8Network tools

8.1Finding the IP address

In Section 7.5, we discussed how a device gets an IP address. But how do we know what it is? This is a common problem when working with TCP/IP based devices. Normally, you know which TCP port you want to address, but what is the IP address?

A very common strategy is to give up on finding the IP address, and instead simply set it to its default. Many devices have a reset button of some kind, and a label specifying the default IP address and mask. The default is typically a static address like, for example, 192.168.1.1 with mask 255.255.255.0. In other words, an address in a private range in a /24 network. After resetting to this default, you configure an Ethernet port on your PC to, for example, 192.168.1.2 ...

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