2Degrees static IPv6 setup on Asus

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udmada

10 posts

Wannabe Geek
+1 received by user: 3

#309331 9-Oct-2023 13:20

Hi all

I've been trying to enable ipv6 address in macvlan and host network for my docker running on a Synology NAS.

Enabling ipv6 for docker itself seems quite straightforward, however the subnetting ipv6 addresses is something I have no clue of. (Even at work I try not to touch anything network-y in k8s)

I have read the following articles:

- [x] Ubiquiti Edgerouter Tutorial

- [x] 2 Degrees Broadband, ipv6 and UniFi Security Gateway

- [x] [IPv6] How to set up IPv6 in ASUS Router?

I have got a static IP addresses (believe both v4 and v6) from 2Degrees. Say I received 2404:4400:41fd:6400::/56 from the ISP, am I doing the right thing here:

Supposedly, I am trying to achieve what I was advised from one of the comments here:

Say you received this prefix from 2D: 2404:4400:41fd:6400::/56, you can use any /64s between 2404:4400:41fd:6400::/64 and 2404:4400:41fd:64ff::/64.

So your router LAN address can be, for example 2404:4400:41fd:6401::ffff/64,

your DHCPv6 range can be 2404:4400:41fd:6401::1000/64 to 2404:4400:41fd:6401::1fff/64

and your servers could use 2404:4400:41fd:6401::1/64, 2404:4400:41fd:6401::2/64, 2404:4400:41fd:6401::3/64, ...

Easy to manage and easier to type... 😄

Just make sure you take notes of which addresses you are already using to avoid conflicts.

nzkc

1588 posts

Uber Geek
+1 received by user: 995

#3144570 9-Oct-2023 13:37

In the router configuration, you select DHCP (auto assigned or whatever its called). You'll just be assigned the same IP address/IPv6 subnet each time.

You do not configure it as static in the router.

udmada

10 posts

Wannabe Geek
+1 received by user: 3

#3144592 9-Oct-2023 14:47

I understand what you were saying, and I believe this is the solution provided by ASUS themselves: https://www.asus.com/support/FAQ/113990/

I guess the complexity here is that I need to specify a CIDR (fixed-cidr-v6) for Docker to assign a subnet to the default bridge network, enabling dynamic IPv6 address allocation, as per Docker documentation: https://docs.docker.com/config/daemon/ipv6/#use-ipv6-for-the-default-bridge-network. And I need a static ipv6 address for one of my docker container to work properly

And I believe because 2Degrees gives non-standard /56 ipv6 blocks, my router or the docker daemon wouldn't be able to automatically get the /64 needed. Hence I was trying to assign static ipv6 blocks at my router level.

nzkc

1588 posts

Uber Geek
+1 received by user: 995

#3144654 9-Oct-2023 16:10

udmada:

And I believe because 2Degrees gives non-standard /56 ipv6 blocks, my router or the docker daemon wouldn't be able to automatically get the /64 needed. Hence I was trying to assign static ipv6 blocks at my router level.

Its not non standard. Its reasonably common for a /56 to be allocated to a residential address.

You can then carve up that subnet however you like (you get 256 /64 ranges in a /56). Im not running an Asus router anymore, however, IIRC my clients all got a /64 address (the first one in the /56 range as it happens).

You can allocate _another_ /64 range if you like and reserve that yourself for docker. You'll probably want to allocate a manual IP address from that range to the docker host. Not in place of the IPv6 address it gets from your router but to accompany it.