DHCP won't see static devices by definition. The Network Map app shows which devices have connected over time but there is nothing which shows currently connected devices. The nearest you can possibly is to do an nmap scan of you subnet, but obviously the minute you do it, it is potentially out of date. Arpwatch will also track arp requests.

Gateway.Management will show you all the devices that use the gateway or have ever used the gateway.

Nick Howitt wrote:

DHCP won't see static devices by definition. The Network Map app shows which devices have connected over time but there is nothing which shows currently connected devices. The nearest you can possibly is to do an nmap scan of you subnet, but obviously the minute you do it, it is potentially out of date. Arpwatch will also track arp requests.

Thanks for the information, would there be an app that can show that? This also seems to be a common function of many off-the-shelf routers.

Another issue I have today is that, it seems ClearOS could not show DHCP devices connected through a virtual Linux bridge. I am using Proxmox and tried to connect a ubuntu VM to the ClearOS VM by using a virtual switch which is linked to the second NIC (acting as the LAN of my network). My ubuntu VM has no problem connecting to the internet and I can also SSH into it. However, it is not shown as a connected device in the DHCP list.

I am not aware of such a function in off-the-shelf routers unless you are talking about viewing DHCP leases or the arp cache. DHCP leases are not particularly effective. DCHP leases show when a device is not connected and only disappear when the leases expire. They also do not show static devices. The arp cache is more effective. Try just issuing a command "arp -a" from the console.

I've just tried looking at "man arp" and it suggests the command is now obsolete and replaced by "ip neigh"

Is your Ubuntu VM getting its DHCP address from ClearOS or Proxmox?

Nick Howitt wrote:

I am not aware of such a function in off-the-shelf routers unless you are talking about viewing DHCP leases or the arp cache. DHCP leases are not particularly effective. DCHP leases show when a device is not connected and only disappear when the leases expire. They also do not show static devices. The arp cache is more effective. Try just issuing a command "arp -a" from the console.

I've just tried looking at "man arp" and it suggests the command is now obsolete and replaced by "ip neigh"

You are right, I guess I maybe confused. The "static" address in my old Netgear router was assigned after the DHCP lease was issued. So it is not exactly static from the client side.

Is your Ubuntu VM getting its DHCP address from ClearOS or Proxmox?

I am new to virtualizing router so I maybe wrong. I believe the IP is obtained from ClearOS, as virtual switch isn't in NAT mode. In particular, all other devices physically attached to that port can be seen in the DHCP list (except some static devices). For example, another ubuntu serve I have connected through the physical port is shown on the DHCP list, but not the other VM ubuntu server which connect through the virtual switch within Proxmox. But then it seems to have normal network connection.

Does the Ubuntu machine have an IP address in the same range as the ClearOS DHCP server.

I am also not good at virualisation. I use it a bit with Virtual Box and KVM but I am not clear about the different LAN types and I know noting about Proxmox.

Nick Howitt wrote:

Does the Ubuntu machine have an IP address in the same range as the ClearOS DHCP server.

Yes, this is what puzzled me.

I am also not good at virualisation. I use it a bit with Virtual Box and KVM but I am not clear about the different LAN types and I know noting about Proxmox.

No worries, this isn't a really an issue, just a weird observation that I thought I might as well bring up.
It could be something else, I will come back if I found anything.