On Wed, Mar 25, 2015 at 10:57:46AM +0100, Sven Hartge wrote: > Darac Marjal <mailinglist@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. Oh, yes. Whoops :) > > > 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-REQUEST@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org > Archive: [🔎] sbg0le0rodv8@mids.svenhartge.de">https://lists.debian.org/[🔎] sbg0le0rodv8@mids.svenhartge.de >
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