how to do IPv6 address assignment (eBGP --> iBGP --> home/lan)

28 Nov 2021

      Hi, I manage to configure, establish a session and announce my prefix with
this configuration:

---
log "/var/log/bird.log" all;
router id <ipv4>;
define MYAS = 1234;

protocol device {
    scan time 10;
}

protocol direct {
    ipv6;
    interface "dummy*";
}

# templates
template bgp uplink {
   local as MYAS;
   ipv6 {
      import all;
      export filter {
        if net = <ipv6::/44> then accept;
        reject;
      };
   };
   graceful restart on;
}

protocol bgp SBv6 from uplink {
   neighbor <ipv6> a as 12345;
   source address <myipvy>;
}
---

For testing I added to eth0 an IPv6 address alias belonging to my  /44
segment, I was available to ping and so far all good, but now something
that I am struggling with (probably something very basic) is how to do IP
address assignment to my network from the router?

This router is a VM but I would like to know how I could use a /64 subnet
and  assign  IP's to my home network.

Probably I am following the wrong approach, but I wanted to give a try
creating an internal router (iBGP) and announce only the /64 subnet, I am
using wireguard to connect the VM's but can't find a way to ping any IP I
assign in this VM, something like this

(internet)
    |
    |
( VM eBGP/44 ) <--- Wireguard ---> (VM iBGP/64) <----> HOME/LAN (/64)

 this is my config:

log "/var/log/bird.log" all;
router id <ipv4>;
define MYAS = 1234;

protocol device {
        scan time 10;
}

protocol direct {
        ipv6;
        interface "dummy*";
}

template bgp iAS {
        local as MYAS;
        ipv6 {
                import all;
                export filter {
                        if net = <ipv6::/64> then accept;
                        reject;
                };
        };
        graceful restart on;
}

protocol bgp iBGP from iAS {
        debug all;
        neighbor <peer wireguard ipv6>%wg0 as MYAS;
        direct;
        source address <wireguard ipv6>;
}

The session gets established but only from the eBGP I can ping the iBGP but
not the other way around or from other hosts.

Probably I may be over-complicating things, and I could do everything from
the main router but is that the case, still wondering how can I then start
to assign IPv6's address to my home network? should I configure something
like radvd so that my devices can claim an IPv6?

I am doing this just for learning purposes, so if there is a better way or
practice to follow let me know.

regards.

how to do IPv6 address assignment (eBGP --> iBGP --> home/lan)

Nicolas Embriz