[BUG] MT6000 - Full Cone NAT not working after reboot

Routers
24

Sorry, could you please clarify this part one more?

Then you need to check whether the public IP is on the router Flint2 or on the ISP Modem, or the public IP is still on the upper-level network device of the ISP modem, the ISP modem may be obtained a CGNAT IP.

25

The public IP is on the router

asddsa
asddsa581×925 99.9 KB

26

Hello,

I built a turnserver locally to test the Full cone situation, it depends on coturn, and server IP is 192.168.166.1.

The topology is Turnserver - MT6000 - PC

Test with NATTypeTester, when Full Cone NAT of MT6000 is enabled:

Bruce_2025-10-17_17-47-17
Bruce_2025-10-17_17-47-171292×958 42.5 KB

When Full Cone NAT of MT6000 is disabled:

Bruce_2025-10-17_17-48-08
Bruce_2025-10-17_17-48-081298×934 41.9 KB

The above test results are in line with expectations, the Full Cone NAT works well.

  1. Is this public IP 190.134.223.77 your MT6000 WAN IP?
  2. In your test topology, is there a layer of routing between MT6000 and PC?
  3. Please try installing a plugin upnp, opkg update && opkg install upnp, and enable it in Luci:
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28

With the other servers it works, but with 192.168.1.1 it still says udpblocked.

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2501×522 13.5 KB

1
1507×530 22.5 KB

29

Hello,

The first 2 STUN Server addresses are private addresses, which means you have to build and host a own turnserver on your Flint2 WAN side, only that you can test like my previous reply.

The last 2 are public network turnserver. The test results show that your Flint2's Full Cone NAT has taken effect and is working normally.

1 Like