Hey everyone, we just installed an Orbi Cable Modem here in the past week. Allow me to share my setup with you all. ISP: Comcast (no issue) CableModem: Orbi CBR40 - Firmware: V2.1.4.6_1.0.8 (In router mode) with one Satellite Connected: 1 Wireless 1000 Nonmanaged Switch Connection to the CBR40 Orbi RBR connected via Ethernet in AP Mode - Firmware: V2.1.4.16 with one connected Satellite Wireless. Here's the issue: The CBR is routing traffic / supping DHCP address to about 30-35 devices within our home. When devices leave the network such as iPhones, or devices fall asleep such as Macs, when they attempt to get reconnect via WiFi, they have issues negotiating an address. Upon looking at the DHCP table, the devices are "active" and did not fall off the list. Inspecting the DHCP serving page, I do not see a lease time available? Is anyone else having issues. This does not happen to hard wired devices, only WiFi devices and they are not happening to just one iOS device it is all devices running iOS11.x, and I'm an app developer so I'm running iOS Dev 12. Thoughts?

Is your SSID for CBK40 and RBK50 system same? Since they are two distinct system, they will not operate in same "mesh domain" (for the lack better terminology) and it might be creating problems. CBR40 is the primary DHCP server in the network. Although it might be aware of L3 information from devices, it wont have information about L2/L1 (roaming, wifi, etc) and it will would treat them as wired devices coming off RBR50. One suggestion is to: Make a network with CBR40, RBS20 and RBS50 and sync them together (Remove any RBR50 off the network)

Have you tried setting IP address reservations on your devices that sleep or go away and come back to the system?

What are total Number of the Orbis you have in your setup? CBR40 - Orbi Cable Router RBS20 - Satellite that came in CBK40 Kit Do you have another RBR50 connected in the setup in AP mode?

Still having the issues. It does not seem to be on the devices that are wired but often those that are wireless. We have the follwoing Orbi mesh system in a 4000 sq foot home. Orbi Cable Modem: CBR40 (This device is in router mode) Orbi Satellite: RBS20 connected wirelessly to the CBR40 Orbi Router: RBR50 (This device is in bridge mode) connected via ethernet to the CBR40 Orbi Satellite: RBS50 connected wirelessly to the RBR50 Per Netgear's support tech, I have binded the RBR50 (after putting it in bridge mode) to the the CBR40. I have additionally reserved the oast octet x.x.x.21 to my iPhone to test it. I'm still at my original issue: Here's the issue: The CBR is routing traffic / supping DHCP address to about 30-35 devices within our home. When devices leave the network such as iPhones, or devices fall asleep such as Macs, when they attempt to get reconnect via WiFi, they have issues negotiating an address. Upon looking at the DHCP table, the devices are "active" and did not fall off the list. Inspecting the DHCP serving page, I do not see a lease time available? Is anyone else having issues. This does not happen to hard wired devices, only WiFi devices and they are not happening to just one iOS device it is all devices running iOS11.x, and I'm an app developer so I'm running iOS Dev 12.

Does the CBK40 system work with out the RBR50 system being connected and turned ON? Just the cable gatway and 1 or 2 satellites connected to the CBR40? Whats the size of your home? SqFt?

Orbi Cable Modem DHCP Issues | NETGEAR Communities

11 Replies

FURRYe38
Guru
Jul 07, 2018
Have you tried setting IP address reservations on your devices that sleep or go away and come back to the system?
vkdelta
NETGEAR Employee Retired
Jul 09, 2018
What are total Number of the Orbis you have in your setup?

CBR40 - Orbi Cable Router

RBS20 - Satellite that came in CBK40 Kit

Do you have another RBR50 connected in the setup in AP mode?
- matthewtshaver
  Aspirant
  Jul 31, 2018
  Still having the issues. It does not seem to be on the devices that are wired but often those that are wireless. We have the follwoing Orbi mesh system in a 4000 sq foot home.
  
  Orbi Cable Modem: CBR40 (This device is in router mode)
  
  Orbi Satellite: RBS20 connected wirelessly to the CBR40
  
  Orbi Router: RBR50 (This device is in bridge mode) connected via ethernet to the CBR40
  
  Orbi Satellite: RBS50 connected wirelessly to the RBR50
  
  Per Netgear's support tech, I have binded the RBR50 (after putting it in bridge mode) to the the CBR40. I have additionally reserved the oast octet x.x.x.21 to my iPhone to test it. I'm still at my original issue:
  
  Here's the issue: The CBR is routing traffic / supping DHCP address to about 30-35 devices within our home. When devices leave the network such as iPhones, or devices fall asleep such as Macs, when they attempt to get reconnect via WiFi, they have issues negotiating an address. Upon looking at the DHCP table, the devices are "active" and did not fall off the list. Inspecting the DHCP serving page, I do not see a lease time available? Is anyone else having issues. This does not happen to hard wired devices, only WiFi devices and they are not happening to just one iOS device it is all devices running iOS11.x, and I'm an app developer so I'm running iOS Dev 12.
  - vkdelta
    NETGEAR Employee Retired
    Jul 31, 2018
    Is your SSID for CBK40 and RBK50 system same?
    
    Since they are two distinct system, they will not operate in same "mesh domain" (for the lack better terminology) and it might be creating problems.
    
    CBR40 is the primary DHCP server in the network. Although it might be aware of L3 information from devices, it wont have information about L2/L1 (roaming, wifi, etc) and it will would treat them as wired devices coming off RBR50.
    
    One suggestion is to:
    
    Make a network with CBR40, RBS20 and RBS50 and sync them together (Remove any RBR50 off the network)
FURRYe38
Guru
Jul 31, 2018
Does the CBK40 system work with out the RBR50 system being connected and turned ON? Just the cable gatway and 1 or 2 satellites connected to the CBR40?

Whats the size of your home? SqFt?
FURRYe38
Guru
Aug 06, 2018
Are you using any custom DNS addresses ON the CBR40? Or letting it auto detect DNS from the ISP?

I use the following and have no DNS issues:

1.1.1.1 and 9.9.9.9

Yes the DNS that will appear on each connected device will be the routers IP address. NG doesn't support disabling of DNS relay so this is always ON.

Yes you can use the CBR in bridge modem mode. This should disable the wireless MESH and DHCP on the CBR40 and turn it into a modem only device. I haven't tryied this yet.

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Orbi Cable Modem DHCP Issues