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Should I disable 6to4 or dynamic updates ? RRS feed

  • Question

  • Hi,

    In Windows 2012 R2 ( provides DHCP and DNS ).

    I recently started to have ipv4 records of Windows 7 workstations disappearing in my DNS server.

    I notice that only ipv6 record stay, while associated ipv4 records gets deleted shortly after.

    I have DNS server settings set to always "dynamically update DNS records" + "discard A and PRT records.." + DNS credential + dnsupdateproxy group

    I was able to resolve issues by disabling 6to4 on some existing workstations.. This appears to related to

    https://support.microsoft.com/en-us/help/2782438/-a-record-gets-deleted-when-aaaa-record-gets-registered

    Client deletes its A record when the client dynamically updates the AAAA record that also includes an A record update with TTL=0, this happens if DHCP option 81 set by DHCP server

    I understand that 6to4 is something very standard on windows, so I'm not sure why I have to disable 6to4 on any new machine I'm adding to my domain.

    I understand also that in my setup, DHCP server always update records on behalf of Client, so they shouldn't need to do dynamic updates.. ( https://technet.microsoft.com/en-us/library/cc959284.aspx )


    => should I still disable 6to4 on all machine by gpo ?

    or

    => should I disably dns dynamic update on all machine by gpo ?

    thanks

    francois

    Tuesday, August 15, 2017 4:25 PM

All replies

  • Hi,

    6to4 is an Internet transition mechanism for migrating from Internet Protocol version 4 (IPv4) to version 6 (IPv6), a system that allows IPv6 packets to be transmitted over an IPv4 network (generally the IPv4 Internet) without the need to configure explicit tunnels.

    >> should I still disable 6to4 on all machine by gpo ?

    Yes,if you don't have ipv6 production environment.

    > >should I disably dns dynamic update on all machine by gpo ?

    No, dns dynamic update is a system that addresses the problem of rapid updates.

    Best Regards,

    Frank


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    Wednesday, August 16, 2017 7:59 AM
  • but dns updates are handled by the DHCP server
    Wednesday, August 16, 2017 9:54 AM