On Mar 21, 2018, at 8:54 AM, Charles van Niman <charles@phukish.com> wrote:

Hey Mike,

   Not sure what platform you're running BIRD on, but in Ubuntu/Linux, I use loopback interfaces to do this. Here is what my interfaces file / BIRD config look like. I am using /32s, but I don't think there are any issues with /24s going into BGP. Let me know if you have any questions or I missed your questions in some way.

/etc/network/interfaces:

# The loopback network interface
auto lo
iface lo inet loopback

auto lo:10
iface lo:10 inet static
        address 172.22.150.126
        netmask 255.255.255.255

auto lo:11
iface lo:11 inet static
        address 172.27.255.29
        netmask 255.255.255.255

auto lo:20
iface lo:20 inet static
        address 172.22.150.119
        netmask 255.255.255.255

bird.conf:

protocol direct {
  interface "lo*";
}

/Charles van Niman

On Wed, Mar 21, 2018 at 7:13 AM, Michael McConnell <michael@winkstreaming.com> wrote:

Hello fellow Bird users,

I’ve run into a strange issue trying to subnet a /24 into a series of smaller /27 and /28’s and have the routed via BGP.

I currently do the following; route 10.10.10.0/24 reject;

However if I don’t bring the interface up as a /24 (i.e. ifconfig eth0:10 10.10.10.10 netmask 255.255.255.0 up) I am unable to get the route explored when I run show route - the interface needs to be online in order for “show route” to show the import as a unreachable.

I can kinda make this work through a series of strange static routes, but this seems incorrect. Can anyone suggest a better way to ensure my /24 is announced regardless so that I can then subnet it down for the purpose of serving over a VPN the /28’s and /27’s?

Hopefully that question makes sense and isn’t too much nonsense.

Thanks for you help and comments!

Mike

--

Michael McConnell
WINK Streaming;
email: michael@winkstreaming.com
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