Re: ipv6 RA: dhcp-level managed

[Dan Williams <dcbw redhat com>]

On Fri, 2019-01-04 at 07:19 -0500, Brian J. Murrell wrote:
> I see the following message in the debug for NM:
>
> Jan 04 07:02:19 server NetworkManager[1138]: <debug>
> [1546603339.8846] ndisc[0x5592e10188c0,"enp2s0"]:   dhcp-level
> managed

You're not mistaken about the interpretation of those fields, but...

While NM was running, is it possible there was a previous RA that had
"stateful other conf" (eg the M/managed flag) set? To avoid ping-pong
with RA changes or multiple router advertisements from different
routers NM will cache the "most managed" level.

Dan

> Which I presume is what leads to:
>
>  1138 ?        Ssl   16:39 /usr/sbin/NetworkManager --no-daemon
> 26196 ?        S      0:00  \_ /sbin/dhclient -d -q -6 -N -sf
> /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient6-enp2s0.pid -lf
> /var/lib/NetworkManager/dhclient6-90f5409c-bd23-48f
>
> But what in the following RA contents:
>
> Soliciting ff02::2 (ff02::2) on pc_bridge...
>
> Hop limit                 :           64 (      0x40)
> Stateful address conf.    :           No
> Stateful other conf.      :           No
> Mobile home agent         :           No
> Router preference         :       medium
> Neighbor discovery proxy  :           No
> Router lifetime           :         1800 (0x00000708) seconds
> Reachable time            :  unspecified (0x00000000)
> Retransmit time           :  unspecified (0x00000000)
>  Source link-layer address: D4:6E:0E:64:62:B6
>  MTU                      :         1500 bytes (valid)
>  Prefix                   : 2001:1234:525e:a700::/64
>   On-link                 :          Yes
>   Autonomous address conf.:          Yes
>   Valid time              :        81098 (0x00013cca) seconds
>   Pref. time              :        37898 (0x0000940a) seconds
>  Route                    : 2001:456:1d:6f8::/64
>   Route preference        :       medium
>   Route lifetime          :     infinite (0xffffffff)
>  Route                    : 2607:1234:f00f:cd00::/56
>   Route preference        :       medium
>   Route lifetime          :        81173 (0x00013d15) seconds
>  Route                    : 2001:1234:525e:a700::/56
>   Route preference        :       medium
>   Route lifetime          :        81098 (0x00013cca) seconds
>  Route                    : fd31:aeb1:48df::/48
>   Route preference        :       medium
>   Route lifetime          :     infinite (0xffffffff)
>  Recursive DNS server     : fd31:aeb1:48df::2
>   DNS server lifetime     :         6000 (0x00001770) seconds
>  from fe80::d66e:eff:fe64:62b6
>
> is leading NM to believe that it should be running dhclient?  AFAIK,
> I
> have configured this subnet to be autoconfiguration only, which I
> suspect is what the "Stateful * conf. : No" is, but I could very well
> be mistaken about the interpretation of those fields.
>
> Cheers,
> b.
>
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