On Wed, Sep 16, 2015 at 03:38:22PM +0100, Stuart Henderson wrote: > On 2015/09/16 09:39, David Hill wrote: > > So I need to attach an IP somewhere. Both the FreeBSD and NetBSD in the > > u6rd manpage say I need an IPv6 address on tun0. > > > > NetBSD 5.1 > > # ifconfig tun0 create > > # ifconfig tun0 inet6 2001:db8:cb00:7101::1/32 > > This works if you put it into tap mode (ifconfig tun0 link0) but that > is probably not what your application needs. > > Same if you remove the /32 prefix. > > Interestingly doing the same on gif or gre does work. >
Setting link0 sets IFF_MULTICAST. The main difference between Free and OpenBSD is that tun(4) interfaces are created with IFF_MULTICAST with FBSD : if_tun.c from FreeBSD (line 380) : ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; IPv6 requires multicast :) Denis
