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Apple Computing Products:
macOS - Operating System
Yosemite Causing Havoc on my iMac
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<blockquote data-quote="MacInWin" data-source="post: 1626505"><p>Ah, I missed in your first post that you have two routers! Now we have something to investigate! I have Comcast as well, and their default router (at least in our area) is both Ethernet and WiFi. And it supports DHCP as a default. But your Apple AE also is Ethernet and WiFi, and is a DHCP host as well. So you probably have two devices trying to assign IP numbers to your iMac. And one of those is coming over Ethernet (probably from the AE, if that is where your cable goes) and another over WiFi (could be from either router). And having two IPs on one machine is not a good thing! So, the quickest way to fix it is to turn off WiFi on the iMac. That will disconnect you from the WiFi portion of the router(s) and leave ONLY the Ethernet. To do that in System Preferences just click wifi interface and and click Turn WiFi OFF button. </p><p></p><p>Turning off WiFi on the System preferences page is ONLY for your iMac, not for anything else. If you are curious about the "troller" entries, just click on one of them, then on the Advanced tab and the name will be expanded to let you see the full interface name. I have several, including a couple of FireWire and Thunderbolt controller interfaces that aren't connected. You can ignore them, they don't matter. </p><p></p><p>However, there is something that you need to do. You should only have ONE router issuing IP numbers as a DHCP Host and only one WiFi router in that mode. Right now you probably have two, the one from Comcast and the Apple AE. You have two options: get Comcast to turn off the DHCP on the Comcast router and turn it into just a modem to interface from their network to your network, leaving the AE to provide IPs for everything; or do the opposite and have the Comcast router provide all IPs, disabling the DHCP server on the AE. I think the default IP range from the Comcast is in the 10.0.1.X range and the default on the AE is in the 192.168.1.X range, but I'm not totally confident on that. I've seen it vary as both of those ranges are designated for private networks. To turn off the DHCP on the AE if you do a search on "Airport Extreme Bridge Mode" on the internet, you may find a simple set of instructions. I did that search, but didn't have the time to read all the responses. Also, <a href="http://www.mac-forums.com/forums/internet-networking-wireless/316238-mac-vs-xfinity-comcast.html" target="_blank">this thread</a> has more information on what another comcast user did, and mirrors sort of what I did. I called Comcast and had them turn off the DHCP function and the WiFi function, which basically turned it into just a dumb modem. All my network now comes from my AE. I had to be patient with the Comcast techs as they are not Apple-proficient and it took a while to get to a tech who spoke Apple.</p><p></p><p>That is confusing. If the icon shows on the desktop, it should show in Finder. What happens when you click on the icon? Does Finder open to the drive? Does it appear in Disk Utility?</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1626505"] Ah, I missed in your first post that you have two routers! Now we have something to investigate! I have Comcast as well, and their default router (at least in our area) is both Ethernet and WiFi. And it supports DHCP as a default. But your Apple AE also is Ethernet and WiFi, and is a DHCP host as well. So you probably have two devices trying to assign IP numbers to your iMac. And one of those is coming over Ethernet (probably from the AE, if that is where your cable goes) and another over WiFi (could be from either router). And having two IPs on one machine is not a good thing! So, the quickest way to fix it is to turn off WiFi on the iMac. That will disconnect you from the WiFi portion of the router(s) and leave ONLY the Ethernet. To do that in System Preferences just click wifi interface and and click Turn WiFi OFF button. Turning off WiFi on the System preferences page is ONLY for your iMac, not for anything else. If you are curious about the "troller" entries, just click on one of them, then on the Advanced tab and the name will be expanded to let you see the full interface name. I have several, including a couple of FireWire and Thunderbolt controller interfaces that aren't connected. You can ignore them, they don't matter. However, there is something that you need to do. You should only have ONE router issuing IP numbers as a DHCP Host and only one WiFi router in that mode. Right now you probably have two, the one from Comcast and the Apple AE. You have two options: get Comcast to turn off the DHCP on the Comcast router and turn it into just a modem to interface from their network to your network, leaving the AE to provide IPs for everything; or do the opposite and have the Comcast router provide all IPs, disabling the DHCP server on the AE. I think the default IP range from the Comcast is in the 10.0.1.X range and the default on the AE is in the 192.168.1.X range, but I'm not totally confident on that. I've seen it vary as both of those ranges are designated for private networks. To turn off the DHCP on the AE if you do a search on "Airport Extreme Bridge Mode" on the internet, you may find a simple set of instructions. I did that search, but didn't have the time to read all the responses. Also, [URL="http://www.mac-forums.com/forums/internet-networking-wireless/316238-mac-vs-xfinity-comcast.html"]this thread[/URL] has more information on what another comcast user did, and mirrors sort of what I did. I called Comcast and had them turn off the DHCP function and the WiFi function, which basically turned it into just a dumb modem. All my network now comes from my AE. I had to be patient with the Comcast techs as they are not Apple-proficient and it took a while to get to a tech who spoke Apple. That is confusing. If the icon shows on the desktop, it should show in Finder. What happens when you click on the icon? Does Finder open to the drive? Does it appear in Disk Utility? [/QUOTE]
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Yosemite Causing Havoc on my iMac
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