Bogon filter in use on our gateway (all packets with these source addresses are dropped):
# ipset list Bogons Name: Bogons Type: hash:net Header: family inet hashsize 1024 maxelem 65536 Size in memory: 17208 References: 6 Members: 10.0.0.0/8 169.254.0.0/16 172.16.0.0/12 198.51.100.0/24 127.0.0.0/8 192.0.2.0/24 213.222.29.194 224.0.0.0/4 100.64.0.0/10 203.0.113.0/24 240.0.0.0/4 0.0.0.0/8 192.168.0.0/16 44.128.0.0/16