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Re: Nighthawk R7960P assigns same IP address to multiple devices

HoustonGuyNW
Aspirant

Nighthawk R7960P assigns same IP address to multiple devices

I have a problem with my Nighthawk R7960P assigning the same IP address to multiple devices.  How can I resolve these conflicts and what steps should I take to isolated the problem?

 

Firmware v1.4.1.50

App 2.6.4.13

Model R7960P

29 devices connected both wired and wireless

1 additional AP for wifi

1 switch with 4 devices connected to one LAN port on the router

Multiple device types (Windows, iOS, etc)

 

 

Model: R7900P|Nighthawk X6S AC3000 Tri Band WiFi Router
Message 1 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> I have a problem with my Nighthawk R7960P assigning the same IP
> address to multiple devices. [...]

 

   Not impossible, but very unlikely.  More likely would be that you
have more than one DHCP server on your LAN.

 

> 1 additional AP for wifi

 

   What, exactly, might that be?

Message 2 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

Its a Linksys model EA6350 router setup in "bridge" mode.  It is connected to a switch at one end of the house for WIFI only use. I have an ethernet link from the Nighthawk R7960P router that connects to the switch as well.

 

 

Message 3 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> It[']s a Linksys model EA6350 router setup in "bridge" mode. [...]

 

   What, exactly, does 'setup in "bridge" mode' mean to you?  Wireless
access point?  Some other mode?

 

> [...] It is connected to a switch at one end of the house for WIFI
> only use. I have an ethernet link from the Nighthawk R7960P router that
> connects to the switch as well.

 

   A cable has two ends.  What, exactly, is connected to what, exactly?
(Hint: If a device has different types of Ethernet ports, then
"connected to device" is not enough detail.)

 

   A router like the EA6350 normally runs a DHCP server, and certainly
_could_ (still) be running its DHCP server, which might account for this
problem.

Message 4 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

   An interesting test might be to disable the DHCP server in the
R7960P, and see if a new client device still gets good IP parameters
(from some other DHCP server on your LAN). (ADVANCED > Setup > LAN
Setup : Use Router as DHCP Server)

 

   Or, remove the EA6350, shut down everything, restart everything, and
see if the problem persists/recurs.

 

   Of course, some other over-capable device on your LAN could run a
rogue DHCP server, too.

Message 5 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

I'll give that a shot.

 

The Linksys device in bridge mode (from my understanding) should only be redirecting WIFI or its LAN ports to the R7960P via the ethernet cabling (LAN port to LAN port) to handle the rest. I have it set with no LAN ports used.  I'll to remove it to see what happens.

 

I did go in and set one of the devices (phone) to a different static IP and rebooted.  In that case that IP stayed assigned to the duplicate device (printer) and the phone did change.  However, the other pairs of duplicated IP addresses did nolt change.

 

I'll let you know what happens when I test the Linksys node.

 

 

Message 6 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> I'll give that a shot.

 

   Which "that"?

 

> The Linksys device in bridge mode (from my understanding) [...]

 

   I still don't know what "bridge mode" means to you, or what you did
to the configuration on the EA6350, or how you connected anything to
anything else.  I know even less about your understanding of anything
(or where you got it).

 

> I did go in and set one of the devices (phone) to a different static
> IP and rebooted. [...]

 

   You went into _what_, and did _what_, exactly?  "rebooted" _what_?

One of your routers?  The phone?  Everything?

 

   Terminology: A "static" address is configured on the device itself.
What you configure on a (DHCP server on a) router is a reserved dynamic
address, not a static address.


> [...] should only be redirecting WIFI or its LAN ports to the R7960P
> via the ethernet cabling (LAN port to LAN port) to handle the rest. I
> have it set with no LAN ports used. [...]

 

   If you're trying to use the EA6350 as a wireless access point, then
you'd need to do more than move a cable from its WAN/Internet port to
one of its LAN ports.  See, for example:

 

      https://community.netgear.com/t5/x/x/m-p/1463500

 

   That's written for a Netgear C6300-as-WAP, but the steps are about the
same for any other router (any make/model) which lacks a one-step WAP
option.

 

   One of the steps in that procedure is disabling the DHCP server on
the router-as-WAP.  Simply moving a cable would not disable the DHCP
server on the router-as-WAP.  Running multiple DHCP servers on your LAN
might easily cause address duplication/conflicts.


