Network troubleshoot command in Linux

Some useful network troubleshoot command in Linux

( 1 )   ifconfig                                                                                                                                            

        This is standard network interface show command in all Linux flavor. From this we can verify interface status, mode, MAC address, but this will show only physical interface details

( 2 )   ifconfig -a                                                                                                                                        
       
        This is work same as above ifconfig command but only difference is that it show all interface including logical

In some cases Ifconfig command not work then also we can troubleshoot network using below mention commands.

( 3 )  ip addr show                                                                                                                                     

        To view the details of the network interface card such as IP address, Link status, Mac address.

 ( 4 )  ip link                                                                                                                                             
    
        Used for port status to check it is UP or Down.


( 5 )  ip link -s link                                                                                                                                    

        To view network interface status as well as Upload and Download traffic on interface in Rx and Tx.