Darac Marjal <mailingl...@darac.org.uk> wrote: > On Wed, Mar 25, 2015 at 01:49:31AM +0000, Michael Graham wrote:
>> I've been trying to understand what I should do about my current IPv6 >> wows. >> >> I have an IPv6 enabled network but when on a clean boot I don't get an >> IPv6 address (in Jessie BTW), I've tracked this down to this message in >> dmeg: >> >> IPv6: wlan0: IPv6 duplicate address fe80::fef8:aeff:fe7b:115f detected! > This is the link-local address for the device with a MAC address of > FC:F8:AE:xx:xx:7B:11:5F (where xx:xx is obscured by the IP address). MAC addresses are only 6 bytes big. The FF:FE is merely inserted into the middle and the 1st bit of the first byte of the MAC is flipped to generate the host part of the IPv6 address. > So, perhaps the DAD is correct and there is another device on your > network trying for the same address (note that the address space of > autoconfigured link-local addresses is smaller than that of MAC > addresses - due to the FF:FE in the middle - so there IS a slim chance > of a valid collision). No, there is not chance of a collision. If DAD thinks there is another device with the same address (and hence MAC) then there _is_ another device with the same address or another anomaly (network loop, like you already wrote). Using a sniffer to clearly see, what is going on would also be my next step in diagnosing this. Grüße, Sven. -- Sigmentation fault. Core dumped. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/sbg0le0ro...@mids.svenhartge.de
