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527968d433
IPv6 RA always contains an implicit default route via the link-local address of the source of RA. This forces the guest to install a route via isolated network, which may disturb the guest's networking in case of multiple interfaces. More info in 013427e6e733f7a662f4e8a9c11f7dad4cd65e3f. The validity of this route is controlled by "default [route] lifetime" field of RA. If the lifetime is set to 0 seconds, then no route is installed by receiver. dnsmasq 2.67+ supports "ra-param=<interface>,<RA interval>,<default lifetime>" option. We pass "ra-param=*,0,0" (here, RA_interval=0 means default) to disable default gateway in RA for isolated networks.