[Solved] How to prevent a docker container to get a IPv6?

[Schicksal]

Hi, sorry for all those strange questions.

I had a problem to get IPv6 to a docker container (Plex for external use).

Now after many trial an error it's done! 

But now every container uses ipv6. 

One special container shouldn't get one. SABnzbd+vpn. I think it is obvious why this container shouldn't get a global IPv6.

Perhaps it is possible to block by using custom and not host or bridge?

If i put in only a IPv4 it get a IPv6 automatically.

Is there a command for blocking it? Put in a IPv4, and then a command or something like that?

 

Edited September 14, 2020 by Schicksal

[testdasi]

I don't think you need ipv6 for the docker. Your public ipv6 is for things to go to your router. The port mapping from your router to Plex docker doesn't need ipv6.

[Schicksal]

Sorry but does it mean docker doesn’t need IPv6 support and I could mapp a port from unraid itself (which have a global IPv6) to the Plex dock to get external access? That would make things easier.
I need IPv6 because I only have global IPv6, no IPv4.

[testdasi]

1 hour ago, Schicksal said:

Sorry but does it mean docker doesn’t need IPv6 support and I could mapp a port from unraid itself (which have a global IPv6) to the Plex dock to get external access? That would make things easier.
I need IPv6 because I only have global IPv6, no IPv4.

Yep. For local networking, IPv6 is a liability (e.g. VPN leaks) and much harder to deal with (e.g. 192.168.0.1 is a lot easier to remember than blablabla:blablabla:blablabla:blablabla).

 

And in terms of port-forwarding, it depends on your router but it's pretty normal to have Internet <--- IPv6 ---> router <--- IPv4 ---> docker. Internet-router and router-device are 2 independent networks.

 

Edited August 25, 2020 by testdasi

[Schicksal]

In my opinion it is not possible to route an external IPv6 call on Port 32400 for example to an internal IPv4 Port 32400.
Am I wrong?

[testdasi]

6 minutes ago, Schicksal said:

In my opinion it is not possible to route an external IPv6 call on Port 32400 for example to an internal IPv4 Port 32400.
Am I wrong?

Why not? What does it say in the port-forwarding config page of your router?

 

 

[Schicksal]

This is the current status:

My router has a global IPv6

1. picture

 

My Tower "P...." has a global IPv6

2. picture

 

And I'm using the global IPv6 of the Tower to connect to Port 32400 for Plex.

 

Do I unsterstand it correctly?

- I disable the docker ability for IPv6

- the Plex container get a fixed IPv4 (custom...blah for example 10.0.0.11)

- I put a portforwarding on 10.0.0.11 for port 32400

- I connect from external to the IPv6 of my router with port 32400?

 

or I put the Plex container to bridge(?) or host(?) and I configure a portforwarding to 10.0.0.10 (IPv4 of my tower)?

 

PS: sorry, i don't know how to put the pictures on the right place.

[Ronhj]

For me i use the unraid ip and port 32400 in router settings

 

Need to port it to the internal 32400 aswell, You can try change external port on plex to somthing else personaly i changed to 50000 on mine. Since i had problems connecting to my plex when i had it on 32400

 

 

 

 

 

 

 

 

 

 

[Schicksal]

Oh, i'll try that. I thought the machines need a IPv6 if I want to talk to them from external.

 

PS: and your Plex container is on which networksetting? host or bridge? It's still difficult for me.

Edited August 25, 2020 by Schicksal

[Ronhj]

Oh, i'll try that. I thought the machines need a IPv6 if I want to talk to them from external.

Example.

Sent fra min SM-G965F via Tapatalk

[Ronhj]

 

Its on host.

192.168.80.154 is unraid server

32400 is plex internal port

50000 is external (same as set inside plex settings - remote access, 32400 by deffault)

 

 

Sent fra min SM-G965F via Tapatalk

 

 

 

 

 

 

 

 

 

 

 

[Schicksal]

thanks a lot testdasi and Ronhj. i'll try this.

i thoght i "only" need to learn about linux and this docker stuff.

the most time in the last weeks i read and learned so many things about network 

 

——edit——

 

Nope. Not working like this with my hardware.

I think the AVM Fritzbox cannot translate from IPv6 to IPv4. It feels like only working with IPv6 Ports to IPv6 Ports and IPv4 Ports to IPv4 Ports.

It’s only working with an IPv6 on the unraidserver.

So I still need to block some containers to get a IPv6 address.

 

 

-------edit----------

this worked for me, if some interested in:

--sysctl net.ipv6.conf.all.disable_ipv6=1

Edited September 14, 2020 by Schicksal