netdev - Re: IPv6 addr and route is gone after adding port to vrf (5.2.0+)

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Message-ID: <3cd9b1a7-bf87-8bd2-84f4-503f300e847b@candelatech.com>
Date:   Fri, 11 Oct 2019 06:57:09 -0700
From:   Ben Greear <greearb@...delatech.com>
To:     David Ahern <dsahern@...il.com>, netdev <netdev@...r.kernel.org>
Subject: Re: IPv6 addr and route is gone after adding port to vrf (5.2.0+)

On 8/16/19 2:48 PM, David Ahern wrote:
> On 8/16/19 3:28 PM, Ben Greear wrote:
>> On 8/16/19 12:15 PM, David Ahern wrote:
>>> On 8/16/19 1:13 PM, Ben Greear wrote:
>>>> I have a problem with a VETH port when setting up a somewhat complicated
>>>> VRF setup. I am loosing the global IPv6 addr, and also the route,
>>>> apparently
>>>> when I add the veth device to a vrf.  From my script's output:
>>>
>>> Either enslave the device before adding the address or enable the
>>> retention of addresses:
>>>
>>> sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
>>>
>>
>> Thanks, I added it to the vrf first just in case some other logic was
>> expecting the routes to go away on network down.
>>
>> That part now seems to be working.
>>
> 
> The down-up cycling is done on purpose - to clear out neigh entries and
> routes associated with the device under the old VRF. All entries must be
> created with the device in the new VRF.

I believe I found another thing to be aware of relating to this.

My logic has been to do supplicant, then do DHCP, and only when DHCP
responds do I set up the networking for the wifi station.

It is at this time that I would be creating a VRF (or using routing rules
if not using VRF).

But, when I add the station to the newly created vrf, then it bounces it,
and that causes supplicant to have to re-associate  (I think, lots of moving
pieces, so I could be missing something).

Any chance you could just clear the neighbor entries and routes w/out bouncing
the interface?

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com