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

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