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We can assign one public IP address to a network, and within the network, distribute the private IP addresses which can come from one of the three reserved ranges:

  • 10.0.0.0 – 10.255.255.255/8 (16,777,216 hosts)
  • 172.16.0.0 – 172.31.255.255/12 (1,048,576 hosts)
  • 192.168.0.0 – 192.168.255.255/16 (65,536 hosts)

Is it correct that in the network, we can assign one private IP address (e.g. 192.168.0.10) to a "subnetwork", and within that "subnetwork", we can distribute private IP addresses in range 192.168.0.0 – 192.168.255.255 to the hosts in the "subnetwork", and 192.168.0.10 in the "subnetwork" and 192.168.0.10 in the original network can coexist and refer to different things?

Thanks.

Tim
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1 Answers1

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No. IP addresses are unique. If you’re using private addresses, they will be unique within your organization.

Ron Trunk
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  • Inside your organization, if there is a router, can the hosts under that router reuse the privates IP addresses in your organization? I think yes. – Tim Feb 11 '19 at 20:22
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    Absolutely not. Think of addresses like telephone numbers. You can’t have two people with the same number. – Ron Trunk Feb 11 '19 at 20:25
  • isn't it that a router create a new scope for reusing private IP addresses? – Tim Feb 11 '19 at 20:39
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    No. A router forwards packets from one network to another. If two devices have the same address you won’t be able to tell them apart. A host with the address 192.168.2.3 is the same host regardless of the subnet mask. – Ron Trunk Feb 11 '19 at 20:58
  • "A router forwards packets from one network to another. " At your home, when you uses a router and modem to connect to your ISP, does the router create a new network inside your home? When you use a second router to connect to the router, does the second router create a new network, in which you can reuse all the private IP addresses again, in the sense that they overlap with those IP addresses assigned by the first router? – Tim Feb 11 '19 at 21:05
  • No, you can't reuse them. BTW, home networking questions should be asked on [su]. – Ron Trunk Feb 11 '19 at 22:14