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[2530] Ipv6 address lost after some time

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  • 1.  [2530] Ipv6 address lost after some time

    Posted Jun 20, 2020 06:57 AM

    My device has the problem, that it lost the static ipv6 managment address after some time. So that it can only reached via ipv4. Then I can only reboot the switch, because readding it, will fails with:

    vlan XX ipv6 address XXX/48 
XXX/48: Inconsistent value.

    And this will logged when it happens:

    I 06/20/20 11:31:57 04908 ntp: The system clock time was changed by 0 sec
            39306905 nsec.	 The new time is Sat Jun 20 11:31:57 2020
.
I 06/20/20 11:31:57 04910 ntp: All the NTP server associations reset.
W 06/20/20 11:39:02 00026 ip: Managment: ip address XXXXX/48
            removed from vlan XXX
I 06/20/20 12:32:02 04908 ntp: The system clock time was changed by 0 sec
            65092530 nsec.	 The new time is Sat Jun 20 12:32:02 2020
.
I 06/20/20 12:32:02 04910 ntp: All the NTP server associations reset.

     OS: YA.16.10.0007

     

    Have anyone an idea, what goes wrong?

    Thanks.



  • 2.  RE: [2530] Ipv6 address lost after some time
    Best Answer

    Posted Jun 21, 2020 04:39 AM

    Hi @all,

    after some test it looks like the device will only accept /64'er ipv6 addresses. After change the mask and reboot it, it will not lost the address any more. After that I have retest it with the /48'er mask to verify it. And than the same will happens again. So back to an /64'er mask.



  • 3.  RE: [2530] Ipv6 address lost after some time

    EMPLOYEE
    Posted Jun 22, 2020 08:47 AM

    IPv6 is pretty much standardized to /64 subnets assigned to interfaces/VLANs only. You might receive a /48 (or /56) from your provider, to be distributed in /64s inside your network.

     

    You indeed should not deviate from that /64 unless you have a very good reason or like to get into trouble.