Re: [Qemu-devel] IPv6 support for -net user?

[Stefan Hajnoczi]

On Wed, Aug 29, 2012 at 04:43:18PM +0700, Ivan Shmakov wrote:
>       I'm writing an iPXE mini-HOWTO (in Russian), using QEMU and
>       -net user in examples (so that they're runnable by unprivileged
>       users.)
> 
>       However, the QEMU documentation [1] seems to suggest that only
>       IPv4 is implemented for -net user, which made me curious on
>       whether the IPv6 support is planned to be added anytime soon?
> 
>       Personally, I'm interested mostly in QEMU sending router
>       (prefix) advertisements to the “guest”, and forwarding TCP and
>       UDP traffic, although support for recursive DNS discovery and
>       DHCPv6 may also be nice to have.

Jan Kiszka is the -net user maintainer, I have CCed him.

I'm not aware of work to add IPv6 support to slirp.  Someone would have
to step up and submit patches :).

You can still do unprivileged IPv6 networking with external DHCPv6, etc
software:

  $ qemu -netdev socket,id=socket0,listen=127.0.0.1:1234 \
         -device virtio-net-pci,netdev=socket0

The socket netdev tunnels traffic over a TCP or UDP socket.  For TCP it
prefixes each packet with the big-endian uint32_t length.  For UDP no
length header is necessary because packet boundaries are preserved.

You could write your own code or find something that can speak with
QEMU's -netdev socket.

Stefan