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Linux find up interfaces

If a Linux box VM, WSL or a physical server is unable to connect to Network, one possible issue is the network interface is not UP.

Typing:
  ip address show
  Or:
  ip a s 

The output will show which interfaces are UP.

If the output shows like: 
eth0: <BROADCAST, MULTICAST, UP, LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

UP after multicast means that the interface is not disabled on the OS or administratively enabled

LOWER_UP means that a cable is connected  and is able and is able to find an active switch port 


Running this command below:
tcpdump -D

The output will also show that the interface is Up, Running and connected.

Example:
1. eth0 [Up, Running, Connected]

Basic commands that will help to save the day if ever there is some network or connectivity issues.

zenity, dialog, can also be used to generate GUI boxes.
However, whiptail still the best for minimal footprint and might come as a default for Server Distros OS.


That's it.. till next time.





Stay close to Jesus, you will find comfort and amazing peace. All you need is to surrender wholeheartedly whatever you're going through.

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