• nftables. The program name is nft. nft is an administration tool of the nftables framework for packet filtering and classification
• Debian on iptables
• fail2ban - bans IP that makes too many password failures by adding firewall rules. An experience
• iptables (firewall) - administration tool for IPv4/IPv6 packet filtering and NAT
• netfilter-persistent - load, flush and save netfilter rule sets
• Debian on nftables
• https://wiki.debian.org/nftables
• sshguard - block brute-force attacks by aggregating system logs
• tcpd - access control facility for internet services
• tcpdump
• tcpspy
• ufw - program for managing a netfilter firewall

• man 5 hosts.deny = man 5 host.allow = man 5 hosts_access - format of host access control files
• man 5 hosts_options - host access control language extensions

If you want to protect the portmapper read rpcbind(8) and rpc.mountd(8)

IP blocks
Geolite2

You can use /etc/host.deny and /etc/hosts.allow to manage the network access to a computer
Add to /etc/host.deny

ALL : ALL

Add to /etc/hosts.allow

sshd: The IP address of the hosts who's access has to be granted

• Buypass Go SS
• Lets Encrypt
• ZeroSSL

See setting up your own root certificate authoroty

Avahi can leak data since it is a file share and service detection system on the network

Hypponens law
Punk spider searches for vulnerable websites

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