What is the command used to check the network connectivity ( not physical link)

jayson_paul · 07-25-2017, 05:28 AM

c program to check whether the network is through Wifi or through Ethernet and to check the status of the network.

for status example

If mobile hot spot is used, you need to turn on the mobile data else you will be connected to wifi but you cannot access the INTERNET.

how to check the connectivity ???

thanks in advance

hazel · 07-25-2017, 06:14 AM

I always check by pinging 8.8.8.8. That's one of the Google nameservers. If you can ping it, you're connected. And unlike some other methods, it doesn't rely on having working dns.

Shadow_7 · 07-25-2017, 06:45 AM

You can only have ONE default route.

# route -n
$ netstat -r

$ ip link show
$ ip addr show
$ ip route show

# ifconfig -a
# ifconfig

Mostly I just ping 8.8.8.8, and if I know my routers IP, I ping it first to make sure it's not my LAN that's being quirky. Otherwise traceroute can help ID which interface is "next" in your route based on it's "IP".

erik2282 · 07-25-2017, 03:06 PM

ip command will show you what interfaces have what IP, maybe not what you're looking for though...

AwesomeMachine · 07-25-2017, 08:22 PM

Hi jayson_paul,

Welcome to LQ!

You can use nmap to map the network.

frankbell · 07-25-2017, 09:03 PM

traceroute will tell you the network path to a target. If you have trouble connecting, it can help you spot where the connection is failing.

For example, if you have connectivity within your LAN, but can't get past your router to the Big Wide World, it may be that your modem needs rebooting or replacement. (This happened to me.)