What does the "Use builtin IPv6-management" checkbox do?

Installing and Using OpenWrt Network and Wireless Configuration
1

In the advanced settings of each network interface, I see a checkbox titled "Use builtin IPv6-management" that is enabled by default. If disabled, it adds option delegate '0' to the configuration of that interface in /etc/config/network. What effect does this setting have?

2

I think it controls prefix delegation if the interface has IPv6 connectivity and provides a prefix, usually when using DHCPv6.

https://openwrt.org/docs/guide-user/network/ipv6/start#protocol_dhcpv6

As per @lleachii, please see their response for a more comprehensive explanation.

3

I was about to make a thread on this when I decided to search for more terms related to this.

This is not accurate, in fact the opposite is true when you mentioned DHCPv6. I just came across this looking over my network interfaces. I have an interface using only SLAAC (Router Advertisement-Service in "server mode" with the remaining disabled); and I just discovered that the Interface had the setting option delegate '0' set. I first thought exactly what you said; and somehow I thought I setup IPv6 for a server (which severely needs it!!!)...but I was afraid that I forgot to test and that it may not be working. :bulb:

So I proceeded to:

  • On the router run: ip -6 neigh | grep eth0.x :sweat_smile: (working!!!)
  • SSH to server and run ip -6 addr :sweat_smile: (working!!!)

I appreciate the link to the Wiki. I was also searching for this; but it seems I improperly searched in /etc/config/network - related pages (my Search Fu has been horrible this week...well guess I'm improving...lol).

So, the link says:

Name Type Required Default Description
delegate boolean no 1 Whether to enable prefix delegation in case of DS-Lite/map/464xlat

therefore:

  • IPv6 dual-stack lite
  • Mapping of Address and Port
  • 464xlat

These are all technologies that uses one IP version to convey the other across networks.

I hope this helps.

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4

I think they should either add a help message to the GUI with a more human description like yours or just copy the wiki definition of delegate. And possibly rename the GUI option name to something that more accurately describes its intended function.

5

Thanks for correcting me and clarifying with your findings and information!

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