Feature request: luci-mod-network: support P flag for DHCPv6 config.

[GoetzGoerisch]

What would you like to see in luci?

openwrt/odhcpd#301 added the config and possibility in odhcpd.

Please add this also as a luci-mod-network option to the RA Flags per interface.

[systemcrash]

I've been thinking how to implement it. The P flag does not belong to router flags (it exists under a PIO). @Alphix and I still intend to implement a "per-prefix" control/config system, and I imagine the P flag will belong to that.

Today it's implicitly controlled by disabling any of DHCPv6, DHCPv6-PD, DHCPv6-PD Preferred config flags, for forwarded RAs. It's not implemented for normal sends, not least because DHCPv6-PD... does not work. That's something else that needs some work :)

[GoetzGoerisch]

The P flags is in the PIO but it still is a RA Flag as it is contained in the RA message.

We should also have a PD maximum length btw. openwrt/odhcpd#352

[Alphix]

...DHCPv6-PD... does not work...

Wut?

[systemcrash]

If you receive a Prefix via PD from upstream, you cannot distribute any of it downstream via PD. odhcpd is not aware of its original characteristics. netifd assigns the prefix to the lan bridge.

[systemcrash]

The P flags is in the PIO but it still is a RA Flag as it is contained in the RA message.

Not an RA flag, a router flag. Those pictured above are router flags.

We should also have a PD maximum length btw.

Not unreasonable. odhcpd needs it first :)

[GoetzGoerisch]

We are missing the other flags as well, as we have no Luci option to change the router pref as well.
https://www.rfc-editor.org/rfc/rfc4191

Maybe a list with check boxes instead of the current drop down?

[systemcrash]

We are missing the other flags as well, as we have no Luci option to change the router pref as well. https://www.rfc-editor.org/rfc/rfc4191

I like how the dropdown groups things together. Yeah, changing router pref is not common unless you've multiple gateways. How should it look and where should it go?

[Alphix]

LuCI doesn't really like/support mixing different cfg variables in one widget, right?

[GoetzGoerisch]

I'm fine with:

• Add check box for P flag in PIO as a new item.

With @Alphix comment I understand the issue you where referring to.

Should a write a separate FR for the Router Pref?
That's how router pref is done in another CPE UI:

[Alphix]

Should a write a separate FR for the Router Pref? That's how router pref is done in another CPE UI:

Haha...my anger at being forced by my ISP to use a FritzBox (and their refusal to give me the oh-so-secret PPPoE username/password that I needed to connect to their network) when I moved to Germany was one reason why I started hacking on OpenWrt many years ago... 😆

[Alphix]

If you receive a Prefix via PD from upstream, you cannot distribute any of it downstream via PD. odhcpd is not aware of its original characteristics. netifd assigns the prefix to the lan bridge.

Haven't really experimented with that (yet). But PD of e.g. ULA works. I have my test router pulling a /56 PD from the /48 ULA that the main router has defined.

[systemcrash]

I guess these are best housed under IPv6 settings?

[GoetzGoerisch]

What a coincidence. I was just looking at the UI.
As a checkbox next to the PD length would be reasonable IMHO.

[systemcrash]

[systemcrash]

Closed by c937c7f