Mailinglist Archive: wicked-devel (3 mails)

[Marius Tomaschewski <mt@xxxxxxx>]

Am 19.02.2016 um 13:52 schrieb Scott Simpson:
> On 2/19/16 3:13 AM, Marius Tomaschewski wrote:
> > Am 30.12.2015 um 01:37 schrieb Scott Simpson:
> > > I'm using OpenSuSE 42.1 and wicked network management. The wickedd-dhcp6
> > > program is not grabbing the global IPv6 address.
> > I guess your network admin did not enabled ipv6 router RAs
> > (there will be no default route and also no DHCP6 or AUTO6)
> > or disabled DHCP6 in it.
> >
> > Add DHCLIENT6_MODE=managed to ifcfg-ethX to override.
> >
> > ## Type:        list(auto,managed,info)
> > ## Default:     auto
> > #
> > # This option allows to specify the request mode used by the DHCPv6
> > # client when the BOOTPROTO is set to dhcp or dhcp6, and overrides
> > # the "Managed Address Configuration" and the "Other Configuration"
> > # flags provided by the IPv6 router its Router Advertisement (RA)
> > # for the network connected to this interface.
> > #
> > #   auto:    follow RA flags, remain silent when no RA flag is set
> > #   info:    request other configuration (dns,ntp) only, no IP address
> > #   managed: request IP address as well as other configuration
> > #
> > DHCLIENT6_MODE="auto"
> I'll try this and let you know. I was running OpenSUSE 12.1 before with
> NetworkManager and the global IPv6 address was always picked up so it
> isn't Comcast's issue.

Don't know / remember what NetworkManager is doing here.

Earlier versions (sysconfig) did not monitor any events and ignored
ipv6 router RA / network admin settings and just asked dhcp6 server
in managed mode, even the network rules say something else.

Install radvd and call radvdump and let it run a longer time (600 sec
at least) until you can see something like this (a managed network):

interface eth0
{
        AdvSendAdvert on;
        # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
        AdvManagedFlag on;              ## IP and dns,ntp via dhcpv6
        AdvOtherConfigFlag on;          ## dns,ntp via dhcpv6 only
        AdvReachableTime 0;
        AdvRetransTimer 0;
        AdvCurHopLimit 64;
        AdvDefaultLifetime 3600;        ## >0, set default route
        AdvDefaultPreference high;
        AdvHomeAgentFlag off;
        AdvSourceLLAddress on;

        prefix 2001:db8:1234:5678::/64
        {
                AdvValidLifetime 3600;
                AdvPreferredLifetime 2400;
                AdvOnLink on;
                AdvAutonomous off;      ## IP address autoconf disabled
                AdvRouterAddr off;
        }; # End of prefix definition

}; # End of interface definition

We use DHCLIENT6_MODE="auto" default to follow the network admin to
provide the settings in the RA, except the local admin overrides it
to use managed||info dhcpv6 request.

The kernel receives the ipv6 RA packets and is using the RA to set the
default route (on accept_ra > 0 and accept_ra_defrtr > 0), autoconfigure
IP address (${prefix}:${eui64_from_mac}/64 on autoconf=1 and also
${prefix}:${random}/64 on use_tempaddr > 0) and forward these info to
the userspace to make the rest, where wickedd[-dhcp6] is listening for
the kernel events and making the dhcpv6 requests.

See also
https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt

Gruesse / Regards,
 Marius Tomaschewski <mt@xxxxxxx>, <mt@xxxxxxxx>
-- 
 SUSE LINUX GmbH, GF: Felix Imendörffer, Jane Smithard,
 Dilip Upmanyu, Graham Norton, HRB 21284 (AG Nürnberg),
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