Surfing on my network?

[braveheart89]

How can you determine whether or not someone else is surfing on your network? Is there a way?

[BrowserXL]

If you have a router that has a mac address filter you can only allow certain mac addresses that are allowed to access the LAN. That way you can prohibit strangers from using your lan in a simple way. If your router not only blocks access from unauthorized macs but protocols the tries to gain access you will know for sure. Depending on the router model you can apply such filters to wired or wireless lan segments.
This is only a very basic implementation but one that every half way up to date router should be able to provide. Apart from that there are other ways, but with increasing complexity.

[TheForumTroll]

With "on your network" do you mean using your internet connection or access your local LAN? If it is your internet connection then many routers have the ability to list connected clients and block them like BrowserXL wrote. If it is on a local network it's a bit more complicated.

[DrHu]

There are several Linux shell commands available
http://www.cyberciti.biz/faq/unix-linux ... -in-users/
--to check status of users, logged in..

Code: Select all

last

http://linux.die.net/man/1/last
--another command to see the last users logged in, will also include yourself..

[TheForumTroll]

There are several Linux shell commands available
http://www.cyberciti.biz/faq/unix-linux ... -in-users/
--to check status of users, logged in..

Code: Select all

last

--another command to see the last user logged in, may be yourself..

How does it know what users are logged in on other systems?

[DrHu]

I assumed you would be the admin user on all systems: if not then you also have to be the admin user on the router (assuming it is password protected) to see that data

• If you were the admin user on the system(s), the the various UNIX/Linux commands will get the data for you..

http://www.dba-oracle.com/linux/logged_in_user_info.htm

• The who command does tell us where the user has connected from which may be useful. It may show an IP address as above or a hostname

http://linux.die.net/man/1/who
http://linux.die.net/man/1/rusers
--remote (network) users rwho..(link from above link ref(s) at bottom of file..)

[TheForumTroll]

Did you read the post?

[braveheart89]

Lol. Yes, I read it. It has been a bit hectic. Thank you for your answers.

To be precise, it is the internetconnection of my father. A mobile internetconnection. I will check it out with the answers you have given me.

Thank you again.

[TheForumTroll]

Lol. Yes, I read it. It has been a bit hectic. Thank you for your answers.

To be precise, it is the internetconnection of my father. A mobile internetconnection. I will check it out with the answers you have given me.

Thank you again.

Sorry, I meant if DrHu read your post. It seemed as if he didn't

You just take your time.