On 02.10.2015 15:21, Martin Pieuchot wrote: > On 02/10/15(Fri) 12:53, Stuart Henderson wrote: >> [...] >> I think it would probably make sense to remove an autoconfigured >> prefix/address if an interface goes down (and one could argue for this >> being the right thing to do for IPv4/DHCP as well - I lost count of >> the number of times I have to manually remove addresses so I can >> continue to reach my home subnet after I've unplugged the laptop). > > This makes sense and should work for LCP keepalive as well. But I > don't know how hard would it be to teach dhclient(8) to do that... >
That makes perfect sense to me too. But does an ifconfig down really does not remove autoconfigured IPv6 addresses? I can't test it as ifconfig pppoe0 down does not seem to work as expected at all (but that's another issue). At least another interface (em) with a DHCP configured IPv4 address will have that address removed once it goes down (using ifconfig down). I think (with my limited knowledge of how it actually works :)) the PPPoE issue won't be solved like that as unplugging the cable or loosing the PPPoE connection won't make the interface go down. I think PPPoE should sort of "reset" it's interface (removing all IPv6 autoconfigured addresses) once a connection is lost. And contrary to DHCP/SLAAC, PPPoE actually has the possibility built-in to detect that (using ECHOREQ and ECHOREP). -- Unix _IS_ user friendly - it's just selective about who its friends are!
