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Why has IPv6 mngtmpaddr stopped responding?


Diskless Boot with IPv6Get dynamic and static IPv6 addressFirewall problem using autofs with NFS-exported mountsIPv6 not working for Ubuntu in AWS EC2 instances






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19.04



I have been using IPv6 on my LAN for a few weeks now. Ping, SSH, NFS -- all fine. Three 19.04 machines, all good.



Yesterday, after an update, the IPv6 stopped working. Processing a request to an IPv6 address on the LAN the system hangs. I say 'after an update' because I did do an update and some hours later I noticed the problem; so I'm not saying the update caused it, just noting the coincidence.



I had been using the mngtmpaddr address as reported by the ip a command. On a try I switched to using the other IPv6 address (the /128 address) and now that one works.



This is not only a curiousity. There's an issue for me because I have been using my NFS server's IPv6 address to mount its shares when I'm away from the LAN. Previously I had to change my /etc/fstab whenever I was away from home. So :
So what is going on?



  1. What is the difference between these two addresses?

  2. Why would the mngtmpaddr stop working?

  3. Will this change still work from outside the LAN?









share|improve this question

































    0


















    19.04



    I have been using IPv6 on my LAN for a few weeks now. Ping, SSH, NFS -- all fine. Three 19.04 machines, all good.



    Yesterday, after an update, the IPv6 stopped working. Processing a request to an IPv6 address on the LAN the system hangs. I say 'after an update' because I did do an update and some hours later I noticed the problem; so I'm not saying the update caused it, just noting the coincidence.



    I had been using the mngtmpaddr address as reported by the ip a command. On a try I switched to using the other IPv6 address (the /128 address) and now that one works.



    This is not only a curiousity. There's an issue for me because I have been using my NFS server's IPv6 address to mount its shares when I'm away from the LAN. Previously I had to change my /etc/fstab whenever I was away from home. So :
    So what is going on?



    1. What is the difference between these two addresses?

    2. Why would the mngtmpaddr stop working?

    3. Will this change still work from outside the LAN?









    share|improve this question





























      0













      0









      0








      19.04



      I have been using IPv6 on my LAN for a few weeks now. Ping, SSH, NFS -- all fine. Three 19.04 machines, all good.



      Yesterday, after an update, the IPv6 stopped working. Processing a request to an IPv6 address on the LAN the system hangs. I say 'after an update' because I did do an update and some hours later I noticed the problem; so I'm not saying the update caused it, just noting the coincidence.



      I had been using the mngtmpaddr address as reported by the ip a command. On a try I switched to using the other IPv6 address (the /128 address) and now that one works.



      This is not only a curiousity. There's an issue for me because I have been using my NFS server's IPv6 address to mount its shares when I'm away from the LAN. Previously I had to change my /etc/fstab whenever I was away from home. So :
      So what is going on?



      1. What is the difference between these two addresses?

      2. Why would the mngtmpaddr stop working?

      3. Will this change still work from outside the LAN?









      share|improve this question
















      19.04



      I have been using IPv6 on my LAN for a few weeks now. Ping, SSH, NFS -- all fine. Three 19.04 machines, all good.



      Yesterday, after an update, the IPv6 stopped working. Processing a request to an IPv6 address on the LAN the system hangs. I say 'after an update' because I did do an update and some hours later I noticed the problem; so I'm not saying the update caused it, just noting the coincidence.



      I had been using the mngtmpaddr address as reported by the ip a command. On a try I switched to using the other IPv6 address (the /128 address) and now that one works.



      This is not only a curiousity. There's an issue for me because I have been using my NFS server's IPv6 address to mount its shares when I'm away from the LAN. Previously I had to change my /etc/fstab whenever I was away from home. So :
      So what is going on?



      1. What is the difference between these two addresses?

      2. Why would the mngtmpaddr stop working?

      3. Will this change still work from outside the LAN?






      ssh nfs ipv6






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Sep 11 at 20:32







      Stephen Boston

















      asked Sep 9 at 23:08









      Stephen BostonStephen Boston

      1,8433 gold badges11 silver badges24 bronze badges




      1,8433 gold badges11 silver badges24 bronze badges























          1 Answer
          1






          active

          oldest

          votes


















          0



















          After some research I see that the IPv6 addresses expire -- unless assigned otherwise. This default is, I believe, to protect the privacy of clients. This concern however is at odds with the requirement that servers have a consistent address.



          So that's why the IPv6 addresses stopped working.



          To acquire a 'static' - permanent - IPv6 I have added a IPv6 address to the netplan configuration.



           renderer: networkd
          wifis:
          wlp3s0:
          dhcp4: yes -- set through DHCP reservation
          dhcp6: no
          addresses: [10.0.0.120/24,"-:-:-:-::-/128"]


          Where I took the IPv6 address from the current dynamically assigned IPv6 address, and the gateway from the default route of the ip -6 r command. (I found I had to reboot the machine to apply. A simple netplan apply or networking restart did not suffice.)



