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Duplicate Address Detected IPv6?
Posted: Wed May 20, 2020 3:51 am
by archerious
Can someone explain this to me, I found it doesn't go away even if I switch from a /64 on say 1873 to 1875 etc. Randomly it goes away or this issue spreads.
I am about as stupid as it gets to IPv6 on MikroTik, so any help is appreciated.
My ISP gives me a /60 if that helps.
Re: Duplicate Address Detected IPv6?
Posted: Mon Jun 01, 2020 9:08 am
by troykelly
@archerious Did you get any answers on this - it's making our routers unusable.
The fix for (horrific IPv6 issues) on RouterOS was to disable and re-enable all IPv6 addresses at startup - but that doesn't seem to resolve this specific issue.
Re: Duplicate Address Detected IPv6? [SOLVED]
Posted: Mon Jun 01, 2020 2:46 pm
by jprietove
Have you tried to enable 'EUI-64' in address? Maybe another device is trying to use the same address (prefix obtained with all the other bits 0). If you construct your IP address using the prefix + EUI-64 you shouldn't have this problem
Re: Duplicate Address Detected IPv6?
Posted: Mon Jun 15, 2020 4:57 pm
by archerious
Have you tried to enable 'EUI-64' in address? Maybe another device is trying to use the same address (prefix obtained with all the other bits 0). If you construct your IP address using the prefix + EUI-64 you shouldn't have this problem
That fixed it! I don't see any other devices using the exact prefix, but enabling EUI64 resolved it!
Do you have a donation link? This saved me so much, god bless you!
Re: Duplicate Address Detected IPv6?
Posted: Wed Nov 25, 2020 11:49 am
by WGH
> Maybe another device is trying to use the same address (prefix obtained with all the other bits 0)
It happens very easily on Linux network stack. If Linux considers itself a router (which is the same as having "forwarding" enabled), it will claim the all-zeros address,
EDIT: even though it will never explicitly appear in
. If you have VMs, Docker containers, etc., you will automatically have forwarding turned on.
As things are now, trying to suppress this behaviour is an exercise in futility.
Re: Duplicate Address Detected IPv6?
Posted: Tue Sep 28, 2021 11:15 am
by archerious
This issue started happening again sadly.
Re: Duplicate Address Detected IPv6?
Posted: Fri Dec 10, 2021 6:24 pm
by BombardierBeetle
I had the same problem and the v6addr became invalid.
This was confirmed in RB4011 7.1rc6 and 7.1stable.
A temporary workaround was to shutdown all I/F on the router except the WAN, enable/add the address, and then enable the interfaces.
This would allow the v6 address to be used, but once the router rebooted, the address would be disabled again.
I think the problem is that it happens even if I set the "No DAD" option for the address.
Re: Duplicate Address Detected IPv6?
Posted: Wed Mar 15, 2023 11:14 am
by breakaway
I just hit this issue on an RB750gr3 running v7.8
@jprietove's fix of enabling eui64 has resolved it.