AND, since it remembers the correlation between MAC and IP addresses, it will generally assign the same IP address repeatedly to the same device upon "renewal". As a safeguard, though, the server generally will work through the pool from front to back before recycling addresses. " The server keeps a "pool" of addresses, keeps track of the correlation between MAC addresses and IP addresses, and avoids handing the same address out twice (unless expired). The server responds, handing out an IP address. Note that there can be only ONE DHCP server on a physical/logical subnet. Any DHCP server, please respond with an address." MAC address is the unique Ethernet (not IP) address of the device. a device sends a broadcast message, saying essentially "I need an IP address assigned. I'm curious what Tekken mean by "tethered" too.įurther explanation: DHCP works like this. I think at this point you need help from your Internet provider.ĭo you rent the modem from them, or did you buy the modem?ĭoes your internet provider include "multiple IP addresses"? Usually this would be something you would pay extra for. Perhaps the previous router did not have DHCP set up? Maybe it was configured for "DHCP pass-through". It sounds to me like you may have TWO DHCP servers - one on the Airport Extreme, and one on the modem. as a practical matter, no DHCP reservation lasts more than 24 hours, and so they would have expired long ago. So, it has nothing to do with the hardwired devices in the downstairs rooms? That was a false correlation? So, if there were devices with fixed addresses, there wouldn't be any conflict - in fact, you wouldn't be able to reach the devices at all! Did you reconfigure any of these after changing routers? I'm really surprised that you have IP address conflicts, because the new router uses a different subnet than the old one. (What did UDI tech support have you do to resolve?) If you followed my instructions (or similar) on your other post about your new router, you should remove the Ethernet 2 interface from your Mac now. I don't see anything in your basement that needs a fixed IP address. But the best way to achieve a fixed address is to make a DHCP reservation on your router. Then it will have to be at a fixed address. You only need a fixed address if, for example, you will set your router to forward some Internet port to a device. Most devices are fine with a DHCP pool address. But I would never use them, because you can achieve essentially the same thing with a central control point by using DHCP reservations. For example, go into "Settings" on the Apple TV, and find your way to the network status page.įixed IP addresses are EVIL unless you keep GOOD track of them - AND know what you are doing. See if the device is set to use DHCP, or instead has a fixed IP address assigned. It will take some digging into documentation. Unfortunately, if conflicting with a DHCP pool address, the problem could "go away" for quite some time, and then come back.Ĭheck the configuration of each device. You probably have one of more devices that have been assigned FIXED IP addresses, and there is a conflict with either another fixed IP address or a DHCP pool address. Allow sufficient time for trouble to appear. One by one, REBOOT (or power-cycle) and re-connect each device. If your ISP router / modem was not in play here its more likely your basement computers were still using the leased DHCP addresses.Ī simple release / renew of the IP address will flush the computer and grab a new DHCP address offered by the AE.ĭisconnect the Ethernet cables from all of the devices in the basement. Your job is to first determine if you have a router / modem and if you do are you using it? If you did use it simply check if the IP ranges are the same and refresh the unit. Also note if your modem is a *Router / Modem* and you used it before and it was bridged this may also be the root cause. Normally when you reboot a computer the system will obtain the new IP address handed out by the router. NOTE: Anytime a computer is set to DHCP a predefined IP lease is present. Power up the AE and report back if the upstairs vs down stairs computer operate with out conflict. Use the Ethernet cable that comes directly from the AE and plug it into any of the basement computers and power on.ĥ.
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