China Telecom & NAT WRT1900ac

Installing and Using OpenWrt Network and Wireless Configuration
#1

I have been trying to connect to my Synology Diskstation via a remote connection (VPN, WebDAV etc) for months and nothing has worked. Someone on Reddit said that my LAN IP should match my IP that is displayed when I use https://whatismyipaddress.com/. It doesn't match, so that probably means China Telecom are using a NAT. Does anyone have any experience with fixing this issue?

Any help would be much appreciated.

#2

You need at least one globally routed IPv4 or IPv6.
Check from the router to be sure:

ip address show

The reserved ranges:
https://en.wikipedia.org/wiki/Reserved_IP_addresses

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#3

someone on Reddit was almost right.

you should be looking at the WAN IP.

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#4

WAN IP doesn't appear to be a thing on this router?See here

#5

Sorry, I don't know what any of that means? How do I check?

#6

WAN is always a "thing", unless you run it as a access point.

Are you running openwrt on your device ?

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#7
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#8

@jonbennsion, welcome to the community!

  1. You don't have to make a reply to each person in series, we can all see.
  2. I don't know why you showed us a Google search page - and the extra code in the search is concerning
  3. We know there is a WAN IP, otherwise it isn't a router
  4. Please confirm you're running OpenWrt

You go to whatismyip.com and verify your WAN IP matches, as we've noted to you.

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#9

Seems, illogically, the WAN IP is shown on the troubleshooting page.

https://community.linksys.com/t5/Wireless-Routers/WRT1900ac-router-WAN-IP/td-p/827276

But, if you find it there, you're not running openwrt.

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#10

The reason I included the google link was because it seems my router does not have a WAN address displayed anywhere in the admin page. I am not running openwrt.

#12

Please find the appropriate support forum for the manufacturer of your hardware/firmware. This forum is for OpenWrt support.

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#13

My Public IPv4 address that I looked up using whatismyip, does not match what is shown in the troubleshooting section of the router admin page.

#14

then you're probably NATed.

There are ways to get around it, but it might cost you some money, unless you've got a buddy with a public IP :wink:

You might consider switching to openwrt, but it'll not solve the problem at hand.

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#15

If your ISP's modem is on "routing mode", you should switch it to "bridge mode", which is necessary (but not sufficient) if you want a public IP on router's WAN.

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#16

Most likely it's CGNAT in play here.

Essentially you'll need a global routable IP to make your internal service available over the internet. Be it native IPv6(China Telecom enables this in some areas), or in IPv4 world solutions like VPN/ngrok etc.

#17

It was a NAT. They have now given me a public IP address that has allowed me to access using WebDAV. Thanks for the help!

#18

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