IPv6 routing between AppVMs

[marmarek]

Reported by joanna on 24 Feb 2013 15:33 UTC
None

Migrated-From: https://wiki.qubes-os.org/ticket/718

[marmarek]

Modified by joanna on 1 Aug 2013 11:52 UTC

[marmarek]

Comment by marmarek on 9 Oct 2014 02:07 UTC
It looks like starting with 3.13 Linux kernel supports NAT for IPv6, so (theoretically) we can use the same scheme as for IPv4.

[marmarek]

Comment by joanna on 9 Oct 2014 21:32 UTC
I might not be up to date with all this networking stuff, but I thought the point of ipv6 was to actually not use NATing...?

[marmarek]

Comment by marmarek on 9 Oct 2014 21:53 UTC
Generally yes (and I'm surprised that NAT support comes to ip6tables), but for our network scheme it is beneficial to use NAT, instead of routing. For example inter-VM connections can be configured independent of external IP address.

[marmarek]

Comment by marmarek on 20 Jan 2015 03:43 UTC
I've done some testing and it looks straightforward to support IPv6 in our VMs (using NAT). All required changes are in core-agent-linux repo, in scripts which are almost the same in R2 and R3. Additionally it is easy to make it opt-in feature (using qvm-service framework). So I propose to move this task to R2.

The only potentially problematic thing is qubes-firewall (per-VM firewall rules). Currently user can set rules based on IP(v4) or name. In case of an IPv4 rule, obviously it is not applicable to IPv6 firewall. In case of a name, it can be - if that name resolves to IPv6 address. But if not - ip6tables will fail loading such rule.
The simplest solution would be to modify qubes-firewall script (which loads that rules in firewallvm) to filter-out rules not applicable to IPv6. In most common use of non-empty firewall (default policy DROP) this shouldn't harm - at worst some traffic will be filtered (so application would fall back to IPv4).

In the future we might introduce more advanced firewall configuration, with option to set IPv4 and IPv6 rules explicitly.

[marmarek]

@woju I think we forgot about this one when implementing "NetVM" in Qubes 4.0...

[ghost]

I'm a little bit disappointed now. I was looking forward to setup and use Qubes OS. Finally with a new machine I did this today using Qubes OS 3.2 rc 2.

I struggled a bit with networking (so my hope is I'm doing something wrong) but finally I got it working. But I did not get an IPv6 assigned (This works properly in my network).

So to be clear: This really means as of today there is no IPv6 in Quebes and for the future you are looking to NAT it ?

I would be happy to "turn" off all firewall features of Qubes OS since I got this covered by an rather extensive network setup. Is this an option ?

[marmarek]

On Fri, Aug 12, 2016 at 03:30:41PM -0700, iggs0 wrote:

So to be clear: This really means as of today there is no IPv6 in Quebes and for the future you are looking to NAT it ?

Yes.

I would be happy to "turn" off all firewall features of Qubes OS since I got this covered by an rather extensive network setup. Is this an option ?

It depends what you call "all firewall features". You don't need to use
outbound traffic limiting ("Firewall" tab in VM settings). You can even
disable "qubes-firewall" service in Proxy VMs (which will really do
nothing anyway if you don't fill "Firewall" tab in VM settings).

But you can't disable NAT. This is rather unavoidable(*) with tree-like
structure of network connections between VMs (sys-net -> sys-firewall ->
AppVMs, possibly sys-whonix in between).

(*) without modifying every routing table in your LAN.

Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

[marmarek]

Script mentioned above: marmarek/qubes-core-agent-linux@789eb51

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