postfix refused to run ipv6? opensuse tumbleweed

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Re: postfix refused to run ipv6? opensuse tumbleweed

Carlos E. R.-2
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On Friday, 2018-01-19 at 13:55 +0100, Per Jessen wrote:

> Carlos E. R. wrote:
>> On 2018-01-19 13:28, Per Jessen wrote:
>>> Carlos E. R. wrote:
>>>> On 2018-01-19 13:16, Per Jessen wrote:
>>>>> Carlos E. R. wrote:
>>>>>> On 2018-01-19 13:06, Per Jessen wrote:
>>>>>>> Carlos E. R. wrote:
>>>>>>
>>>>>> ...
>>>>>>
>>>>>>>> I have IPv6 enabled on the computer and I have no issues with
>>>>>>>> it. In "/etc/gai.conf" I changed:
>>>>>>>>
>>>>>>>> precedence ::ffff:0:0/96  100
>>>>>>>>
>>>>>>>> which makes the system to prefer IPv4, I understand.
>>>>>>>
>>>>>>> Yes, that is what the comments say.  When you don't have ipv6, it
>>>>>>> is unnecessary to change it though.
>>>>>>
>>>>>> I found sometimes that zypper would try to use IPv6 and error out.
>>>>>> Since I did that edit, no more problems :-)
>>>>>
>>>>> ISTR that being due to a faulty/partially working ipv6 setup on
>>>>> your side.
>>>>
>>>> Obviously! My router doesn't have IPv6 to Internet.
>>>
>>> No, that is not obvious, Carlos - if you don't have _any_ ipv6 setup,
>>> your setup is not faulty nor partial.  In that case, no need to
>>> edit /etc/gai.conf.  Otherwise we would be shipping a very poor
>>> default.
>>
>> But it should be obvious to you, I have commented with you that my
>> router doesn't have IPv6 connectivity :-)
>
> In which case there is no need to amend /etc/gai.conf.  That's all I'm
> saying.  As I said, ISTR going through this a couple years back and
> discovering you had a partial or faulty IPv6 setup.

But I do need it. I have problems without doing that change.

- --
Cheers,
        Carlos E. R.
        (from openSUSE 42.2 x86_64 "Malachite" at Telcontar)

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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
Carlos E. R. wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>
>
> On Friday, 2018-01-19 at 13:55 +0100, Per Jessen wrote:
>> Carlos E. R. wrote:
>>> On 2018-01-19 13:28, Per Jessen wrote:
>>>> Carlos E. R. wrote:
>>>>> On 2018-01-19 13:16, Per Jessen wrote:
>>>>>> Carlos E. R. wrote:
>>>>>>> On 2018-01-19 13:06, Per Jessen wrote:
>>>>>>>> Carlos E. R. wrote:
>>>>>>>
>>>>>>> ...
>>>>>>>
>>>>>>>>> I have IPv6 enabled on the computer and I have no issues with
>>>>>>>>> it. In "/etc/gai.conf" I changed:
>>>>>>>>>
>>>>>>>>> precedence ::ffff:0:0/96  100
>>>>>>>>>
>>>>>>>>> which makes the system to prefer IPv4, I understand.
>>>>>>>>
>>>>>>>> Yes, that is what the comments say.  When you don't have ipv6,
>>>>>>>> it is unnecessary to change it though.
>>>>>>>
>>>>>>> I found sometimes that zypper would try to use IPv6 and error
>>>>>>> out. Since I did that edit, no more problems :-)
>>>>>>
>>>>>> ISTR that being due to a faulty/partially working ipv6 setup on
>>>>>> your side.
>>>>>
>>>>> Obviously! My router doesn't have IPv6 to Internet.
>>>>
>>>> No, that is not obvious, Carlos - if you don't have _any_ ipv6
>>>> setup,
>>>> your setup is not faulty nor partial.  In that case, no need to
>>>> edit /etc/gai.conf.  Otherwise we would be shipping a very poor
>>>> default.
>>>
>>> But it should be obvious to you, I have commented with you that my
>>> router doesn't have IPv6 connectivity :-)
>>
>> In which case there is no need to amend /etc/gai.conf.  That's all
>> I'm saying.  As I said, ISTR going through this a couple years back
>> and discovering you had a partial or faulty IPv6 setup.
>
> But I do need it. I have problems without doing that change.

Well, there is something not quite right with your setup then. I'm sure
we've been over this before.  Something about your router "pretending"
it has IPv6, but with no ipv6 uplink.  

Yes, the thread is here:
https://lists.opensuse.org/opensuse/2015-10/msg00235.html

long thread, you might have to go back and forth a bit.



