[libvirt] [PATCHv2 0/2] disable default gateway in IPv6 RA for isolated networks

[Maxim Nestratov]

On 01.07.2016 14:50, Maxim Perevedentsev wrote:

> In case of DHCPv6 in isolated network, we start dnsmasq
> which sends Router Advertisements (RA). If RA containts no gateway
> then the link-local address of the source of RA is considered
> a gateway (and guest installs a corresponding default route).
>
> If a guest has two network interfaces (public and isolated network)
> and the user installs a default route through "public" interface,
> the guest will have something like
>
> default via fe80::ffff:1:1 dev eth2  metric 1024
> default via fe80::5054:ff:fe0a:d808 dev eth3  proto ra  metric 1024  expires 1789sec
>
> RA route metric may vary, and it is preferred.
> The validity of default route is controlled by
> "default [route] lifetime" field in RA. If it is 0, then
> the default gateway announced is considered invalid,
> and no default route is installed into guest.
>
> dnsmasq 2.67+ supports "ra-param=<interface>,<RA interval>,<default lifetime>"
> option. We can pass "ra-param=*,0,0" (here, RA_interval=0 means default)
> to disable default gateway in RA.
>
> This patchset adds detection for "ra-param" in dnsmasq and
> sets "ra-param=*,0,0" for isolated network if dnsmasq supports it.
>
> Maxim Perevedentsev (2):
>    Fix message about dnsmasq BINDTODEVICE capability.
>    dnsmasq: disable IPv6 default gateway in RA for isolated networks
>
>   src/network/bridge_driver.c | 7 +++++++
>   src/util/virdnsmasq.c       | 8 ++++++--
>   src/util/virdnsmasq.h       | 1 +
>   3 files changed, 14 insertions(+), 2 deletions(-)
>
> --
> 1.8.3.1
>
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Pushed now. Thanks!

Maxim