   Many Netgear routers have a one-step WAP mode option.  For example,
see "Set Up the Router as a WiFi Access Point" in the R7960P User
Manual.  I haven't tried to find anything similar in the EA6350
documentation, which, if it exists, might make things easier.  _If_
that's what you're trying to do.

Message 7 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

The "bridge mode" as I am interpretting from Linksys is similar to a wireless bridge except the LAN/Ethernet connection provides the communication to the Netgear router for DHCP assignments and routing.

 

I just set all wifi to the Netgear "smart wifi" and it did reset the SSID on the Linksys router to match.  The WIFI seems to work right as I can go from one end of the house to the other and get 4 bars. 

 

But, an Apple TV and an LG TV both still show the same IP address.  I'll go power cycle those and see if it resets correctly. The other devices now are on different IP adresses.

 

What I called static IP was addresses I set on the Netgear Router for 4 specific devices (Security cameras) and AV equipment.

 

I'll update you when I power cycle everything.

 

 

 

 

 

Message 8 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> The "bridge mode" as I am interpretting from Linksys [...]

 

   I don't know what any of that means.  What, exactly, are you
"interpretting"?  Are you following some set of instructions (from
Linksys? Or anywhere?), or just playing around?

 

   It sounds as if you're expecting the EA6350 to _know_ that you want
it to act as a wireless access point, just because you connected a cable
to a different (LAN) port.  It's not that clever.  If you didn't do
something explicitly to disable the DHCP server in the EA6350, then I'd
(still) guess that that's your problem.

 

> I'll update you when I power cycle everything.

 

   If you continue to have multiple active DHCP servers, then I wouldn't
expect much improvement.

Message 9 of 24
CalCal23
Apprentice

Re: Nighthawk R7960P assigns same IP address to multiple devices

@HoustonGuyNW 

 

You might want to try the latest firmware for this series of routers.  The latest on the R8000P which is almost identical is a .64 version number.

 

In previous versions of the firmware the Attached Devices status page from the router was ALWAYS incorrect.

 

If you have your secondary router / access point in bridge mode and you're sure of that, then give this a try.  I've found that the latest firmware from Netgear on these routers specifically is good, not excellent, but more accurate and usable for in home network management.

 

Trust me, the people on the forums have been complaining for a while....like 2 years at least...

 

 

Message 10 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> You might want to try the latest firmware for this series of routers.
> [...]

 

   You might, but I wouldn't expect new firmware for the R7960P to get
your EA6350 configured correctly.

 

> If you have your secondary router / access point in bridge mode and
> you're sure of that, [...]

 

   So far, I've seen no evidence that anyone here knows what "bridge
mode" means, no matter how sure he might be about anything.  Certainly,
no one is using it the way Netgear does.  For example, in the R7960P
User Manual, look for "Set Up the Router in Bridge Mode".  (The
differences were more obvious before Netgear dropped all the helpful
pictures from its user manuals, but some careful reading might still do
the job.)

 

> Trust me, [...]

 

   Why?  Because you're offering "solutions" for unrelated problems?  My
confidence is uninspired.

Message 11 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

This is what links says about the Bridge mode ----->

"""

Setting your Linksys Smart Wi-Fi Router to Bridge Mode is applicable when you want to:

- Connect two (2) routers with the capability of sharing the network resources
- Use the router as an additional access point on an existing network
- Connect the router to a modem/router from your Internet Service Provider (ISP)
- Disable the router functionalities to work with third party devices

 

NOTE: Setting your Linksys Smart Wi-Fi Router to Bridge Mode will disable all its router capabilities and turn it into an access point. The router will cease to act as a DHCP server and its built-in firewall as well as the NAT features will no longer be in effect.

"""

 

Today I am going to reset to factory settings and see if there is some obscure switch that is set before configuring for the AP I am trying to achieve.  Granted I am not a pro with this.  Both routers are up to date with the firmware.

 

Still showing duplicate IP adresses.  Noticed that one iPhone keeps being assigned to a duplicate.  The others are just random devices.

 

Message 12 of 24
CalCal23
Apprentice

Re: Nighthawk R7960P assigns same IP address to multiple devices

@HoustonGuyNW 

 

Reboot your Netgear router....and ensure that your Linksys router is in AP mode only.  Then you should be good to go.  Please report back with your findings....

