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R7000 DHCP creating multiple IP addresses for one device
I noticed that my R7000 is creating multiple IP addresses for an Apple Airport Extreme (3rd gen) and an Apple Airport Express (2nd gen). When I view the Access Control list, it shows both devices eating up all the available DHCP addresses. For example, the Express is showing 192.168.254.2, 192.168.254.3, 192.168.254.4, etc but the associated MAC addresses are all the same. Both are wired into the router and have been assigned static IP addresses. If I ping one of the "extra" IP addresses (using Terminal in OSX), I see this (where 192.168.254.85 is the static address):
PING 192.168.254.2 (192.168.254.2): 56 data bytes
36 bytes from 192.168.254.85: Redirect Host(New addr: 192.168.254.2)
If I reboot everything, it clears things up temporarily. But over time, these two Apple devices will start using up all of the available DHCP addresses. I've tried toggling the "Disable IGMP Proxying" checkbox. And I also changing the RIP version to RIP_1. Both of the Apple devices are set up in Bridge Mode.
I can't tell if this is actually hurting anything except that new devices can't connect since there are no available IP addresses. I noticed this about a week ago and just updated the router firmware to V1.0.5.48_1.1.79. However, the problem is still persisting.
Glad it's working again,
I think static and reserved get confused more often than not. Some think they are the same which they are not. I believe using address reservations is the best way to avoid problems on SOHO networks, If you want to assign same IP's to certain devices. This also let's you leave all devices to DHCP when on home network they are assigned a specific IP and when traveling you don't have to change settings.
I use 30 reserved addresses and the DHCP works fine and doesn't need any special settings to avoid the reserved IP's. Not sure I understand the setttings you selected for the two apples But, the thing to remember is ONLY one DHCP server per network.
7 Replies
All of the router functions were originally set to their defaults except that I had assigned static IP's for some of my devices. Then I noticed the multiplying IP addresses for those two Apple devices. After that, I assigned static IP's to them but that didn't help. Then I updated the router firmware. Then I started messing with the other settings (IGMP and RIP_1) based on some web searches.
I suspect that this problem has been happening since I bought the router a few months ago. Every now and then, devices weren't connecting so I would reboot the router. Looking back, all of the IP addresses in my DHCP range must have been used up and rebooting the router cleared things up (temporarily).
The router's log file isn't showing anything unusual.
Seems odd that a device with a properly configured static IP would even send a request for an IP. Did you change the LAN TCP/IP setup? The router is capable of over 200 IP's so if your running out as you say then I suspect your apples are misconfigured. Leave the RIP version disable too.
I've had no problems using address resevations for 30 devices .2 ~.30 & .99 for AP You might give it a try