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I've been looking for some examples to configure a subnet, and I've seen that, for example, when you have this IPv4 network for the hosts 192.168.0.0/24, people use this IPv4 network for the serial: 10.0.0.0/30. So, why do they do that? Wouldn't be better to just use the same IPv4 range 192.168.X.0/30?

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It doesn't matter. There is no better IP address range for any type of interface. It may be that examples use the 10.0.0.0/30 network because it is easy to see that it is different and clear that it is a different use.

The old-school way of doing point-to-point links was with /30 networks, but that wastes half of the addresses in a network. About 16 years ago, RFC 3021, Using 31-Bit Prefixes on IPv4 Point-to-Point Links was released to specifically allow /31 networks for point-to-point links. Some hardware manufacturers never adopted the RFC, and none of the carriers of which I know did.

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