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I get one wi-fi  router which is connecting  between my phone line provided by ISP company and my linux server. The operation is fine.

On my linux server, using ifconfig -a command, and it will report
my LAN address such as 192.168.0.107..

Question-1
==========
Could I  use script/command/programming on linux  to get the ISP's IP which connected to my router from my linux system ? Or can I  do it on setup of router setup from
browsering 192.168.0.1 with admin login and password in order to broadcast the  ISP'IP to other LAN servers like mine, but I didn't find anything in the router setup page for such IP address broadcasting

Also I try the port forwarding on router setup to forward 192.168.0.1 router setup page
to other web user in order to collect ISP's IP on web browser or server, but It is
NOT  allowed for port forwarding to setup page, other LAN port forwarding is allowed.

Hope you understand my question

ISP' S IP( 212.3.145.???)---->( through phone-line)----->Wi-FI router----->LAN's IP (192.168.0.107)  for my linux server  


Please advise

Duncan

As Patricksr1972, using whatismyip will show the current ISP assigned public IP.

If your intention is to access an internal server from outside, we can setup DDNS.

In order to get the ISP adress couldnt you simply browse to www.whatismyip.org ?