Forum Discussion

firefox111's avatar
firefox111
Network Novice
Hace 3 años

Cudy AC1200 Cellular Modem/Router with WiFi

Hello.  I purchased this Cudy AC1200 Router/Modem and got an Internet-only prepaid plan with TM. However, I can't do services that can be had with a normal Internet connection from cable or DSL! The Modem/Router is capable of setting up DDNS, an L2TP VPN server, etc., but none of that is working!  The DDNS complains because the outside IP address is a "Private" IP.  The L2TP is NOT reachable.  I had set the Modem/Router to respond to ping from WAN but when I ping the "Public" IP addresss that is shown on the Modem/Router status, it does not respond to ping!

 

Why is there two IP addresses shown on the Cellular status field? Example: the Public is 172.58.207.82 then there is an "IP Address" of 172.32.84.244.  AND when I check my IP Address from a whatismyipaddress.com, it gives me 172.58.207.41!!!  Why is that???

 

I was going to use this to replace a cable internet service to my townhouse that I'm going to put in the market.  The cable internet is going to be moved to my son's apartment so I need to have access to my network in the townhouse (cameras, garage door, thermostat) while it is on the market. With these issues, I can't access my LAN from remote!

 

Cellular home internet is totally a different animal!

 

Is there a way to having a straight-forward Internet connection using TM?  Thanks in advance.

  • iTinkeralot's avatar
    iTinkeralot
    Bandwidth Buff
    Hace 3 años

    So you can pretty easily determine if your solution is working through CGNAT. I am pretty sure the answer is yes but in your test solution you can determine this with the steps below.

    1. Open up a web browser.
    2. Tipo What is my IP in the URL bar.
    3. Hit ingresar.
    4. The browser will display your public IP address on top of the screen.
    5. Note down this IP address.
    6. Ahora log into your router’s settings by typing in the router IP in the URL.
    7. Use your username and password to log in.
    8. Navega hasta al Status page.
    9. Here you can check the ISP-assigned WAN IP address.
    10. If both IP addresses are the same, then you are not on CGNAT.
    11. However, if this WAN IP differs from the public IP address, you are behind CGNAT.

    Referencia: https://www.purevpn.com/blog/what-is-cgnat/

  • iTinkeralot's avatar
    iTinkeralot
    Bandwidth Buff
    Hace 3 años

    172.58.207.82 then there is an “IP Address” of 172.32.84.244.  

    If you trace route out from a local client the first few router responses should help clarify the path and IP addressing.

    IP Address from a whatismyipaddress.com, it gives me 172.58.207.41 < WAN IP.

    I can see 172.58.207.41 is from a public class B,  IPv4 address range

    Privado Class B network, 172.16.0.0 – 172.31.255.255 (172.16/12 prefix)

  • firefox111's avatar
    firefox111
    Network Novice
    Hace 3 años

    So I am on CGNAT.  Looking at the second paragraph on my original post:
    Public: 172.58.207.82
    IP Address: 172.32.84.244
    whatismyipaddress.com: 172.168.207.41

    The Public and whatismyipaddress.com addresses are not the same.

    As I have stated, I am able to gain access to the inside LAN via the Windows 10 desktop with Team Viewer.  This setup will be implemented on Monday, October 24, at location.  I'm currently 1,800 miles away in my Laboratory.