          This assigns a forever lifetime to the IPv6 address and creates another temporary IPv6.



          One of my three machines (all fully updated 19.04) resists creating a forever lifetime. I have fixed this with



          ip a change <device IPv6 address> dev <device id> preferred_lft forever





          share|improve this answer





























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            0



















            After some research I see that the IPv6 addresses expire -- unless assigned otherwise. This default is, I believe, to protect the privacy of clients. This concern however is at odds with the requirement that servers have a consistent address.



            So that's why the IPv6 addresses stopped working.



            To acquire a 'static' - permanent - IPv6 I have added a IPv6 address to the netplan configuration.



             renderer: networkd
            wifis:
            wlp3s0:
            dhcp4: yes -- set through DHCP reservation
            dhcp6: no
            addresses: [10.0.0.120/24,"-:-:-:-::-/128"]


            Where I took the IPv6 address from the current dynamically assigned IPv6 address, and the gateway from the default route of the ip -6 r command. (I found I had to reboot the machine to apply. A simple netplan apply or networking restart did not suffice.)



            This assigns a forever lifetime to the IPv6 address and creates another temporary IPv6.



            One of my three machines (all fully updated 19.04) resists creating a forever lifetime. I have fixed this with



            ip a change <device IPv6 address> dev <device id> preferred_lft forever





            share|improve this answer
































              0



















              After some research I see that the IPv6 addresses expire -- unless assigned otherwise. This default is, I believe, to protect the privacy of clients. This concern however is at odds with the requirement that servers have a consistent address.



              So that's why the IPv6 addresses stopped working.



              To acquire a 'static' - permanent - IPv6 I have added a IPv6 address to the netplan configuration.



               renderer: networkd
              wifis:
              wlp3s0:
              dhcp4: yes -- set through DHCP reservation
              dhcp6: no
              addresses: [10.0.0.120/24,"-:-:-:-::-/128"]


              Where I took the IPv6 address from the current dynamically assigned IPv6 address, and the gateway from the default route of the ip -6 r command. (I found I had to reboot the machine to apply. A simple netplan apply or networking restart did not suffice.)



              This assigns a forever lifetime to the IPv6 address and creates another temporary IPv6.



              One of my three machines (all fully updated 19.04) resists creating a forever lifetime. I have fixed this with



              ip a change <device IPv6 address> dev <device id> preferred_lft forever





              share|improve this answer






























                0















                0











                0









                After some research I see that the IPv6 addresses expire -- unless assigned otherwise. This default is, I believe, to protect the privacy of clients. This concern however is at odds with the requirement that servers have a consistent address.



                So that's why the IPv6 addresses stopped working.



                To acquire a 'static' - permanent - IPv6 I have added a IPv6 address to the netplan configuration.



                 renderer: networkd
                wifis:
                wlp3s0:
                dhcp4: yes -- set through DHCP reservation
                dhcp6: no
                addresses: [10.0.0.120/24,"-:-:-:-::-/128"]


                Where I took the IPv6 address from the current dynamically assigned IPv6 address, and the gateway from the default route of the ip -6 r command. (I found I had to reboot the machine to apply. A simple netplan apply or networking restart did not suffice.)



                This assigns a forever lifetime to the IPv6 address and creates another temporary IPv6.



                One of my three machines (all fully updated 19.04) resists creating a forever lifetime. I have fixed this with



                ip a change <device IPv6 address> dev <device id> preferred_lft forever





                share|improve this answer
















                After some research I see that the IPv6 addresses expire -- unless assigned otherwise. This default is, I believe, to protect the privacy of clients. This concern however is at odds with the requirement that servers have a consistent address.



                So that's why the IPv6 addresses stopped working.



                To acquire a 'static' - permanent - IPv6 I have added a IPv6 address to the netplan configuration.



                 renderer: networkd
                wifis:
                wlp3s0:
                dhcp4: yes -- set through DHCP reservation
                dhcp6: no
                addresses: [10.0.0.120/24,"-:-:-:-::-/128"]


                Where I took the IPv6 address from the current dynamically assigned IPv6 address, and the gateway from the default route of the ip -6 r command. (I found I had to reboot the machine to apply. A simple netplan apply or networking restart did not suffice.)



                This assigns a forever lifetime to the IPv6 address and creates another temporary IPv6.



                One of my three machines (all fully updated 19.04) resists creating a forever lifetime. I have fixed this with



                ip a change <device IPv6 address> dev <device id> preferred_lft forever






                share|improve this answer















                share|improve this answer




                share|improve this answer








                edited Sep 29 at 15:04

























                answered Sep 10 at 23:55









                Stephen BostonStephen Boston

                1,8433 gold badges11 silver badges24 bronze badges




                1,8433 gold badges11 silver badges24 bronze badges































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