Is it possible to access Asus Router via IPv6 from WAN?

[sanke1]

With Dynamic or Static IPv4, it's extremely easy to access Router homepage via DDNS or direct IPv4.

Since my ISP has CG-NAT on IPv4 and static IPv6, can I type Asus Router's IPv6 and login? I need this to use WOL feature on Router's GUI.

Does Asus Router get assigned any IPv6 at all?

A 2018 thread concluded it was not possible back then. @ASUSWRT_2020 is this a feature we can request?

 

[drabisan]

CG-NAT or DSLite, call it however you want, it started as an enabler for IPv6 deployments and it's used as an cover for so much of the crap deployments.
Not tight enough specs allowed for so many variations and often it's impossible to predict the behavior. It relies too much on what provider chooses to implement.
Most times you won't get inbound IPv4 connectivity. Unfortunately sometimes you won't get even IPv6 inbound connectivity.
Although it was updated by rfc7335, rfc6333 have set a trend and now we're unable to move on from it.

Runt off.

It's impossible to say if you can access your Asus over IPv6. It does work when there's a clean IPv6 deployment and you're allowing access from WAN. Not really recommended to do that, but if you want to do it, it works.
But while behind a DSLite, you're at the mercy of ISP's implementation. And you cannot control that.
Ideally you should have a way to move away from DSLite. Call your ISP and ask to be out of DSLite.

 

[toaruScar]

Does Asus Router get assigned any IPv6 at all?

It does if your ISP supports it. You can check for the assigned IPv6 address by SSH into your router and use ifconfig to check for if a global IPv6 address is assigned to the WAN NIC (called ppp0 if you use PPPoE).

 

[sanke1]

It does if your ISP supports it. You can check for the assigned IPv6 address by SSH into your router and use ifconfig to check for if a global IPv6 address is assigned to the WAN NIC (called ppp0 if you use PPPoE).

admin@RT-AX88U-0240:/tmp/home/root# ifconfig
br0       Link encap:Ethernet  HWaddr A8:5E:45:AA:92:41
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::aa5e:45ff:fead:240%lo/64 Scope:Link
          inet6 addr: 2403:e390:3b8e:29::1%1/64 Scope:Global
          UP BROADCAST RUNNING ALLMULTI MULTICAST  MTU:1500  Metric:1
          RX packets:108200 errors:0 dropped:0 overruns:0 frame:0
          TX packets:520222 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:20400942 (19.4 MiB)  TX bytes:709594488 (676.7 MiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:10.153.113.178  P-t-P:10.153.96.1  Mask:255.255.255.255
          inet6 addr: fe80::7555:5484:2d9:eb51%lo/10 Scope:Link
          UP POINTOPOINT RUNNING MULTICAST  MTU:1492  Metric:1
          RX packets:537398 errors:0 dropped:0 overruns:0 frame:0
          TX packets:107583 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:703160340 (670.5 MiB)  TX bytes:15544831 (14.8 MiB)

inet6 addr: 2403:e390:3b8e:29::1%1/64 is not a valid address to access my RT-AX88U directly.
ppp0 doesn't have WAN IPv6.

 

[toaruScar]

inet6 addr: 2403:e390:3b8e:29::1%1/64 is not a valid address to access my RT-AX88U directly.

It seems that your ISP delegats a block of IPv6 addresses to your router, so the router allows LAN-side devices to have IPv6 public addresses. But the ISP did not give your router's ppp0 an IPv6 address. And I think ASUSWRT do not serve webpage to "outside" IPs (IP outside of its LAN CIDR) on its LAN facing NIC.
A very simple workaround is just to run a proxy server on one of your LAN devices. From there you can access your router's webGUI.