How do I block all ports except 22 and 80 in Fedora's iptables?
69313
Block all ports except SSH/HTTP in ipchains and iptables
87361
REJECT vs DROP when using iptables
141550
Block IPs if they access a resource
107045
Allowing FTP with IPTables
89231
Reject host(not ip) using firewalld / firewalld.richlanguage
18002
How to filter ranges of IP addresses?
20883
Systematic attacks on multiple services & ports (getting past NAT) on hobby server
128290
Relatively easy way to block all traffic from a specific country?
30755
ISP blocking port 25
119916
iptables: REJECT not working, but DROP does
101180
How to setup a restricted SFTP server on Ubuntu?
110098
Iptables to allow incoming FTP
45013
How do I find if there is a rogue DHCP server on my Network?
46376
Is there a way to disable the DHCP client in Raspbian Linux on a Rasperry Pi?
45459
How do I use a static IP in Ubuntu 17.10 and newer?
25928
Fedora 25 and disabling whatever is listening on port 111
68563
How do I restrict a specified SSH user to connect only from one IP or hostname?