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Re: postfix refused to run ipv6? opensuse tumbleweed

Werner Flamme-2
In reply to this post by Simon Becherer
Am 18.01.2018 um 18:04 schrieb Simon Becherer:
> Hi,
>
> i recognized at the moment, that
> my postfix seems not to run since 11 11 2017
> could this be ipv6 related?
>
> "...... interface found for ::1 "
>
> maybe i have there switched off ipv6 via yast?

Here, Postfix has two settings, those are by default:

inet_interfaces = all
inet_protocols = all

You can set them to

inet_interfaces = 127.0.0.1
inet_protocols = ipv4

This way, you bind postfix especially to the ipv4 protocol and the
interface address used by ipv4. It should not matter any more if you
have ipv6 enabled or not on your host.

Detailed information can be found in "man 5 postconf"

HTH, Werner
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Re: postfix refused to run ipv6? opensuse tumbleweed

Carlos E. R.-2
In reply to this post by Per Jessen
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On Saturday, 2018-01-20 at 12:33 +0100, Per Jessen wrote:

> Carlos E. R. wrote:
>> On Friday, 2018-01-19 at 13:55 +0100, Per Jessen wrote:
>>> Carlos E. R. wrote:
>>>> On 2018-01-19 13:28, Per Jessen wrote:
>>>>> Carlos E. R. wrote:
>>>>>> On 2018-01-19 13:16, Per Jessen wrote:
>>>>>>> Carlos E. R. wrote:
>>>>>>>> On 2018-01-19 13:06, Per Jessen wrote:
>>>>>>>>> Carlos E. R. wrote:
>>>>>>>>
>>>>>>>> ...
>>>>>>>>
>>>>>>>>>> I have IPv6 enabled on the computer and I have no issues with
>>>>>>>>>> it. In "/etc/gai.conf" I changed:
>>>>>>>>>>
>>>>>>>>>> precedence ::ffff:0:0/96  100
>>>>>>>>>>
>>>>>>>>>> which makes the system to prefer IPv4, I understand.
>>>>>>>>>
>>>>>>>>> Yes, that is what the comments say.  When you don't have ipv6,
>>>>>>>>> it is unnecessary to change it though.
>>>>>>>>
>>>>>>>> I found sometimes that zypper would try to use IPv6 and error
>>>>>>>> out. Since I did that edit, no more problems :-)
>>>>>>>
>>>>>>> ISTR that being due to a faulty/partially working ipv6 setup on
>>>>>>> your side.
>>>>>>
>>>>>> Obviously! My router doesn't have IPv6 to Internet.
>>>>>
>>>>> No, that is not obvious, Carlos - if you don't have _any_ ipv6
>>>>> setup,
>>>>> your setup is not faulty nor partial.  In that case, no need to
>>>>> edit /etc/gai.conf.  Otherwise we would be shipping a very poor
>>>>> default.
>>>>
>>>> But it should be obvious to you, I have commented with you that my
>>>> router doesn't have IPv6 connectivity :-)
>>>
>>> In which case there is no need to amend /etc/gai.conf.  That's all
>>> I'm saying.  As I said, ISTR going through this a couple years back
>>> and discovering you had a partial or faulty IPv6 setup.
>>
>> But I do need it. I have problems without doing that change.
>
> Well, there is something not quite right with your setup then. I'm sure
> we've been over this before.  Something about your router "pretending"
> it has IPv6, but with no ipv6 uplink.
>
> Yes, the thread is here:
> https://lists.opensuse.org/opensuse/2015-10/msg00235.html
>
> long thread, you might have to go back and forth a bit.
Ok, I read it again in full. Yes, that is exactly the case.

The computer has IPv6, has a fixed IPv6 entered manually, and another it
gets automatically, (Scope:Link), related to the MAC:

Telcontar:~ # ifconfig
eth0      Link encap:Ethernet  HWaddr 00:21:85:16:2D:0B      <········
           inet addr:192.168.1.14  Bcast:192.168.1.255  Mask:255.255.255.0
           inet6 addr: fe80::221:85ff:fe16:2d0b/64 Scope:Link <--------
           inet6 addr: fc00::14/64 Scope:Global               <========
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:75909 errors:0 dropped:6 overruns:0 frame:0
           TX packets:62364 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:23320676 (22.2 Mb)  TX bytes:5771448 (5.5 Mb)


The router doesn't have external IPv6, doesn't give IPv6 to machines (yes,
there is another thread with suggestions to try about this, it is in my
ToDo List).

So the computer thinks there is IPv6, but there is not Internet access on IPv6.

This is typical.

