I think the current patch may cause problems if someone is using a
different uplink interface than what is used to calculate the mac-address
of the device.
The most conservative way to introduce support for ipv6 link-local, in
order to not risk breaking usage for existing installations, is to
introduce an option which is disabled by default and has 3 possible values:
- '0' (disabled, this should be the default)
- '1' (enabled and value defaults to $MAC_INTERFACE)
- 'interface_name' (explicit interface name)
The name for this option could be simply "interface".
I have updated the pull request.
Federico
On Wednesday, April 5, 2017 at 1:47:59 PM UTC+2, Кирилл Луконин wrote:
>
> Yes, I'm talking about link-local ipv6.
>
> The main case is to use link-local addresses for administration, but
> without need to install and configure a dhcp server or work in parallel
> with the current dhcp.
>
> 1) Provide openwisp hostname with avahi.
> 2) Resolve hostname on target devices
> 3) Register automatically using resolved hostname.
>
>
> Without --interface option curl fails with error code 7. That's i found
> through logread.
> Strace shows error more clearly:
>
> connect(3, {sa_family=AF_INET6, sin6_port=htons(443), inet_pton(AF_INET6,
> "fe80::d1d3:caec:592f:5cf2", &sin6_addr), sin6_flowinfo=htonl(0),
> sin6_scope_id=0}, 28) = -1 EINVAL (Invalid argument)
> close(3)
>
>
>
>
>
>
> среда, 5 апреля 2017 г., 13:40:12 UTC+5 пользователь Federico Capoano
> написал:
>>
>> Hi Krew,
>>
>> I've read the curl docs regarding the --interface argument but I'm
>> confused by the aim of the pull request: it mentions adding support for
>> ipv6, but I have done some tests right now with tcpdump and verified that
>> curl already supports ipv6, I even had an instance of openwisp2 deployed on
>> a server with ipv6 address which would show ipv6 addresses in the "last ip"
>> field of configuration objects (which means curl downloaded configurations
>> via ipv6).
>>
>> It seems to me that you want to add support for sending http requests to
>> ipv6 link local addresses, which is a slightly different thing, but I need
>> to know more about your use case in order to understand what is that you
>> are not able to do right now and what's the best way to add support for it.
>>
>> Could you also paste your /etc/config/openwisp configuration
>> (anonymizing any sensitive information like uuid, keys or shared secret)?
>>
>> Could you tell me the error your are getting by trying that configuration
>> with the current unmodified openwisp-config version?
>> You can see such an error with:
>>
>> logread | grep openwisp
>>
>> Federico
>>
>> On Wed, Apr 5, 2017 at 8:20 AM Кирилл Луконин <[email protected]> wrote:
>>
>>> Sure.
>>>
>>> Here some tips about --interface option
>>>
>>> https://sites.google.com/site/xiangyangsite/home/technical-tips/linux-unix/common-tips/manual----curl-usage-explained-with-examples
>>>
>>> And explanation why it should be specified.
>>>
>>> https://blogs.gentoo.org/eva/2010/12/17/things-you-didnt-known-about-ipv6-link-local-address/
>>>
>>>
>>>
>>> вторник, 4 апреля 2017 г., 23:56:15 UTC+5 пользователь Federico Capoano
>>> написал:
>>>
>>>> Hi Krew,
>>>>
>>>> welcome and thank you for contributing actively.
>>>>
>>>> any good resource you suggest to read about this issue?
>>>>
>>>> Federico
>>>>
>>>>
>>>> On Tuesday, April 4, 2017 at 8:34:14 PM UTC+2, Кирилл Луконин wrote:
>>>>>
>>>>> Hello, friends.
>>>>>
>>>>> I tried to migrate from ipv4 and faced the issue with curl. It does
>>>>> not normally work with ipv6 addresses and hostnames, resolved to ipv6
>>>>> without --interface option. It' a known bug, so i decided to make a pull
>>>>> request.
>>>>>
>>>>> https://github.com/openwisp/openwisp-config/pull/30
>>>>> Is it a solution, what do you think?
>>>>>
>>>>>
>>>>> Best regards,
>>>>> Krew.
>>>>>
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>>
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