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Edit/Add new IP reservations
I have an RBR50v2 Orbi router and 2 satellites with FW ver 2.7.5.6. I have entered 15, or so, reserved internal IP addresses using "Advanced > Security > Access Control". All works well. The is...
My observation*** of Netgear's DHCP programming is that when a device issues a DHCP renewal request, the Orbi router honors the request. In essence saying, "you've got it. you can keep it." It appears that what the router finds in its internal ARP table takes precedence over what is in the LAN Setup table.
I have found only two ways to force the router to tell the device to change IP address to what is in the LAN Setup table:
- Reboot the router. This forces every device connected to the router to go through the connection process. With the ARP table having no entry for any device, the router first looks in the LAN setup table. If no IP address is found there, one is randomly assigned from the DHCP pool.
- Power off the device. Define another device with the IP address that the device currently has and connect it to the network. Then, power up the device. When it asks for an IP address, the router will not find it in the ARP table because the device with the Static IP is in the ARP table, and then the router will go through the process of looking in the LAN Setup table.
This is not what we humans expect and would prefer.
*** An interesting experiment to perform:
- Power off a device.
- Change the IP in the LAN Setup table.
- Power the device back on.
- Check (on the device) to see what IP address is assigned.
My guess is that ARP table entries will "time out" if a device is left disconnected from the network. Internet search shows ARP table timeout varies by type of system (from seconds to hours).
Thank you for all your terrific support. I certainly appreciate the time you take for your replies.
CrimpOn, your reply was super helpful. I really thank you for that. You were correct, it appears that the ARP table entries indeed "time out" after leaving the device powered off for an hour or so.
Couple last questions please:
In my Orbi router, I goto the Advanced (Tab) > Setup > LAN Setup, and I checked "Use Router as DHCP Server" and I entered a "Starting IP Address" and I entered an "Ending IP Address". In addition, I have included all (40) of my Address Reservations within the "Starting" and "Ending" IP Address range. I presume, though, the "Starting" and "Ending" address range is to be used for Non-Reserved IP Addresses?? I did not Reserve IP Addresses for my two Orbi Satellites and the DHCP selected IP addresses for these devices were indeed selected inside the range that I had setup. In my thinking, the "Starting" and "Ending" address range should be set for RESERVED addresses since the "number of entries" for this type of address is a known count so that I can set the range intelligently, while the count of addresses for Non-Reserved addresses is not necessarily known. Are my thoughts correct?
Is it good practice to give each of my two Orbi satellites a Reserved IP Address? Is 40 Reservations reasonable? I give all my household devices a reserved IP addresses, is that not reasonable?
Is there a limit of IP Address Reservations I can add to my Orbi router?