Forum Discussion
Switch VoIP configuration
I posted a question about configuring switches for VoIP. Please see below. I followed the instructions on the NetGear PDF.
https://community.netgear.com/t5/Smart-Plus-Click-Switches/LLDP-for-VoIP-phones-help/td-p/1760257
I called Netgear to double check, and the person I was speaking with recommended not to use Auto-VoIP. So which one is correct? This is my topology. I'll have a VoIP router besides my LAN router. On the back of the phones, there are two switch ports. One going to the wall jack for VLAN 5 (Voice), and then cables goes from "PC" port on the phone to computers.
All the examples looks like the PDF from Netgear, so I'm confusused to why the Netgear support told me not to use Auto-VoIP
There is no right or wrong.
With VoIP phones (configured tagged for a specific VoiceVLAN) and a data passthrough (commonly untagged) it might be easier having static config.
You are free to try and test - it's a few clicks, so why bother? Or do some manager expect going live the same hour the same day? You need to build on your own experience, and should be free to run some testing, too.
7 Replies
Please identify the model number of this router and the Internet Service Provider (ISP) equipment that it is connected to.
If the WAN IP address is a 'private' IP address, then the router is not connected directly to the ISP network. For example, the ISP may have installed a WiFi router (which has the public IP address) and your router is connected to it.
There are many web sites that will report the public IP address, such as https://whatismyipaddress.com
Lots of information without much for us to work with.
What router do you have?
What modem/gateway is it connected to?
Who's your ISP?
What streaming service and app/device are you using?
Who's telling you its a private vs public IP address issue? And why?
How do I find the public IP address for my router? The IP in the Nighthawk app for External IP Address is a private IP and not a public IP.
Either you are double-routing (connecting your WAN port to a gateway, and not a modem), or your internet service provider is using Carrier-Grade NAT (CGNAT) or equivalent.
- Can you provide the manufacturer/model of the device your router's WAN port is connected to?
- Who is your ISP?
Hi, thanks for the replies! I have a Netgear R6260 router that is connected to a DZS modem . I talked to my ISP (Global Net) and the IP in the External IP Address on the NightHawk app is correct. That is the private IP address that is part of the cgnet I am on. That traffic does route to their public IP address for the internet. They have not made any changes to their IPs.
Sling TV is thinking I am on a VPN as they are showing my IP address as 0.0.0.0. This started last Thursday, July 31st. I plugged my laptop directly into my modem, disabled wireless and I can successfully access Sling when the router is not a part of the connection. As soon as I switch back to wireless and connect to the router instead of the modem, Sling is no longer accessible. Sling is broken on Firestick TV, Apple iPhone and iPad as well as my Dell laptop. I checked sling on my parents wireless when I was a their house and can successfully access it. I've had Sling for several years and never had an issue. Was there a Netgear update last Thursday that changed something with my IP address?
The IP address for Netgear, 192.168.1.1 is marked as private on IP address websites. I am guessing Sling may be pulling this IP address from my router and hence thinking I am on a VPN? Thanks for any answers!
I talked to my ISP (Global Net) and the IP in the External IP Address on the NightHawk app is correct.
If that is a private address then they must be using CGNAT.
Is 192.168.1.1 the external address you are seeing for the router? Or is it the internal address?
I plugged my laptop directly into my modem, disabled wireless and I can successfully access Sling when the router is not a part of the connection
Then the CGNAT must not be the problem. If it were, then it would also fail when connected to the modem.
Sling TV is thinking I am on a VPN as they are showing my IP address as 0.0.0.0.
Where are you seeing this info?
Was there a Netgear update last Thursday
I don't have your router. The current firmware (version 1.1.1.88) is timestamped 2025-01-21 (so not that recent).
Did you try simply rebooting the router?
Thanks for the reply. The Nighthawk app is showing 192.168.1.1 as the IP Address (internal) and the External IP Address is 100.80.1.109 (This is the private IP my ISP confirmed is correct). I have tried rebooting the router and I have also unplugged the modem for a couple of minutes, two times. Nothing changes on the IP addresses.
Sling indicated that they are seeing my IP address as 0.0.0.0. I cannot see where they are seeing this, that is what they told me. I am not sure if it is in my Sling account as I cannot log into when using the router due to Sling seeing my IP address as 0.0.0.0. I may try to log in later when I can connect directly to the modem with wireless disabled.
the External IP Address is 100.80.1.109
FWIW, that is in the address space reserved for carrier-grade NAT.
But if the problem was caused by CGNAT, then it should also fail when you are directly connected to the modem.
Might be worth confirming that you can access Sling on your phone with the phone connected to mobile data (not wifi). I suspect that will work.
Another test is to temporarily put your laptop in the DMZ of your router, and see if that works. That would let us know if the NAT firewall in the router is somehow getting in the way.
Do you have parental controls enabled in the router?
100.80.1.109 is not a "private IP address":
https://en.wikipedia.org/wiki/Private_network
I do not seem able to find out much about this IP address:
100.80.1.109 is not a "private IP address":
The address is in the 100.64.0.0/10 block. Technically not "private", but not "public" either. Instead it is "shared" within each ISP. See https://en.wikipedia.org/wiki/IPv4_shared_address_space
The address block is specfically reserved for CGNAT (as your bottom screenshot suggests). It was carved out in 2012, when the IETF adopted RFC6598. This was one of several measures taken in that timeframe to manage IPv4 address exhaustion.
Like private addresses, these are not internet routable, because all ISPs deploying CGNAT are re-using the same addresses. This is analogous to private addresses being re-used by all home routers. They are of course routable within each ISP, just like private addresses are routable within your home network.
Really appreciate everyone's help on this. I am not sure what happened but I am now able to access Sling TV on all devices. Checked the IPs in the Nighthawk app and nothing changed. I didn't change any other settings (I do not have parental control set anywhere). I am not sure what changed - maybe that router reboot I did again yesterday just took some time to set everything back to normal? I don't know, this is a mystery to me! Thanks again for everyone's help on this!
but I am now able to access Sling TV on all devices
Great!
I am not sure what changed - maybe that router reboot I did again yesterday just took some time to set everything back to normal?
0r maybe something changed at Sling's end (or perhaps some other problem with the infrastructure between you and their servers).
Great point, you could be spot on there. Thanks again!
