Hi, I was assigned a public IP address from my ISP and when configuring it to my router I keep receiving the Invalid IP message.I checked it and I accurately made all the settings as indicated by my ISP. The IP class is xxx.yyy.zzz.kkk/31My ISP says that the issue is on the router since they think it doesn't support the RFC 3021. Can it be that a new router like the RBR20 with the latest firmware installed (V2.6.2.104) doesn't support the class /31 and RFC 3021? Thank your

Hi rbussolotti Welcome to NETGEAR Community! This is interesting. Please allow me to check this with the team and we'll get back to you. Regards, Blanca Community Team

What subnet mask has been entered for this static IP address? (255.255.255.254)?Typically the gateway address is in the same subnet as the static IP address.A /31 IP address allows for only two hosts in the subnet. (device and gateway)..It had never occured to me to wonder how ISP's would assign static IP's. This implies that for every static IP they assign, they burn another IP address from their pool for the gateway.Learn something every day.

Hi,Thanks for answering.Yes the settings are as follows:IP: xxx.yyy.zzz.67Subnet Mask: 255.255.255.254 (as foreseen in the point/point connections following RFC 3021 specificatiins - https://tools.ietf.org/html/rfc3021)Gateway: xxx.yyy.zzz.66DNS Primario: 8.8.8.8DNS Secondario: 1.1.1.1Any suggestion?Thank you

I am guessing that this Orbi is past the 90 days of "complimentary support"?It's ironic that the upper levels of ISP tech support almost certainly have direct links to the major modem and router manufacturers. Surely Netgear supports an RFC from 20 years ago.Reading the RFC, my first impression was that the IP's are "backward", i.e. the local host should be 66 and the network end 67.But, that defies common sense. They provide static IP's all the time. When does the "Invalid IP" error message come up? Does it provide any information besides "Invalid"?

Hi, you're more than right on the 90 days.No other indication given. The precise message is "192.168.1.1 says Invalid IP" and I get it when I click "Save" after inserting all the parameters. Thank you

Invalid IP - RBR20 | NETGEAR Communities

14 Replies

CrimpOn
Guru - Experienced User
Feb 22, 2021
What subnet mask has been entered for this static IP address? (255.255.255.254)?
Typically the gateway address is in the same subnet as the static IP address.
A /31 IP address allows for only two hosts in the subnet. (device and gateway)..It had never occured to me to wonder how ISP's would assign static IP's. This implies that for every static IP they assign, they burn another IP address from their pool for the gateway.
Learn something every day.
- rbussolotti
  Aspirant
  Feb 22, 2021
  Hi,
  Thanks for answering.
  Yes the settings are as follows:
  
  IP: xxx.yyy.zzz.67
  Subnet Mask: 255.255.255.254 (as foreseen in the point/point connections following RFC 3021 specificatiins - https://tools.ietf.org/html/rfc3021)
  Gateway: xxx.yyy.zzz.66
  DNS Primario: 8.8.8.8
  DNS Secondario: 1.1.1.1
  
  Any suggestion?
  Thank you
  - CrimpOn
    Guru - Experienced User
    Feb 22, 2021
    I am guessing that this Orbi is past the 90 days of "complimentary support"?
    It's ironic that the upper levels of ISP tech support almost certainly have direct links to the major modem and router manufacturers.
    
    Surely Netgear supports an RFC from 20 years ago.
    Reading the RFC, my first impression was that the IP's are "backward", i.e. the local host should be 66 and the network end 67.
    But, that defies common sense. They provide static IP's all the time.
    
    When does the "Invalid IP" error message come up? Does it provide any information besides "Invalid"?
Blanca_O
NETGEAR Employee Retired
Mar 01, 2021
Hi rbussolotti

Welcome to NETGEAR Community!

This is interesting. Please allow me to check this with the team and we'll get back to you.

Regards,
Blanca
Community Team
- rbussolotti
  Aspirant
  Mar 22, 2021
  Hi Bianca,
  
  I was wondering if you heard any news from the team.
  
  Thanks a million
  r
- rbussolotti
  Aspirant
  May 13, 2021
  Bianca have you heard anything from the team. This issue is anything quite odd.
  Thanks

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Invalid IP - RBR20