Hannes Frederic Sowa <[email protected]> writes: > On Sat, Jul 9, 2016, at 23:13, Bjørn Mork wrote: >> The Juniper SSL VPN client use a "tun" interface and seems to >> be picky about visible changes.to it. Commit cc9da6cc4f56 >> ("ipv6: addrconf: use stable address generator for ARPHRD_NONE") >> made such interfaces get an auto-generated IPv6 link local address >> by default, similar to most other interface types. This made the >> Juniper SSL VPN client fail for unknown reasons. >> >> Fixing this regression by effectively reverting the behaviour to >> what we had before, while keeping the new "addrgenmode random" >> feature. > > I wonder if we can simply add a flag, something like > IFF_SUPPRESS_AUTO_IPV6_LL, to net_device->priv_flags and use that. So we > can keep behavior for qmi, vxlan-gpe and gre. tun is the only device > that is really user space facing, so maybe we just limit it to this?
Sounds good to me, but I don't know if the use case really qualifies as "* You should have a pretty good reason to be extending these flags." The automatic address is certainly nice to have, but "good reason"? I don't know... We can always just configure those devices for automatic LL addresses using "ip link set foo addrgen random" or similar. Bjørn
