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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?
- What is the difference between these two addresses?
- Why would the
mngtmpaddrstop working? - Will this change still work from outside the LAN?
ssh nfs ipv6
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
add a comment
|
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?
- What is the difference between these two addresses?
- Why would the
mngtmpaddrstop working? - Will this change still work from outside the LAN?
ssh nfs ipv6
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
add a comment
|
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?
- What is the difference between these two addresses?
- Why would the
mngtmpaddrstop working? - Will this change still work from outside the LAN?
ssh nfs ipv6
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
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?
- What is the difference between these two addresses?
- Why would the
mngtmpaddrstop working? - Will this change still work from outside the LAN?
ssh nfs ipv6
ssh nfs ipv6
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
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
asked Sep 9 at 23:08
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
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
add a comment
|
add a comment
|
1 Answer
1
active
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votes
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
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
add a comment
|
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1 Answer
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1 Answer
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oldest
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votes
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
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
add a comment
|
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
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
add a comment
|
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
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
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
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
edited Sep 29 at 15:04
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
answered Sep 10 at 23:55
Stephen BostonStephen Boston
1,8433 gold badges11 silver badges24 bronze badges
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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