Re: DHCPv6 client compliance to RFCs.

Jukka Rissanen Wed, 17 Apr 2013 01:05:52 -0700

On 17.04.2013 10:13, harshal patel wrote:

Hi Jukka,


Thank you very much for your prompt reply. :-)


On Wed, Apr 17, 2013 at 12:11 PM, Jukka Rissanen
<jukka.rissa...@linux.intel.com <mailto:jukka.rissa...@linux.intel.com>>
wrote:

    Hi Harshal,


    On 17.04.2013 08:24, harshal patel wrote:

        Hi all,

        I am planning to test behavior of "dhcp6c" of ConnMan.
        In opensource there is test suite provided by TAHi for checking
        DHCPv6
        client compliance to RFCs. (http://www.tahi.org/logo/__dhcpv6/
        <http://www.tahi.org/logo/dhcpv6/>)

        I have performed this on dhcp6c client of "wide-dhcpv6".

        To perform TAHI testing on ConnMan, basically we need to
        configure dhcp6c
        of ConnMan in the way TAHI expects.

        I am newbie to ConnMan. As far as I know, ConnMan has internal
        dhcp6c
        client which can be started/configured using Python test
        scripts. (I am not
        sure, whether there is better way to control it, please let me
        know if you
        are aware of it) But I couldn't figure out following things:
        *1. How to know whether dhcp6c of ConnMan is running.*

             * e.g. using "ps" command or something.


    The dhcpv6 client is integrated in connmand and it works pretty much
    automatically. You get dhcpv6 activated if these two conditions are met:

    1. IPv6 method of the connecting service is set to AUTO. By default
    the IPv6 method is AUTO. You can see the current method by giving
    these commands:
          connmanctl services
    from the generated list, pickup a <service-id> of the desired service
          connmanctl services --properties <service-id>

    AND
    2. DHCPv6 is automatically started if connmand receives router
    advertisement message that tells we should use dhcpv6 addresses from
    the server. If RA message is not received or it tells we should only
    use SLAAC, then DHCPv6 is not activated.


I have also tried the same using "set-ipv6-method", which I guess
similar to connmanctl.


Yes, that python script can be used also for this purpose.


But here, everything depends on RA. I was just wondering is there any
way to select the way(stateless/statefull) dhcp6c started by user?
I mean, can user select any one of this method of dhcp6c:
1. Statelss DHCPv6 (info request only)
2. Statefull DHCPv6

No, address selection is suppose to be automatic so no user interactionis needed or desired. The network should tell what services it supportand we use it automatically.



        *2. Is there any dhcp6c.conf or similar file in ConnMan. If yes,
        where is
        it located? And how to modify it.*


    There is no configuration file for that. One can turn off DHCPv6 if
    the service IPv6 method is set to something else than AUTO, like OFF
    for example. You can set the method to OFF using this command
          connmanctl config <service-id> --ipv6 off


I guess, if I switch IPv6 in manual mode then it should be fine. What
you think?


Manual mode means static ip address so no dhcpv6 is started in that mode.





        This can be* benchmark for "dhcp6c" behavior of ConnMan*.


Thanks.

~HK



Cheers,
Jukka

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