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Apple Computing Products:
macOS - Desktop Hardware
iMac27 Dropping Ethernet Connection
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<blockquote data-quote="MacInWin" data-source="post: 1878957" data-attributes="member: 396914"><p>Yes, the IP numbers will be different. Your router should be issuing a number like 192.168.x.y or 10.x.y.z. But the default internal number start with 169.x.x.x or 127.x.x.x, usually. The system needs some number just to run, so it uses a pre-defined dummy as the feedback number. When it connects to the router, that number is replaced by what the DHCP server in the router assigns, which are in one of the two ranges I gave. Then the router maps the specific number from your machine on the internal network to the IP address assigned to the router from your ISP so that it can then translate incoming and outgoing packets for you. So, again, what seems to be happening is that for some reason the IP is not being renewed and the iMac defaults to the loopback IPs instead of the IP needed to communicate with the router. Given that other devices are renewing, it is some setting in you iMac Network setup.</p><p></p><p>Did you try what Lisa suggested about a new location? You didn't say whether or not you had done that. </p><p></p><p>For reference, here are my settings both in System Preferences/Network and in the Advanced tab.</p><p>[ATTACH=full]33670[/ATTACH]</p><p></p><p>[ATTACH=full]33671[/ATTACH]</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1878957, member: 396914"] Yes, the IP numbers will be different. Your router should be issuing a number like 192.168.x.y or 10.x.y.z. But the default internal number start with 169.x.x.x or 127.x.x.x, usually. The system needs some number just to run, so it uses a pre-defined dummy as the feedback number. When it connects to the router, that number is replaced by what the DHCP server in the router assigns, which are in one of the two ranges I gave. Then the router maps the specific number from your machine on the internal network to the IP address assigned to the router from your ISP so that it can then translate incoming and outgoing packets for you. So, again, what seems to be happening is that for some reason the IP is not being renewed and the iMac defaults to the loopback IPs instead of the IP needed to communicate with the router. Given that other devices are renewing, it is some setting in you iMac Network setup. Did you try what Lisa suggested about a new location? You didn't say whether or not you had done that. For reference, here are my settings both in System Preferences/Network and in the Advanced tab. [ATTACH type="full"]33670[/ATTACH] [ATTACH type="full"]33671[/ATTACH] [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
iMac27 Dropping Ethernet Connection
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