How to find the IP address of Raspberry Pi when it is connected to the wireless network without a screen

Assuming you are a linuxer , we don't want to assume you are windowser , because Windows users usually buy a monitor, because they will not be used to the command line interface at all. After all, Windows is a dead star system without a monitor.

OK, let's assume you are a Linux user, then

First case:

I don't have money to buy a monitor for the Raspberry Pi, and I only have an Internet cable left from my home broadband connection and a wireless router for Internet access. How can I know the IP address of the Raspberry Pi?

At this time, you only need to connect the Raspberry Pi to the wireless router LAN interface with an Ethernet cable and log in to the wireless router user management interface.

192.168.0.1

or

192.168.1.1

Then you can see an IP that is not your PC, that is the IP of your Raspberry Pi

Some people may say, using ifconfig, isn’t that nonsense? If you can't log in, where can you run ifconfig? My suggestion:

1. View from the router (troublesome)

2. Just write a program to loop through 192.168.1.1---192.168.1.255. This is what I did. The timeout for each connect detection is 100ms. I can quickly find the Raspberry Pi IP address, as follows:

Done.

Second case

I am a poor college student. I want to learn embedded system for the first time. I saved money to buy a Raspberry Pi. Then I just connected an Ethernet cable. How can I know the IP address of the Raspberry Pi?

There is a protocol in the TCP/IP protocol called ARP which is used to map IP addresses in a local area network to MAC addresses.

At this point, those who know the tricks will know how to do it. It’s okay if you don’t know. Let’s continue.

The ARP protocol is for the first communication service within the LAN. Each host will poll the IP address. The host with this IP address must send its MAC address to the host that initiated the ARP poll according to the ARP protocol.

Then we use this

I am a Debian user here, other Red Hat users can change the command by themselves

enter

sudo apt-get install arp-scan

Then install a small software like this

Then here, pay attention

Use arp-scan in root mode

so

sudo arp-scan -interface eth0 --localnet

-interface option specifies the network port to use. In our case, it is the wired network port eth0, which is short for Ethernet.

--localnet indicates that we want to use the ARP protocol within the LAN segment

Isn't the IP address divided into four segments, ABCD? We only use ARP within the LAN segment, for example:

Your PC LAN IP address is 192.168.1.9 and the subnet mask is 255.255.255.0

Then arp-scan will only send ARP packets to IP addresses in the network segment 192.168.1.0/24, that is, 192.168.1.2-192.168.1.254

Then wait for a while, the IP of the Raspberry Pi will come out, and then you can ssh using this IP

ssh -l pi xxxx

Then enter your password

raspberry

OK, login to Raspberry Pi is successful

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