How can I understand if linux server is connected to the internet?
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Yeah ping is a better way to know if you are connected to internet. But if are unable to ping then there could be issue with name server as well.
Elinks is a web browser for command line. You can use it to open a page that you want and if you can see the page you are connected else not.
BUT your name server be running else you will need to know ip addresses.
linuxlover.chaitanya, I looked for elinks but i couldn't find the executable. How can i understand if it is installed in my linux?
By the way, i forgot to mention in my previous post, i can not also ping the other computers using their ips. Especially, they are some machines (in the network) i can not ping but i am certain they are connected to the network (because i can ping them from another computer. I understood that the connection problem exists between this linux machine and some other machines on the network. And i am pretty sure it is because of a configuration problem of the linux machine. Because i can reach these other machines from other computers)
I understood that this linux server is not successfully included by the windows active directory.
Now,, i am searching how to configure kerberos5, winbind, samba to solve this problem. (tough issues for a new bie...)
Can you suggest good articles for making these configurations? ( I already got samba-3 by examples, official & unofficial samba tutorials but i can not be sure how i can make a good start.)
İ made some changes, but after in these configuration files, now i can get the users of the windows active directory by using wbinfo -u & wbinfo -g but when i use "getent passwd" i see that active directory users are not defined in linux local credentials...
So there is some issues with the tcp settings of your Linux box rather than anything else. Most of the systems as you say are in the network. This can also be due to removed cable?
Else check the tcp settings and if your machine does not have a valid ip address provide with it.
If you want to connect to your existing windows active directory domain, you can directly install LikeWise package and join the domain. No hassles. It is available in Ubuntu repositories.