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radvd-project / radvd

radvd | Official repository: https://github.com/radvd-project/radvd
https://radvd.litech.org/
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Is it possible to delegate an ipv6-prefix with radvd? #159

Closed deep-42-thought closed 3 years ago

deep-42-thought commented 3 years ago

I get a /48 prefix from upstream dhcp6, of which I advertise two /64 prefixes on downstream interfaces via radvd. Now, I'd like to delegate another /64 (or anything between /48 and /64) prefix to one client on one of those interfaces. Is that possible with radvd? I seem unable to find any documentation on how to delegate a whole prefix somewhere.

stappersg commented 3 years ago

FWIW: I don't understand the request

Advice: Rewrite the request in other words

deep-42-thought commented 3 years ago

Ok, I'll elaborate a little more (skip all the details, which you don't want to know):

My router "archlix" runs radvd to advertise X:Y:Z:1::/64 and X:Y:Z:2::/64 subnets on enp0s11 (ethernet/lan) and wlp0s12 (wifi) respectively. The whole X:Y:Z::/48 is routed to archlix from my IPv6 tunnel broker (on some other interface). Now, I have an openWRT router "buoy", which connects on wlp0s12, gets a proper IPv6 address within X:Y:Z:2::/64 and is configured to "Request IPv6-prefix of length 64" (words of "luci", the web frontend of openWRT). Buoy's request for a whole prefix delegation, obviously is not satisfied by archlix, because it has no clue, what prefix should be given to buoy. I would like to delegate the X:Y:Z:3::/64 (or any other X:Y:Z:W::/64 for W>=3) to buoy. It would be ok for me, if radvd only advertised the prefix to buoy, but did not actually put the proper routing rules in place - I can do this manually / by some hand-crafted script.

My question: Can I use radvd to handle this scenario? Or should I be looking for a different tool, here?

stappersg commented 3 years ago

Closing this help me to design my network.

deep-42-thought commented 3 years ago

There seems to be some misunderstanding here: I'm not asking how to design my network, I'm asking, if some feature (prefix delegation) is possible with radvd.

mcr commented 3 years ago

deep-42-thought @.***> wrote:

Is that possible with radvd? I seem unable to find any documentation on how to delegate a whole prefix somewhere.

No, you need a dhcpv6-PD server. It's not in the RA protocol, alas.