• Autoconfiguration Automatic configuration of networking stack
• QoS Network Quality of Service Algorithms
  • Packet Scheduling
  • Packet Dropping
  • Queueing Disciplines
  • Packet Classifiers
  • TCP Congestion Control
  • RSVP Bandwidth reservation mechanisms
• TCP TCP extensions

Q: Why can I ping an IP address when the interface is down?
A: Linux uses a “host based” addressing model, IP addresses are owned by the host, not individual interfaces. So as long as the IP address is configured to some interface, we will accept packets destined to that IP address as ours.