Chapter 9: Networking

Network Info

ip addr show
ip route show
ss -tuln
ping -c 4 host
traceroute host
dig domain.com

Firewall – UFW (Ubuntu)

sudo ufw enable
sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw status verbose

Firewall – firewalld (RHEL)

sudo firewall-cmd --add-service=http --permanent
sudo firewall-cmd --reload
sudo firewall-cmd --list-all

SSH and File Transfer

ssh user@host
ssh -i key.pem user@host
scp file user@host:/path/
rsync -avz src/ user@host:/dst/

Notes

• ss replaces netstat
• ip replaces ifconfig/route
• UFW=Ubuntu, firewalld=RHEL