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Apple Computing Products:
macOS - Operating System
Networking - Sierra DHCP Issue
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<blockquote data-quote="MacInWin" data-source="post: 1765510"><p>Patrick, the 192.168.x.y range of IPs is a clever way to solve the issue of multiple addresses in a small network but a limited number of IP numbers worldwide. Basically, the router in your home has two IP numbers. One it gets from your ISP and is in a range of numbers assigned to your ISP provider by the managers of the Internet, ICANN. The other is in a range either starting with 10.x.y.z or 192.168.x.y and is controlled by the DHCP server in the router. Basically, the router shares the one IP from the ISP with all of the devices in the network the router manages by mapping their 192.168.x.y IP number onto that external number, then when a response comes back from the Internet, it routes the response to the appropriate 192.168.x.y device within the local network. From the article, the University of Guelph apparently has it's internal network set up with a range of IP numbers and does not use the 192.168.x.y standard internally. That's ok, as long as the University isn't using rogue IP numbers that someone else in the universe has paid for through ICANN. EDIT: So, the University is saying to users that if they have an IP of 192.168.x.y, it didn't come from the University and their computer is NOT connected to the University LAN directly. It still could be connected through the university network if the DHCP server that provided the IP 192.168.x.y is connected to the University LAN, which is why they called it "rogue."</p><p></p><p>There is nothing "magic" about either 10.x.y.z or 192.168.x.y. In fact, if you wanted to, technically you COULD set your own home network up with any IP range you wanted to. But if you then venture out into the Internet, you have to play by the rules of ICANN and not use those internal numbers because they may interfere with someone else's network assignments.</p><p></p><p>But the "custom" is to have 10.x.y.z and 192.168.x.y to be the ranges used "inside" the modem from your ISP.</p><p></p><p>As far as Bill Gates, I don't know anything about his involvement in the selection of that range. Here is some information from the Internet search engine, WhoIs:</p><p></p><p><a href="https://www.whois.com/whois/192.168.0.1" target="_blank">https://www.whois.com/whois/192.168.0.1</a></p></blockquote><p></p>
[QUOTE="MacInWin, post: 1765510"] Patrick, the 192.168.x.y range of IPs is a clever way to solve the issue of multiple addresses in a small network but a limited number of IP numbers worldwide. Basically, the router in your home has two IP numbers. One it gets from your ISP and is in a range of numbers assigned to your ISP provider by the managers of the Internet, ICANN. The other is in a range either starting with 10.x.y.z or 192.168.x.y and is controlled by the DHCP server in the router. Basically, the router shares the one IP from the ISP with all of the devices in the network the router manages by mapping their 192.168.x.y IP number onto that external number, then when a response comes back from the Internet, it routes the response to the appropriate 192.168.x.y device within the local network. From the article, the University of Guelph apparently has it's internal network set up with a range of IP numbers and does not use the 192.168.x.y standard internally. That's ok, as long as the University isn't using rogue IP numbers that someone else in the universe has paid for through ICANN. EDIT: So, the University is saying to users that if they have an IP of 192.168.x.y, it didn't come from the University and their computer is NOT connected to the University LAN directly. It still could be connected through the university network if the DHCP server that provided the IP 192.168.x.y is connected to the University LAN, which is why they called it "rogue." There is nothing "magic" about either 10.x.y.z or 192.168.x.y. In fact, if you wanted to, technically you COULD set your own home network up with any IP range you wanted to. But if you then venture out into the Internet, you have to play by the rules of ICANN and not use those internal numbers because they may interfere with someone else's network assignments. But the "custom" is to have 10.x.y.z and 192.168.x.y to be the ranges used "inside" the modem from your ISP. As far as Bill Gates, I don't know anything about his involvement in the selection of that range. Here is some information from the Internet search engine, WhoIs: [url]https://www.whois.com/whois/192.168.0.1[/url] [/QUOTE]
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