etc/netplan/eth0.yaml or <networkInterface>.yaml
   you can use ifconfig to check the network 
LMM.

[splash131]

Not sure how to close this but I got it working and connecting to the internet
I have an erro mesh network so it creates another network separate from my home router. I was not connected until I plugged into the eero. Now if I could learn how to get the WiFi component working ....
 If I wanted to use the home router I would have needed to use a different gateway address
Thanks everyone for your help!
This is closed