Current situation about IPv6

Current situation about IPv6

[Spencer Ku (古世瑜)]

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Hi Teams,
I am interesting about what is the current situation about IPv6.
Now I am trying to use ipmi command to get/set IPv6 settings, but I cannot get current result.
For example, ipmi command will response empty IPv6 address to me even if my environment is already having IPv6 address.

After that, I find a mail which is discussing about the IPv6 setting. And here is part of description from mail:

Ø  Currently phosphor-networkd doesn't support SLAAC(DHCPV6, Router advertised address)

Does it mean that I need to set a special network environment without SLAAC and that can let IPv6 ipmi command work normally?

Thank you.

Sincerely,
Spencer

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From: Ratan Gupta <ratagupt@linux.vnet.ibm.com>
To: "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: Re: Why IPv6AcceptRA is disabled in phosphor-network
Date: Fri, 10 Jul 2020 12:01:17 +0000
Message-ID: <94f3de2f-f048-6fea-35c3-6b2b8d6d3239@linux.vnet.ibm.com>

Hi David,

On 7/7/20 4:39 PM, David Wang (王振宇) wrote:
> Hi all,
>    I want to set DHCPv6 to enable by default in my BMC.
> That is, I can delete /etc/systemd/network/00-bmc-eth*.network
> and reboot and still have DHCPv6 reachable.
>
> But I notice that IPv6AcceptRA is disabled in phosphor-network
> in order not to handle the ipv6 routing advertisement message periodically.
> See: https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-networkd/+/8361
Currently phosphor-networkd doesn't support SLAAC(DHCPV6, Router 
advertised address).
>
> Why we need to avoid handling RA periodically?

If you have bad router configured in network which keeps sending the 
routing prefix frequently, phopshor-networkd frequently refreshing its 
D-bus objects.It can be fixed as ignore the refreshing of the Dbus 
objects if there is a D-bus object entry for the given IP address.

> Does it cause any bad effect?
> If I want to keep the acceptance RA, how should I configure it?
> Or should I just patch "IPv6AcceptRA=true" in phosphor-network of my BMC?
If we fix the behavior as suggested above there should not be a problem.
>
> Thank you,
>
> Regards,
> David