How my device can get the list of IP address of devices in the LAN.

ADhul.1 · ‎2020-12-20

I read about ARP protocol but it needs IP address to get MAC. How i will know the IP address of neighboring devices to establish communication. We are using router for dynamic address.

Tesla DeLorean · ‎2020-12-21

Send broadcast messages?

Snoop local traffic?

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ADhul.1 · ‎2020-12-21

It is an IOT device with TCP/IP port. Once this added to the network I should be able to find out about the new device and establish the communication. I don’t have the prior info of Ip address to do that.

Jack Peacock_2 · ‎2020-12-21

Providing no gateway is used look at using Reverse ARP to periodically advertise the IP address associated with the MAC. The IOT device originates the broadcast message. Many early 10/100 switches required Reverse ARP to auto-negotiate 10Mbit modes, where the IOT device must provide an initial message to configure the switch.

If you are using a gateway and DHCP to assign a random IP address then you will also need a DNS which is updated by the DHCP server.

Jack Peacock

ADhul.1 · ‎2020-12-21

We use DHCP so I can get a dynamic IP for the new device. But for the devices who are already in the network how will they know about the IP address of this.