 

Turn off DHCP on your Linksys router if you have a setting toggle for that.  It will stop that router from creating a Native Address Table (NAT) and assigning IP addresses to attached devices (DHCP function).

Message 13 of 24
antinode
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices

> This is what links says about the Bridge mode ----->

 

   A link to whatever you're reading would be more helpful than your
selected excerpts.

 

   Better clues as to exactly what you did after reading this stuff
might help, too.

 

> [...] The router will cease to act as a DHCP server [...]

 

   That would be good.  My guess is that it's not happening, for some
reason or other.  Sadly, with my weak psychic powers, I can't see what
you read, or what you did.

 

> [...] Both routers are up to date with the firmware.

 

   As always, an actual version number would be more useful than your
opinion of what's "up to date" today.


> Still showing duplicate IP adresses. [...]

 

   If you still have two active DHCP servers, then that would not amaze
me.

 

> An interesting test [...]

 

   Did you ever try any of those?

 


> [...] ensure that your Linksys router is in AP mode only. [...]

 

   [Palm->forehead]  Why didn't _I_ think of that?

 

> [...] It will stop that router from creating a Native Address Table
> (NAT) [...]

 

   A _what_?

 

   Configuring a router as a WAP stops it from being a _router_.
Netgear's list of disabled (router) features:

 

      https://kb.netgear.com/26765

 

I suspect that it'd be similar for the EA6350.

Message 14 of 24
CalCal23
Apprentice

Re: Nighthawk R7960P assigns same IP address to multiple devices

Apologies NAT is Network Address Translation...not to worry though...

 

It ties the MAC address of your devices (clients) to IP addresses assigned by the router....

 

My bad on the definition, but I know what it does...

Message 15 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

Ok routers are all set. Firmware was up to date, and DHCH on only one router. I have 2 MAC addresses for devices that are NOT in my house.  Check the appliances, the AV quipment, phones, computers, etc.  All is accounted for with these 2 still showing up in addition.  I have blocked them on the Netgear router.  One IP is still duplicated that is assigned to one of the devices that is not in my house.  The other device not in my house is no longer duplicated.  Both labels say iPhone on the Attatched Device list.

 

I set the RIP to go out only from the Netgear router using the RIP-1 option.

 

Everything seems to be working right now but obviously a conflict exists somewhere for 2 devices whose MAC addresses are not duplicaed on the Attached device list to show up.

 

Still open for suggestions.

 

 

Message 16 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

Message 17 of 24
schumaku
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices


@HoustonGuyNW wrote:

I have 2 MAC addresses for devices that are NOT in my house.



@HoustonGuyNW wrote:

Multiple device types (Windows, iOS, etc)


Well possible they are in your house... Here you go: Use private Wi-Fi addresses in iOS 14, iPadOS 14, and watchOS 7  Disable the Private Network feature for your network (all SSIDs)!

 


@HoustonGuyNW wrote:

I set the RIP to go out only from the Netgear router using the RIP-1 option.


What for? Any other routers in the play requiring RIP routing annoucemements need th einformation about multiple IP subnetworks? Probably not. Disable RIP-1 completely.

 

 

Message 18 of 24
HoustonGuyNW
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

Well it seems APPLE snuck in a new FEATURE..... The iOS 14 release added PRIVATE ADDRESS that generates a bogus MAC address for each wifi band that they connect to.  Explains the duplicate physical MAC addresses showing for the same device.  Then NETGEAR seems to release IP addresses for wired connections after a longer period than wifi connections.  This explains why the attched log shows multiple IP addresses.  Since the Linksys router set in BRIDGE MODE is a wired connection all devices that connect through it show up as wired on the NETGEAR router list.

 

After working through NETGEAR support and esentially reinstalling my Nighthawk router and the problem still showed.  I noticed that APPLE calls the MAC address a "WIFI ADDRESS" for use on a router. Then I had to go to APPLE to search for differences and it was disclosed that in the iOS 14 release that THEY added this FEATURE. With 6 Apple devices on my LAN its no woder so much unaccounted for was seen on the attached list.

 

I'm operational. RIght now the duplicates are at least understood.  As for as the impact to the network, the jury is still out.

Message 19 of 24
labatt
Mentor

Re: Nighthawk R7960P assigns same IP address to multiple devices

Glad you got it working and thanks for posting what you found.

