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archerious
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Duplicate Address Detected IPv6?

Wed May 20, 2020 3:51 am

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.

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RB4011 Former: UDM-Pro, CCR2004, hEX, ER4
USW-24-Poe, USW Aggregation Switch, and Cisco Catalyst 1000-24P-4X-L Former: Ubiquiti XG-16 & ES-10X
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troykelly
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Re: Duplicate Address Detected IPv6?

Mon Jun 01, 2020 9:08 am

@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.
 
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jprietove
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Re: Duplicate Address Detected IPv6?  [SOLVED]

Mon Jun 01, 2020 2:46 pm

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
 
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archerious
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Re: Duplicate Address Detected IPv6?

Mon Jun 15, 2020 4:57 pm

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!
RB4011 Former: UDM-Pro, CCR2004, hEX, ER4
USW-24-Poe, USW Aggregation Switch, and Cisco Catalyst 1000-24P-4X-L Former: Ubiquiti XG-16 & ES-10X
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Re: Duplicate Address Detected IPv6?

Wed Nov 25, 2020 11:49 am

> 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
ip address show
. 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.

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