Thus I change gai.conf so that it tries IPv4 preferably. And things work :-)


The other solution we spoke on that thread is changing the code of the dns
server so that it doesn't hand out IPv6 responses.



- --
Cheers,
        Carlos E. R.
        (from openSUSE 42.2 x86_64 "Malachite" at Telcontar)

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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
Carlos E. R. wrote:

>> Yes, the thread is here:
>> https://lists.opensuse.org/opensuse/2015-10/msg00235.html
>>
>> long thread, you might have to go back and forth a bit.
>
> Ok, I read it again in full. Yes, that is exactly the case.
>
> The computer has IPv6, has a fixed IPv6 entered manually, and another
> it gets automatically, (Scope:Link), related to the MAC:

Yes, the link-local address is created automagically, derived from the
MAC address.  It is the global address that causes the "problem".

> So the computer thinks there is IPv6, but there is not Internet access
> on IPv6.

That is the problem in a nutshell.  Like I said, a faulty or incomplete
config.

> This is typical.

It is very atypical.  If it were typical, many more people would want to
amend /etc/gai.conf.  

> Thus I change gai.conf so that it tries IPv4 preferably. And things
> work :-)

Yes, it is a reasonable way to work around an incomplete setup, although
I wouldn't want to do it everywhere.  



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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
In reply to this post by Carlos E. R.-2
On 01/20/2018 07:17 AM, Carlos E. R. wrote:

> eth0      Link encap:Ethernet  HWaddr 00:21:85:16:2D:0B      <········
>            inet addr:192.168.1.14  Bcast:192.168.1.255  Mask:255.255.255.0
>            inet6 addr: fe80::221:85ff:fe16:2d0b/64 Scope:Link <--------
>            inet6 addr: fc00::14/64 Scope:Global               <========
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:75909 errors:0 dropped:6 overruns:0 frame:0
>            TX packets:62364 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:23320676 (22.2 Mb)  TX bytes:5771448 (5.5 Mb)
>
>
> The router doesn't have external IPv6, doesn't give IPv6 to machines (yes,
> there is another thread with suggestions to try about this, it is in my
> ToDo List).
>
> So the computer thinks there is IPv6, but there is not Internet access on IPv6.
>

You have a unique local address (starts with fc00:).  Where's it coming
from.


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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
James Knott wrote:

> On 01/20/2018 07:17 AM, Carlos E. R. wrote:
>> eth0      Link encap:Ethernet  HWaddr 00:21:85:16:2D:0B    
>> <········
>>            inet addr:192.168.1.14  Bcast:192.168.1.255
>>            Mask:255.255.255.0 inet6 addr: fe80::221:85ff:fe16:2d0b/64
>>            Scope:Link <--------
>>            inet6 addr: fc00::14/64 Scope:Global              
>>            <========
>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>            RX packets:75909 errors:0 dropped:6 overruns:0 frame:0
>>            TX packets:62364 errors:0 dropped:0 overruns:0 carrier:0
>>            collisions:0 txqueuelen:1000
>>            RX bytes:23320676 (22.2 Mb)  TX bytes:5771448 (5.5 Mb)
>>
>>
>> The router doesn't have external IPv6, doesn't give IPv6 to machines
>> (yes, there is another thread with suggestions to try about this, it
>> is in my ToDo List).
>>
>> So the computer thinks there is IPv6, but there is not Internet
>> access on IPv6.
>>
>
> You have a unique local address (starts with fc00:).  Where's it
> coming from.

Must be a static assignment.



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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
On 01/20/2018 12:30 PM, Per Jessen wrote:
>> You have a unique local address (starts with fc00:).  Where's it
>> > coming from.
> Must be a static assignment.

Not necessarily.  It could be the router is configured to provide a
unique local address.  I have done that here with pfSense.


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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
James Knott wrote:

> On 01/20/2018 12:30 PM, Per Jessen wrote:
>>> You have a unique local address (starts with fc00:).  Where's it
>>> > coming from.
>> Must be a static assignment.
>
> Not necessarily.  It could be the router is configured to provide a
> unique local address.  I have done that here with pfSense.

Wouldn't that show as "dynamic" ?
 

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Re: postfix refused to run ipv6? opensuse tumbleweed

Carlos E. R.-2
In reply to this post by James Knott
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On Saturday, 2018-01-20 at 11:51 -0500, James Knott wrote:
> On 01/20/2018 07:17 AM, Carlos E. R. wrote:

...

>> So the computer thinks there is IPv6, but there is not Internet access on IPv6.
>>
>
> You have a unique local address (starts with fc00:).  Where's it coming
> from.

