Good morning^2, as virtually all parts in our datacenters have become IPv6 only, I was wondering if it was easy to add a feature to bird to automatically BGP peer with all alive link local neighbours? Motivation and situation ------------------------ Every node has an IPv6 link local address on every network interface. Bird already supports dynamic peers, including whitelisting of ranges. Instead of specifying specific ranges, it would be great if two or more routers could be placed in the same layer 2 segment and would automatically BGP peer with each other, thus removing any configuration needs. OSPF does a similar job already, however it is not suitable for transferring the BGP attributes. Implementation sketch -------------------------------------------------------------------------------- The idea would be for each router have something on the line of protocol bgp fe80auto { local as 65532; neighbor range fe80::/12 as 65534; dynamic name "link_local_"; # New option, similar to the OSPF option auto_fe80_interfaces "eth1.*"; ipv6 { }; ipv4 { }; } If bird had the stanza auto_fe80_interfaces in it, it would a) ping ff02::2 and record all results b) For each result, excluding our own address, connect to the other nodes c) On expiry or regular interal, go back to (a) and clear peers -------------------------------------------------------------------------------- Maybe this is already possible in current bird, but I haven't found a direct way to dynamically solve this. Looking forward to your thoughts, Nico -- Sustainable and modern Infrastructures by ungleich.ch