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herger
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Posts: 49
Joined: Tue Aug 18, 2020 2:48 pm

IPv6 Link Local Address on IPIPv6 tunnel

Wed Dec 29, 2021 4:00 pm

Hi,
i recently ran into a problem with OSPFv3 over an IPIPv6 tunnel, as the 'tiks on both ends assign themselves the same LL address (fe80::fcfd:ff:fe00:0/64) and OSPF (or ipv6 in general) doesn't like duplicate addresses. The same config was running fine on ROSv6 and is still running fine, if the other end of the ipipv6 tunnel is a non 'tik.
Is there a way to change the LL address on the IPIPv6 tunnel interface? Or rather, why are both 'tiks using the same LL in the first place?

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herger
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Posts: 49
Joined: Tue Aug 18, 2020 2:48 pm

Re: IPv6 Link Local Address on IPIPv6 tunnel

Wed Dec 29, 2021 4:53 pm

Ok, i've reproduced the same behavior on a different set of 'tiks and the LL address always gets set to fe80::fcfd:ff:fe00:0.
It would be very interesting if anyone of you is able to create a IPIPv6 tunnel with a different LL.

#[SUP-70226]
 
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smyers119
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Re: IPv6 Link Local Address on IPIPv6 tunnel

Thu Dec 30, 2021 1:19 am

when you see a ff:fe, that means that it's EUI64 generated from mac. Since this is a layer 3 tunnel it doesn't appear a mac address is generated
(I checked by creating a tunnel and using /interface/print)

Though it is creating the ipv6 address based off this mac FE:FD:00:00:00:00 (if my math is correct)

Just weird
nomacipipv6.png
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