Fedora IPv6 testing and improvements - request for ideas

Zach Villers zachvatwork at gmail.com
Thu Oct 29 19:45:20 UTC 2015

If it helps, Sixxs (https://www.sixxs.net/main/) is a very highly
recommended tunnel broker. I have not tried it and am not affiliated. I do
have ipv6 capability from my isp, so could help with testing.

On Thu, Oct 29, 2015 at 3:35 PM, Peter Robinson <pbrobinson at gmail.com>

> On Thu, Oct 29, 2015 at 3:15 PM, Pavel Simerda <psimerda at redhat.com>
> wrote:
> > Hi all,
> >
> > I am writing to Fedora development mailing lists to get opinions
> > and ideas regarding our project on improving IPv6 support in
> > Fedora across its components.
> >
> > https://fedoraproject.org/wiki/QA/Networking
> In the above page:
> * Network configuration: I see NetworkManager in there but nothing
> about systemd-networkd
> * Other: firewalld including zones and other such configurations (you
> mention iptables)
> > Most prominent subpages:
> >
> >  * https://fedoraproject.org/wiki/QA/Networking/Test_environment
> In this section I see "IPv6 node" but nothing that covers a IPv6 only
> routed network with IPv6 to IPv4 gateway ie it runs v6 only internally
> but uses 6 to 4 services for legacy services.
> >  * https://fedoraproject.org/wiki/QA/Networking/Client_software
> Again nothing about a native IPv6 only network with a gateway that
> supports 6to4 for legacy services outside the network.
> What about a iOS9 style preferring of IPv6 over IPv4 in the general
> desktop. In the iOS9 case they do network measurements and favour IPv6
> bydefault, and if it's going to be faster but fail back quickly if
> it's not, how would we deal with this?
> >  * https://fedoraproject.org/wiki/QA/Networking/Server_software
> Nothing in here about:
> * IPv6 services RA, dhcp6, 6 to 4 proxies, 4 to 6 proxies and other
> such transition servers
> * what about VPN services like a IPv6 only network connecting to a
> dual stack VPN, or a IPv4 only VPN or a number of combinations there
> of IE interfaces that are v6 only and ones that are v4 only. What
> happens with routing then if there's other 6 to 4 services in play?
> * Load balancers ie like facebook uses to bridge external dual stack
> to IPv6 only internal services, or providing IPv6 externally to
> present internal v4 services externally to v6
> There's also nothing I can see from a quick read about offload
> engines. A lot of 10Gb+ network interfaces have offloads for generic
> IP, TCP, other acceleration to enable to do line speed 10+gb on IPv4,
> we obviously want acceleration because IPv6 headers are larger and
> hence take up more memory. There's toolkits like dpgk (
> http://dpdk.org ) for acceleration of packets across large bandwidth
> interfaces but I don't see any mention of that or network IO
> virtualisation/offload.
> Facebook and others have been testing these sorts of things:
> https://code.facebook.com/posts/1123882380960538/linux-ipv6-improvement-routing-cache-on-demand/
> https://code.facebook.com/posts/938078729581886/improving-the-linux-kernel-with-upstream-contributions/
> Along these lines also I see nothing about Open vSwitch and SND
> encapsulation protocols testing such as vxlan, GRE, GENEVE etc
> > During the first phase we are interested in getting feedback on
> > testing methods and test cases. Any other ideas are of course
> > welcome. Even contacts for future collaboration would be great.
> A future development would be around 6LoWPAN and the routing protocols
> etc for that so we can communicate with IoT devices.
> The way I read a lot of the pages above is a "this is how we did it on
> IPv4 lets test it on IPv6" rather than a review of how things are
> going to change with IPv6, how would I get to a IPv4 site if I'm on a
> IPv6 network, visa versa and the whole sets of new use cases that are
> appearing as a result of it.
> Peter
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