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bgp configuration via bird on vultr's ubuntu 18.04 instance
As vultr support breaking /24 subnet down to /32 to be configured into individual instance, I am trying to configure bird on ubuntu 18.04.
Just wanted to mention, I am not good at networking and following configuration is compiled after reading several articles/tutorials 
Instance IP: AAA.AAA.AAA.AAA
My Subnet: BBB.BBB.30.0/24
MY ASN: 123456
Trying to Configure: BBB.BBB.30.5/32
So far I have following configurations which seems to be working and need to make sure if this is correct or if there is better way to do it:
/etc/bird/bird.conf
router id AAA.AAA.AAA.AAA;
filter filterSubnet {
if net = BBB.BBB.30.5/32 then accept;
reject;
}
protocol bgp vultr
{
local as 123456;
source address AAA.AAA.AAA.AAA;
import none;
export filter filterSubnet;
graceful restart on;
multihop 2;
neighbor 169.254.169.254 as 64515;
password "password-removed";
}
protocol static
{
route BBB.BBB.30.0/24 via AAA.AAA.AAA.AAA;
}
protocol direct
{
interface "ens3";
}
protocol device {
scan time 5;
}
/etc/netplan/10-ens3.yaml
network:
version: 2
renderer: networkd
ethernets:
ens3:
dhcp4: yes
addresses: [BBB.BBB.30.5/32]
Comments
Might want to look at fixing that before breaking the internet in its entirety! Things like that happen from inexperience, lack of understanding and lack of rigour.
While I completely agree with Jack, on first sight, it looks like this config should suffice for announcing the /32. Vultr's routers should prevent this /32 announcement from being exported to their upstreams/ peers. As you are not exporting the full /24, Vultr cannot export that to their upstreams making your range as a whole unreachable via them (i.e. no-one would get routed to Vultr and as a result Vultr cannot pass the traffic on to you). You may wanna try to add the full /24 in your export filter.
As you state you are not good at networking, it may be worth to dive into DN42 and get some experience over there first. They use the exact same protocols as used in the 'real world' causing it to be an excellent playground for you to learn ;-)
I find this post. https://exenews.com/configuring-bgp-on-vultr/
Maybe help you