Am 16.05.2013 10:59, schrieb Jouke Witteveen: > On Thu, May 9, 2013 at 11:53 PM, Thomas Bächler <[email protected]> wrote: >> Am 09.05.2013 23:29, schrieb Thomas Bächler: >>> When switching networks in auto.action, the addresses are not flushed. This >>> is especially problematic with stateless ipv6 autoconfigutation, as invalid >>> IPs may stay around until their (potentially very long) lifetime has >>> expired. >>> >>> bring_interface_down is always called after ip_unset everywhere else, so >>> this change does not affect anything else. >> >> This may not be a good idea, since it probably flushes the link-local >> address. I must test more. >> > > It does indeed flush the link-local address too. > When are link-local addresses added and why is it bad to flush them?
They are added on interface creation (or maybe when bringing the interface down/up) by the kernel. Without a link-local address, lots of IPv6 functionality simply fails - it is permanently assigned to the interface and never changes (you probably can change it, but I don't see the point, unless you want to hide your MAC address somehow). Best idea is to simply flush addresses in site, global and host scope as I stated before. This flushed all ipv6 addresses except link-local, and all ipv4 addresses.
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