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Forum Discussion
DHCP address reservations had not been respected
I am having similar issues with a RS280 and firmware 1.0.6.16.
We recently had an extended power outage that outlasted my UPS. When the power returned, most of the DHCP address reservations had not been respected. Looking at the reservation interface, all of my established reservation entries were there, but the attached devices list showed randomly assigned IP addresses.
I did a power cycle on a couple of the devices and they were assigned the proper IP addresses. But that's a non-starter.
I will double check, but I believe that all of the misassigned IP addresses were for wired connections.
11 Replies
Has a factory reset and set from scratch been performed since last FW update?
What brand and model# are these ethernet devices?
Are all ethernet devices connected beind the RS Router or is there a LAN switch in between the router and these ethernet devices?
Brand and model# of the ISP modem or ONT that the RS router is connected too.
What is the IP address subnet your using for the Router? Defailt 192.168.1.2 thru .254?
No, I did not perform a factory reset after firmware update. It was annoying enough to put in all my IP reservations the first time. I can't see re-entering all of my network configuration every time Netgear releases a security update.
There is a PoE switch between the router and six of the Ethernet devices (IP cameras) and a hub between the router and two PCs.
Not sure why the ISP modem is relevant as I have turned off its DHCP server. The RS280 assigned IP addresses, just not the correct ones.
DHCP IP address range is 10.0.0.2 - 10.0.0.254
Thanks for the help!
You can save off a router back up configuration prior to performing the factory reset and setup from scratch. Can re-load the back up configuration. I would first test a bit more before applying the back up configuration to ensure your not re-introducing anything in to the mix.
Check with the devices to ensure the devices are configured correctly to get DHCP IP reserved IP addresses.
Do all devices get a random IP address with IP addresses set for reservations on the RS router?
I would test the ethernet PCs directly connected to the router with out being connected to this PoE switch. This could be causing issues. Brand and model# of this PoE switch?
I presume the PoE switch is for the IP cameras?Brand and model# of the two PCs?
Brand and model# of the ethernet adapters with in these two PCs?
How many devices are connected to the router in total?
Brand and model# of the ISP modem as it is relevant to the configuration and how it interacts with the router. Even if DHCP is disabled. Hard to help you out fully with out know full details here.
Is the modem fully in bridge mode or just DHCP disabled?
Try chaning the DHCP IP address range to 10.0.0.100 to 10.0.0.200
We recently had an extended power outage that outlasted my UPS.
So everything ended up powered down?
What devices needed to be restarted manually?
Do you recall what devices would have started up before the router?
So everything ended up powered down?
What devices needed to be restarted manually?
Correct. The entire house was down for the count. The router & other essentials lasted longer, but in the end, everything was off.
The devices that had to be started manually was just the HTPC. Everything else is set to boot on resumption of power.
Do you recall what devices would have started up before the router?
I'm not entirely sure. The router seems to take quite a while to boot & broadcast. My guess is that just about everything was active on the network before the router and of course everything with a battery would have still been active during the outage (phones, tablets, bird feeder, etc.). Possible exceptions may be the two Synology NAS.
The key to solving many networking problems is to be able to replicate the problem and record useful information while doing so.
This DHCP issue is a difficult situation to diagnose because experimenting would mean cutting power to the house to force (a) the router to reboot and (b) every device to request network connection.
Does the RS280 have "Debug options"? on the Orbi product line, there is an undocumented web page called "debug.htm" (i.e. <address of the router>/debug.htm) which offers the ability to capture the traffic on the WAN and LAN ports (not the WiFi):
If this is set to begin capturing when the router starts, it should record the DHCP conversations between the router and devices on the LAN. The internal storage will overflow pretty quickly, so it is essential to stop the capture and write the results to a computer before the initial information is lost.
Certainly not a trivial undertaking.
This DHCP issue is a difficult situation to diagnose because experimenting would mean cutting power to the house to force (a) the router to reboot and (b) every device to request network connection.
I think manually powering down the router and some of the ethernet devices might be enough. I don't see any need to cut power to the house.
But still, this could be hard to replicate. My guess is is that there is short window when the router boots when the DHCP service is running but the reservations are not yet loaded from the config file.
Agree. A good "first step" would be to power cycle just the RS280 router. I (personally) would tap the Ethernet cable connecting the RS280 and the switch and set up Wireshark in promiscuous mode to capture the DHCP traffic.
