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

29 Nov 2021

      Good morning Nicolas,

IP assignment is handled differently to IP routing. You can use the
"radv" protocol
(https://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.11) for
assignment.

Best regards,

Nico

Nicolas Embriz <nbari@tequila.io> writes:
...
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.
--
Sustainable and modern Infrastructures by ungleich.ch

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

Nico Schottelius