IPTables

IPTables » Flush

Command	Effect
sudo iptables -t nat -F	Flush NAT Table Rules: To flush rules from the nat table
sudo iptables -F INPUT	Flush a Specific Chain: For example, to flush only the INPUT chain
sudo ip6tables -F	Flush IPv6 IPTables (if applicable): If you’re working with IPv6 IPTables (ip6tables)
sudo iptables -F	Flush All Rules: This command flushes all IPTables rules across all chains

IPTables » Allow SSH » Flush

sudo su
mkdir -p ${HOME}/.config/iptables/
BACKUP_DATE_TIME="$(date +'%Y%m%d-T%H%M')-Z$(date +'%z'|tr '+-' 'PM')"
iptables-save  > ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v4
ip6tables-save > ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v6

iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -F

# iptables-restore  < ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v4
# ip6tables-restore < ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v6

IPTables » Allow SSH » Flush All

sudo su
BACKUP_DATE_TIME="$(date +'%Y%m%d-T%H%M')-Z$(date +'%z'|tr '+-' 'PM')"
stat -c "%a %n"  /etc/ufw/{before,before6,user,user6,after,after6}.rules

mkdir -p ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/
iptables-save  > ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v4
ip6tables-save > ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v6

mkdir -p ${HOME}/.config/ufw/${BACKUP_DATE_TIME}/
rsync -avz /etc/ufw/{before,before6,user,user6,after,after6}.rules \
${HOME}/.config/ufw/${BACKUP_DATE_TIME}/

# default filter policies
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# flush & delete custom chains
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -t raw -F
iptables -t raw -X

# iptables-restore  < ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v4
# ip6tables-restore < ${HOME}/.config/iptables/${BACKUP_DATE_TIME}/rules.v6

# rsync -avz ${HOME}/.config/ufw/${BACKUP_DATE_TIME}/*.rules /etc/ufw/
# chmod 640 /etc/ufw/{before,before6,user,user6,after,after6}.rules
# ufw enable

iptables -S
ufw status numbered

Playground

netstat -uap|grep nginx apt list --installed sudo iptables -S netstat -lpn netstat -a	sudo ss -tulpn | grep LISTEN | grep resolve sudo ss -tulpn | grep LISTEN | grep minio sudo ss -tulpn | grep LISTEN | grep sshd sudo ss -tulwn | grep LISTEN sudo ss -tulpn | grep LISTEN	sudo lsof -i -P -n | grep LISTEN sudo ss -tulpn | grep LISTEN ls -lah /etc/iptables/ ls -lah /etc/iproute2/ ls -lah /etc/ufw/
nc vpn.shahed.biz -uv 1194 # udp nc vpn.shahed.biz -tv 80 # tcp nc vpn.shahed.biz -tv 53 # tcp nc localhost -uv 1194 # udp nc localhost -tv 80 # tcp nmap localhost -sT # tcp nmap localhost -sU # udp	suod journalctl -xeu ufw.service sudo journalctl -xeu iptables sudo journalctl -xeu nftables systemctl daemon-reload journalctl -xe|less journalctl -xe|tail journalctl -xe	sudo -i -u minikube echo $(ip r g $(minikube ip)|awk '{print $3}'|head -n1) sudo nmap vpn.shahed.biz -sU -sT -p U:1194,T:22,53,443 nmap mail.chorke.org --packet-trace -p 587 -vv -sT tracerout mail.chorke.org
apt install inetutils-traceroute apt install nmap	systemctl status iptables systemctl status nftables	sudo ip6tables-save > /etc/iptables/rules.v6 sudo iptables-save > /etc/iptables/rules.v4
sudo iptables -S FORWARD -v sudo iptables -S OUTPUT -v sudo iptables -S INPUT -v	sudo iptables -L FORWARD -v sudo iptables -L OUTPUT -v sudo iptables -L INPUT -v	sudo iptables -L FORWARD -v --line-numbers sudo iptables -L OUTPUT -v --line-numbers sudo iptables -L INPUT -v --line-numbers
sudo iptables -S -t nat -v sudo iptables -S -t nat	sudo iptables -L -t nat -v sudo iptables -L -t nat	sudo iptables -L -t nat -v --line-numbers sudo iptables -L -t nat --line-numbers
sudo systemctl restart networking sudo iptables -L --line-numbers iptables --version	sudo nmap -sP 192.168.49.0/24 sudo arp -d 192.168.49.100 arp -n	sudo arp -s 192.168.49.100 02:42:c0:a8:31:02 kubectl get nodes -o wide ip route show
nmap vpn.shahed.biz --reason -Pn --top 20 nmap vpn.shahed.biz --reason -Pn -p25,465,587,993	sudo tail -n100 -f /var/log/auth.log sudo tail -n100 -f /var/log/kern.log	sudo cat /etc/shadow|grep nobody last

References

IPTables » The Beginners Guide IPTables » Rules Listing IPTables » Port Forward IPTables » RedHat IPTables » How To IPTables
PostgreSQL OpenVPN Minikube Podman Vagrant VSCode NodeJS Docker MAAS MinIO	Academia JavaEE Workspace in Ubuntu Linux Virtual Display for iPad Pro Ubuntu/Raspberry Pi Linux Containers Localtunnel Remmina ActiveMQ MySQL Nginx Qemu	K8s » CSI Hostpath Driver Linux User Creation CIDR UFW Port