On mar. 11 févr. 18:27:43 2020, Joakim Tjernlund wrote: > On Tue, 2020-02-11 at 18:18 +0100, Alarig Le Lay wrote: > > CAUTION: This email originated from outside of the organization. Do > > not click links or open attachments unless you recognize the sender > > and know the content is safe. > > > > > > Hi, > > > > On mar. 11 févr. 17:52:29 2020, Bastien Durel wrote: > > > 7: wg4b: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 state UNKNOWN qlen 1000 > > > inet6 fe80::3/128 scope link > > > valid_lft forever preferred_lft forever > > > 8: wg4a: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 state UNKNOWN qlen 1000 > > > inet6 fe80::3/128 scope link > > > valid_lft forever preferred_lft forever > > > > Don’t put fe80 addresses by hand and definitely not with /128, let your > > kernel handles this. > > I always wondered why not /128 ? In IPV4 they are just fine.
Because OSPF uses multicast. In IPv4 the route is implicitly on all interfaces. With IPv6, it’s the link-local. So if your address is /128 no route is added, and multicast can’t work. -- Alarig