I said:

|> The computer has IPv6, has a fixed IPv6 entered manually, and another
                           ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
|> it gets automatically, (Scope:Link), related to the MAC:

:-)

Someone here told me to use the fc00: prefix years ago. But I had problems
with zypper before setting that address, IIRC.

- --
Cheers,
        Carlos E. R.
        (from openSUSE 42.2 x86_64 "Malachite" at Telcontar)

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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
In reply to this post by Per Jessen
On 01/20/2018 02:13 PM, Per Jessen wrote:

> James Knott wrote:
>
>> On 01/20/2018 12:30 PM, Per Jessen wrote:
>>>> You have a unique local address (starts with fc00:).  Where's it
>>>>> coming from.
>>> Must be a static assignment.
>> Not necessarily.  It could be the router is configured to provide a
>> unique local address.  I have done that here with pfSense.
> Wouldn't that show as "dynamic" ?
>  
>

No, it just shows as another address.  My computer has both global
addresses and unique local.  Both types are assigned via router
advertisements and show the same link local address for the router.  As
far as the computer is concerned there's no difference, in that both are
routeable.  However, only the global addresses are routeable to the
Internet.

BTW, after my computer has been up for a week, it will have 8 of each
type, in addition to the link local address.




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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
In reply to this post by Carlos E. R.-2
On 01/20/2018 02:33 PM, Carlos E. R. wrote:
> Someone here told me to use the fc00: prefix years ago. But I had problems
> with zypper before setting that address, IIRC.

Those unique local addresses are the IPv6 equivalent of the IPv4 RFC
1918 addresses.  They're routeable, but not over the Internet.  You
could use them for things you don't want to connect directly to the
Internet, such as IoT devices, security cameras etc..  With those, you
would typically have a controller or recorder that is reachable via the
Internet.



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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
In reply to this post by James Knott
James Knott wrote:

> On 01/20/2018 02:13 PM, Per Jessen wrote:
>> James Knott wrote:
>>
>>> On 01/20/2018 12:30 PM, Per Jessen wrote:
>>>>> You have a unique local address (starts with fc00:).  Where's it
>>>>>> coming from.
>>>> Must be a static assignment.
>>> Not necessarily.  It could be the router is configured to provide a
>>> unique local address.  I have done that here with pfSense.
>> Wouldn't that show as "dynamic" ?
>>  
>>
>
> No, it just shows as another address.  My computer has both global
> addresses and unique local.  Both types are assigned via router
> advertisements and show the same link local address for the router.
> As far as the computer is concerned there's no difference, in that
> both are
> routeable.  However, only the global addresses are routeable to the
> Internet.
>
> BTW, after my computer has been up for a week, it will have 8 of each
> type, in addition to the link local address.

On my boxes, every non-static address (apart from link-local)
says 'dynamic'.   Is unique-local treated differently?




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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
On 01/21/2018 02:05 AM, Per Jessen wrote:
>> > BTW, after my computer has been up for a week, it will have 8 of each
>> > type, in addition to the link local address.
> On my boxes, every non-static address (apart from link-local)
> says 'dynamic'.   Is unique-local treated differently?
Carlos used ifconfig which does not show dynamic, so you can't tell.
You use ip, which does show dynamic.

Try both commands and you'll see the difference.


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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
James Knott wrote:

> On 01/21/2018 02:05 AM, Per Jessen wrote:
>>> > BTW, after my computer has been up for a week, it will have 8 of
>>> > each type, in addition to the link local address.
>> On my boxes, every non-static address (apart from link-local)
>> says 'dynamic'.   Is unique-local treated differently?
> Carlos used ifconfig which does not show dynamic, so you can't tell.
> You use ip, which does show dynamic.
>
> Try both commands and you'll see the difference.

Ah, I didn't realise.  I rarely use ifconfig.



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Re: postfix refused to run ipv6? opensuse tumbleweed

Carlos E. R.-2
In reply to this post by James Knott
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On Sunday, 2018-01-21 at 07:05 -0500, James Knott wrote:
> On 01/21/2018 02:05 AM, Per Jessen wrote:
>>>> BTW, after my computer has been up for a week, it will have 8 of each
>>>> type, in addition to the link local address.
>> On my boxes, every non-static address (apart from link-local)
>> says 'dynamic'.   Is unique-local treated differently?
> Carlos used ifconfig which does not show dynamic, so you can't tell.
> You use ip, which does show dynamic.
>
> Try both commands and you'll see the difference.


Sorry, what command is that one? I missed it. I went back the thread but
failed to locate it?

Perhaps "ip addr"?

