[atlas] Probe DHCPv6 support

Hi Simon,

I was actually thinking about the server side, not the client side. The client side I’ll figure out, I have some experience with OpenWRT ;)

Do you have examples for that on relevant DHCPv6 implementations?

Regards,

Michel

> On 15 May 2023, at 20:57, Simon Brandt via ripe-atlas <ripe-atlas at ripe.net> wrote:
> 
> Hi Michel,
> 
> sorry, i don't have an OpenWrt device that's using DHCPv6 in client mode.
> But it should be easy. Make sure the 'odhcp6c' package is installed (which is the case by default).
> Then change the protocol option for the interface:
> 
> /etc/config/network
> 
> config interface 'eth0'
>     option proto 'dhcpv6'
> 
> Check out this link to see als available options for the DHCPv6 client mode:
> https://openwrt.org/docs/guide-user/network/ipv6/configuration#protocol_dhcpv6
> 
> 
> As far is i can see, you can only use OpenWrt in DHCPv4 client mode OR in DHCPv6 client mode. So i guess, you have to write a small script. First try DHCPv6 and check if you can successfully get a configuration. If not, fall back to DHCPv4. Continuously toggle between DHCPv6 and DHCPv4 as long as you don't get a configuration. I would begin this loop with DHCPv6. Also keep in mind, that some DHCP server respond slow, so better wait a little bit, before switching the protocol.
> 
> 
> BR,
> Simon
> 
> 
> 
> On 15.05.23 09:12, Michel Stam wrote:
>> Hi,
>> 
>> Good discussion!
>> 
>> I’m currently looking at basing all the probes (3, 4 and 5) on OpenWRT 22.03 which is the latest stable. What I’ll do is take this along in the deliberations, and see if I can fit this into the firmware image somehow.
>> 
>> Simon: can you provide the exact setup you use for testing? (Config snippets etc) I typically don’t have a problem on my setup here, but thats RA + DHCPv6, I don’t use DHCPv6 for the actual assignment.
>> 
>> Regards,
>> 
>> Michel
>> 
>>> On 9 May 2023, at 20:27, Simon Brandt via ripe-atlas <ripe-atlas at ripe.net> <mailto:ripe-atlas at ripe.net> wrote:
>>> 
>>> That should be "odhcp6c"
>>> 
>>> https://openwrt.org/packages/pkgdata/odhcp6c
>>> https://github.com/openwrt/odhcp6c
>>> 
>>> 
>>> BR,
>>> Simon
>>> 
>>> On 09.05.23 20:22, Philip Homburg wrote:
>>>> 
>>>> In any case, Atlas probes run a stripped down version of OpenWRT. It may help
>>>> if somebody can figure out which OpenWRT packages need to be added to 
>>>> enable DHCPv6.
>>> 
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>>> https://mailman.ripe.net/
>> 
> 
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