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How to get my dhcp ip address, whether i am in a local network?

I.e. if we have internet access in local network, but i want to know my dhcp server IP .. like " what is my IP" ..

Surender Chopra
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2 Answers2

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Edit Your question was worded in slightly confusing way. Getting your public IP form terminal can be done with curl https://diagnostic.opendns.com/myip. Open DNS has web service that tells you your IP address, which is pretty much just a web page , with only one text - your IP. Effectively, you are downloading a web page that tells you your IP.

Original

Typically dhcp server is located on the router. Thus , your main goal then is to get address of the router, which in networking terms would be default gateway. Thus , effectively your question can be solved by the multiple solutions as described in my answer here. The simplest method is to use netstat -nr command.

There is another method as well: nmcli dev list | grep -i dhcp_server_identifier (Ubuntu 14.04 and earlier). Sample output for that would be:

$ nmcli dev list | grep -i dhcp_server_identifier                              
DHCP4.OPTION[13]:                       dhcp_server_identifier = 192.168.0.1

With Ubuntu 15.04 the nmcli version is different, hence you have to enter slightly different command:

nmcli dev show | \grep 'gw ='

Side note : grep in my install of 15.04 is aliased to grep --color=auto which prints colorized output. If we want just to see the particular lines, we need to use simple grep, which the forward slash instructs the shell to use.

Community
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Sergiy Kolodyazhnyy
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What is my ip shows you the public IP of your gateway. If this is what you are looking for you wan use:

nslookup myip.opendns.com