Before starting with this guide you need to establish BGP peering session between FastNetMon and your network equipment using this guide.

For this manual you need to know community number used for Blackhole (RFC 7999) at router side

Enable announces about attacked host:

sudo fcli set main gobgp_announce_host enable

Then specify blackhole communities used in your network (I personally encourage you to use recommended by RFC 7999 number, 666). Please use only 16 bit ASN numbers (< 65535) for communities here:

sudo fcli set main gobgp_communities_host_ipv4 65001:666
sudo fcli set main gobgp_communities_host_ipv4 65001:667

You can specify custom next hop for announce this way:

sudo fcli set main gobgp_next_hop 10.10.10.1
sudo fcli commit

Starting from 2.0.360 we have option to specify next hop only for host announces:

sudo fcli set main gobgp_next_hop_host_ipv4 1.2.3.4
sudo fcli commit

After this it’s nice to check that we could announce IP’s correctly. We could ban some test IP for it

sudo fcli set blackhole 11.22.33.44

You can check all active outgoing announces this way:

gobgp global rib -a ipv4

You could check status for all neighbors this way

gobgp neighbor

You can check peering session status this way:

gobgp neigh 22.33.44.55

In addition to per host announces FastNetMon can announce network which includes host under attack.

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