On Mon, Jul 28, 2025, 02:38 Claudio Jeker <cje...@diehard.n-r-g.com> wrote:
> On Sun, Jul 27, 2025 at 11:51:25PM +0200, Omar Polo wrote: > > Florian Obser <flor...@openbsd.org> wrote: > > > RFC 4291 2.1: > > > All interfaces are required to have at least one Link-Local unicast > > > address > > > > thanks for the pointer! Now my question becomes how to add such address > > to a wg(4) device however. > > > > I've tried with a (dumb, but here's all i know) `inet6 autoconf' on the > > wg device, as well as trying to add an address inside fe80::/10 manually > > (inet6 fe80:fdd0::1/64 with or without alias, in hostname.if) to no > > avail. > > > > I mean: > > # ifconfig wg3 create > > # ifconfig wg3 inet6 autoconf > > # ifconfig wg3 > > wg3: > flags=2480c3<UP,BROADCAST,RUNNING,NOARP,MULTICAST,AUTOCONF6TEMP,AUTOCONF6> > mtu 1420 > > index 14 priority 0 llprio 3 > > wgport 32884 > > groups: wg > > > > but if I s/wg3/tap0 I get a fe80::something/64 address on it. > > > > > > > With that in mind, read in6_ifattach() and weep. > > > > ouch! > > wg(4) does not repsect any RFC and especially for IPv6 it is very > opinionated. It does not do link local addresses and also does not do > autoconfiguration or neighbor discovery. > > -- > :wq Claudio > You can definitely manually add a link-local address; I normally use them for routing. I have also run OSPF and BGP over wg (on OpenBSD and Linux). I usually explicitly allow the multicast ranges along with any others. It's always worked fine, no gre needed. I may only have done OSPFv4 with OpenBSD though. I currently do both with Linux. Server: Ifconfig wg0 fe80::100 Client: Ifconfig wg0 fe80::101 Ping6 fe80::101%wg0 Works fine. True enough about autoconf and ND though. Sorry about the formatting; never can figure that out on a phone. >
