Some very useful networking tricks for Linux/UNIX users.

Posted: August 11, 2014. At: 2:11 PM. This was 3 years ago. Post ID: 7616

Get your gateway IP address with curl on the command line.

[homer@localhost ~]$ echo $(curl -# http://ipecho.net/plain)
######################################################################## 100.0%
153.107.97.164

Another way to list the IP addresses of your network interfaces. Using the ip command.

[homer@localhost ~]$ ip a | grep inet*
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
    inet 192.168.233.138/24 brd 192.168.233.255 scope global dynamic eno16777736
    inet6 fe80::20c:29ff:fed5:77e3/64 scope link

Use the host command to get the FQDN of a host by the querying the IP address.

homer@localhost ~]$ host 8.8.8.8
8.8.8.8.in-addr.arpa domain name pointer google-public-dns-a.google.com.

List all multicast networking addresses for your network interfaces. Using the ipmaddr show command.

[homer@localhost ~]$ ipmaddr show
1:      lo
        inet  224.0.0.1
        inet6 ff02::1
        inet6 ff01::1
2:      eno16777736
        link  01:00:5e:00:00:01
        link  33:33:00:00:00:01
        link  33:33:ff:d5:77:e3
        link  01:00:5e:00:00:fb
        inet  224.0.0.251
        inet  224.0.0.1
        inet6 ff02::1:ffd5:77e3
        inet6 ff02::1
        inet6 ff01::1

Print out network adapter statistics using the ifstat command.

[homer@localhost ~]$ ifstat 
#kernel
Interface        RX Pkts/Rate    TX Pkts/Rate    RX Data/Rate    TX Data/Rate  
                 RX Errs/Drop    TX Errs/Drop    RX Over/Rate    TX Coll/Rate  
lo                     0 0             0 0             0 0             0 0      
                       0 0             0 0             0 0             0 0      
eno16777736           16 0            17 0          2185 0          4077 0      
                       0 0             0 0             0 0             0 0

Get the interface IP address using the ipconfig getifaddr command on Mac OSX.

Admins-iMac-203:~ admin$ ipconfig getifaddr en1
172.29.59.206

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