A way to see all connected devices?

  • ATTENTION! As of November 1, 2020, you are not able to reply to threads 6 months after the thread is opened if there are more than 500 posts in the thread.
    Threads will not be locked, so posts may still be edited by their authors.
    Just start a new thread on the topic to post if you get an error message when trying to reply to a thread.

Jorabi

New Around Here
I plugged an unknown device (it's default ip is NOT on the same subnet as all the other devices) into the back of an RT-AC87R. Activity lights come on the router and the device. I was hoping to see it appear as a mac address at least, but nothing changes in the client list. I tried the same test with another device (a camera), it didn't appear either.

Does anyone know a way to see ALL wired Ethernet devices plugged into the router regardless of what they are, or a 3rd party tool to find all connected mac addresses? I looked at nmap but it is way too complicated.
 

ColinTaylor

Part of the Furniture
Probably the most reliable way would be to SSH into the router and issue an arp -an command.
 

drabisan

Very Senior Member
If unknown device doesn't have an ip address from the same subnet (like static ip, out of the subnet), arp -na will not help.
You want to learn the mac address of that device? I'm not aware of any ways to query the mac address of the physical ports. There may be one, but it may be platform dependent.
 

Jorabi

New Around Here
Thanks, I didn't know the router had SSH. I did the arp -an command and got a list of all connections, but none of the unknown devices showed up (I know all of their mac addresses). Strange. If you're wondering why I'm doing this, I cannot reach the first unknown device and I'm trying to determine if it's beyond help. It's a Ubiquiti access point. All the lights work correctly but I can't reach it using all known methods.
 

ColinTaylor

Part of the Furniture
If unknown device doesn't have an ip address from the same subnet (like static ip, out of the subnet), arp -na will not help.
I tested this before posting, it does work. Of course this does assume that the client is trying to send out some traffic. If it's completely inert arp won't help.
 

Similar threads

Latest threads

Sign Up For SNBForums Daily Digest

Get an update of what's new every day delivered to your mailbox. Sign up here!
Top