# Full Cone NAT not works on PPPoE **URL:** \ **Category:** Router\ **Created:** [December 22, 2023, 7:02pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404 "2023-12-22T19:02:10Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![raphamotta](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/858c86/32.png) [@raphamotta](https://forum.gl-inet.com/u/raphamotta)\ **Post date:** [December 22, 2023, 7:02pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/1 "2023-12-22T19:02:10Z")
Just to informa and create a topic about it. Tested Full cone NAT with GL-MT6000 and GL-MT3000. Both works fine on DHCP but don’t on PPPoE. Tested with Nintendo Switch with gives a NAT type “A” when full cone NAT is working. I even connected MT6000 as PPPoE and MT3000 WAN to MT6000 LAN (DHCP) and full cone nat on MT3000 works (and of course, in MT6000 don’t works). ---
**Author:** ![raphamotta](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/858c86/32.png) [@raphamotta](https://forum.gl-inet.com/u/raphamotta)\ **Post date:** [January 2, 2024, 10:28pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/2 "2024-01-02T22:28:56Z")
just trying to figure out how to activate fullconenat on PPPoE but no success so far. I’m thinking to try with valina openwrt (or x-wrt, immortal) to see if works ---
**Author:** ![alzhao](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/5f9b8f/32.png) [@alzhao](https://forum.gl-inet.com/u/alzhao)\ **Post date:** [January 3, 2024, 2:38am UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/3 "2024-01-03T02:38:16Z")
When using pppoe, does the ISP network has firewall? ---
**Author:** ![admon](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/admon/32/32880_2.png) [@admon](https://forum.gl-inet.com/u/admon)\ **Post date:** [January 3, 2024, 12:16pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/4 "2024-01-03T12:16:03Z")
I can confirm that Full NAT does not work while using PPPoE. Same issue here on my Flint2 with a Telekom VDSL connection (so no CG NAT) ---
**Author:** ![raphamotta](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/858c86/32.png) [@raphamotta](https://forum.gl-inet.com/u/raphamotta)\ **Post date:** [January 3, 2024, 12:44pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/5 "2024-01-03T12:44:28Z")
I just checked and in bridge mode, my ISP modem has the firewall disabled. DHPC mode works fine (put the router in DMZ). Also as I said in the 1st post, I also connected MT6000 as PPPoE and MT3000 WAN to MT6000 LAN (DHCP - DMZ) and full cone nat on MT3000 works (and of course, in MT6000 don’t works). So no ISP problem. ---
**Author:** ![japa182](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/j/43a26b/32.png) [@japa182](https://forum.gl-inet.com/u/japa182)\ **Post date:** [January 3, 2024, 1:42pm UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/6 "2024-01-03T13:42:43Z")
as a suggestion, the version of immortalwrt and x-wrt works correctly, but both do not use iptables but nftables, this could be the cause of the problem… ---
**Author:** ![bruce](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bruce/32/35649_2.png) [@bruce](https://forum.gl-inet.com/u/bruce)\ **Post date:** [October 29, 2025, 4:29am UTC](https://forum.gl-inet.com/t/full-cone-nat-not-works-on-pppoe/36404/7 "2025-10-29T04:29:00Z")