New to routing: what protocol do I need?

[Arnaud Houdelette-Langlois]

Hi

The ISP-side router needs to know that it must route the /64s to your 
router.

Most of the time this is done via DHCPv6/PD (PD stands for 
Prefix-Delegation). You won't be able to do this with bird.

Router advertisement do not do routing at all. It is just there to 
auto-configure hosts.

Arnaud Houdelette-Langlois
Administrateur des infrastructures systèmes et réseaux
Normandie Université
+33 2 31 56 69 54

Le 26/04/2023 à 11:34, Alessandro Vesely a écrit :
> On Tue 25/Apr/2023 19:12:13 +0200 Kevin P. Fleming wrote:
>> On Tue, Apr 25, 2023, at 12:40, Alessandro Vesely wrote:
>>> I don't know what protocol I need.  It is a new question.  I should 
>>> know what protocol is using the next hop on ppp0 (default gw).  I'm 
>>> not even sure what IPv6 hosts are out there; traceroute shows 
>>> nothing.  Running traceroute from an external site I find that, 
>>> wherever the trace starts from, it falls into a loop:
>>
>> It might be best to back up a bit here. Can you describe the 
>> scenario: what is the network topology, and what requirements are 
>> placed on you by any upstream or downstream networks? In addition to 
>> those, what are your goals in using Bird?
>
>
> I changed ISP, and they assigned me a /56 of IPv6 addresses.  My 
> previous experience with IPv6 was using a tunnel offered by route48 
> for free.  In that case, I just plugged it in and it worked.  With my 
> new ISP, I configured a couple of addresses on the interface (ppp0, 
> they use PPPoE) but saw no IPv6 traffic.  I opened a ticket at the 
> ISP, they said something wrong on my side.
>
> I set up a /64 to use internally, and saw IPv6 works on the internal 
> network. One internal user even managed to synthesize an IPv6 address 
> in that range and connect to the server via WiFi. IPv6 on the lan is 
> not a problem.
>
> I tried https://tools.keycdn.com/traceroute, and saw there is a loop.  
> I had seen routing loops before, in IPv4, and they were usually errors 
> in some static table somewhere.  My ISP repeated that everything is 
> fine on their side.  So I derived I need some routing.
>
>
>> Bird does not actually *route* traffic at all, please keep that in 
>> mind. It is a routing table (FIB) manager, with a little bit of extra 
>> functionality for IPv6 Router Advertisements and some other bits. It 
>> gathers route information from a variety of sources, combines it 
>> together in the ways you tell it to, and then publishes some (or all) 
>> of it to the destinations you configure.
>
>
> My understanding of radv is that it finds neighbors by itself. Should 
> I configure any?  And can I check what hosts it found?
>
>
>> Since it may not even be the right tool for the problem you are 
>> trying to solve, it would be helpful if you could describe the 
>> problem first. With that information the Bird user community can 
>> suggest ways Bird might be applicable, if it is.
>
>
> The main problem is that my addresses, e.g. 2a02:29e1:300:e900::1, are 
> not reachable from the wan.  Symmetrically, I don't seem to be able to 
> reach any external host on IPv6.  The only hint that the interface 
> works at all on IPv6 is that nmap says "Host is up." How can I get 
> some visible reply from those hosts (2a02:29e1::a 
> 2a02:29e0:109:ff00::5 2a02:29e0:255::2)?
>
>
> Best
> Ale
>
>
>
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