 

You are not the first to have been bitten by the new feature, private address. Guess good in some environments, but not good when you have a site that has registered your MAC and they expect that. The DHCP server sees a new MAC every 24 hours so it assigns a new IP address. I am expecting more issues because of this. Turned off on my iPhone and iPad.

Modem CM2050V
Message 20 of 24
schumaku
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices


@HoustonGuyNW wrote:

Well it seems APPLE snuck in a new FEATURE.....


...and you are by far not the first victim!

 


@HoustonGuyNW wrote:

The iOS 14 release added PRIVATE ADDRESS that generates a bogus MAC address for each wifi band that they connect to.


As I wrote two days ago, right above here 8-)

In my understanding, it's per network (read the SSID and the broadcast domain). If users have xxx_24G and xxx_5G SSIDs these are two networks.

 


@HoustonGuyNW wrote:

Explains the duplicate physical MAC addresses showing for the same device.  Then NETGEAR seems to release IP addresses for wired connections after a longer period than wifi connections.  This explains why the attched log shows multiple IP addresses.  Since the Linksys router set in BRIDGE MODE is a wired connection all devices that connect through it show up as wired on the NETGEAR router list.


Of course - everything that comes over a wire aehm Ethernet LAN cable to the Netgear router is wired

 


@HoustonGuyNW wrote:

After working through NETGEAR support and esentially reinstalling my Nighthawk router and the problem still showed. 


Appears they are a little bit slow distributing new (months old) well known coming up issues.

 


@HoustonGuyNW wrote:

I noticed that APPLE calls the MAC address a "WIFI ADDRESS" for use on a router. Then I had to go to APPLE to search for differences and it was disclosed that in the iOS 14 release that THEY added this FEATURE. With 6 Apple devices on my LAN its no woder so much unaccounted for was seen on the attached list.


I won't comment this Apple ****** - completely ridiculous. Starting from the tin hat idea (basically a nice idea for privacy), going over the enforcement of this s**t for all existing stored network configurations, up to the lack of information when a connection to a network fails (because there are network admins having MAC access lists in place!).

 


@HoustonGuyNW wrote:

I'm operational. RIght now the duplicates are at least understood.  As for as the impact to the network, the jury is still out.


Send a fat invoice from Huston, TX to Apple, Cupertinino, CA for all your efforts.

Message 21 of 24
schumaku
Guru

Re: Nighthawk R7960P assigns same IP address to multiple devices


@labatt wrote:

The DHCP server sees a new MAC every 24 hours so it assigns a new IP address.


Where are these 24 hours coming from? Just curious ... when the team started iOS 14 developer release testing, our DHCP servers almost exploded 8-/

 

@labatt wrote:

Turned off on my iPhone and iPad.


Is there a global switch on iOS 14? IMHO it must be disabled by stored network resp. SSID, isn't it?.

 

Oh wile talking: Android 10 does bring the same tin hat thingie, too - but at least the moment where I had updated my devices, this was not forced on and existing network configs remained on "Use device Mac", same for configurations transferred form other Android 10 systems. For new SSIDs added, the default is "Use randomized MAC", it can be changed while adding, resp. when modifying the network under "Advanced settings". At least the Googlers understand how to use correct network terms.

 

For Apple a random MAC might be disgusting, so some marketing people decided to introduce a complete misleading designation.

 

And I started to like Apple to some point.

Message 22 of 24
labatt
Mentor

Re: Nighthawk R7960P assigns same IP address to multiple devices

@schumaku 

To keep privacy starting with iOS 14 there is a private network option which is on by default, This creates a MAC other then the iPhone or iPad MAC and changes that MAC on a 24 hour timeframe. They say to keep folks from tracking you. Good news is you can turn it off. Bad new on by default. Can cause issues on network as is being seen and also if a site you visit has saved your MAC here you come with a new one. 

Modem CM2050V
Message 23 of 24
jemasi3444
Aspirant

Re: Nighthawk R7960P assigns same IP address to multiple devices

The handiest issue that appears to resolve it changed into to trade the Intel motive force settings on every client to force the community adapter into N mode, that appears to forestall the problem and guidehttps://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Generate-a-certificate/m-p/893484 (however then I have slower Wi-Fi speed on each customer). Forcing clients to AC the use of the identical putting did no longer clear up it.

Message 24 of 24
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