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
     link/ether 00:21:85:16:2d:0b brd ff:ff:ff:ff:ff:ff
     inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
        valid_lft forever preferred_lft forever
     inet6 fc00::14/64 scope global
        valid_lft forever preferred_lft forever
     inet6 fe80::221:85ff:fe16:2d0b/64 scope link
        valid_lft forever preferred_lft forever

- --
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        Carlos E. R.
        (from openSUSE 42.2 x86_64 "Malachite" at Telcontar)

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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
On 01/21/2018 07:18 AM, Carlos E. R. wrote:

> Sorry, what command is that one? I missed it. I went back the thread but
> failed to locate it?
>
> Perhaps "ip addr"?
>
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
>      link/ether 00:21:85:16:2d:0b brd ff:ff:ff:ff:ff:ff
>      inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
>         valid_lft forever preferred_lft forever
>      inet6 fc00::14/64 scope global
>         valid_lft forever preferred_lft forever
>      inet6 fe80::221:85ff:fe16:2d0b/64 scope link
>         valid_lft forever preferred_lft forever

The commands are ifconfig and ip -6 address show.

The question was about your unique local address, which you had listed
earlier being "dynamic".


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Re: postfix refused to run ipv6? opensuse tumbleweed

Carlos E. R.-2
On 2018-01-21 14:12, James Knott wrote:

> On 01/21/2018 07:18 AM, Carlos E. R. wrote:
>> Sorry, what command is that one? I missed it. I went back the thread but
>> failed to locate it?
>>
>> Perhaps "ip addr"?
>>
>> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
>>      link/ether 00:21:85:16:2d:0b brd ff:ff:ff:ff:ff:ff
>>      inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
>>         valid_lft forever preferred_lft forever
>>      inet6 fc00::14/64 scope global
>>         valid_lft forever preferred_lft forever
>>      inet6 fe80::221:85ff:fe16:2d0b/64 scope link
>>         valid_lft forever preferred_lft forever
>
> The commands are ifconfig and ip -6 address show.
>
> The question was about your unique local address, which you had listed
> earlier being "dynamic".
Telcontar:~ # ip -6 address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 fc00::14/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::221:85ff:fe16:2d0b/64 scope link
       valid_lft forever preferred_lft forever
Telcontar:~ #


But I don't remember having a dynamic address on this machine :-?

I was trying dynamic on the home server the other day, with wlan0; I
still have things to try that I think you suggested.

--
Cheers / Saludos,

                Carlos E. R.
                (from 42.2 x86_64 "Malachite" at Telcontar)


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Re: postfix refused to run ipv6? opensuse tumbleweed

Per Jessen
Carlos E. R. wrote:

> On 2018-01-21 14:12, James Knott wrote:
>> On 01/21/2018 07:18 AM, Carlos E. R. wrote:
>>> Sorry, what command is that one? I missed it. I went back the thread
>>> but failed to locate it?
>>>
>>> Perhaps "ip addr"?
>>>
>>> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>>> state UP group default qlen 1000
>>>      link/ether 00:21:85:16:2d:0b brd ff:ff:ff:ff:ff:ff
>>>      inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
>>>         valid_lft forever preferred_lft forever
>>>      inet6 fc00::14/64 scope global
>>>         valid_lft forever preferred_lft forever
>>>      inet6 fe80::221:85ff:fe16:2d0b/64 scope link
>>>         valid_lft forever preferred_lft forever
>>
>> The commands are ifconfig and ip -6 address show.
>>
>> The question was about your unique local address, which you had
>> listed earlier being "dynamic".
>
> Telcontar:~ # ip -6 address show
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
>     inet6 fc00::14/64 scope global
>        valid_lft forever preferred_lft forever
>     inet6 fe80::221:85ff:fe16:2d0b/64 scope link
>        valid_lft forever preferred_lft forever
> Telcontar:~ #
>
>
> But I don't remember having a dynamic address on this machine :-?

I was just deducing that your fc00:: address as statically assigned
because it didn't say 'dynamic', but as James says, 'ifconfig' wouldn't
have shown that anyway.



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Per Jessen, Zürich (3.4°C)
http://www.hostsuisse.com/ - dedicated server rental in Switzerland.


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Re: postfix refused to run ipv6? opensuse tumbleweed

James Knott
In reply to this post by Carlos E. R.-2
On 01/21/2018 08:36 AM, Carlos E. R. wrote:
> But I don't remember having a dynamic address on this machine :-?
>
> I was trying dynamic on the home server the other day, with wlan0; I
> still have things to try that I think you suggested.

With the ip command, the output will list "forever" or "dynamic".  The
link local address, for example, is forever, but SLAAC addresses are
dynamic.  Manually configured address are also forever.  Dynamic
addresses would be assigned automatically, either via DHCP or SLAAC.


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