1. COMPUTER NETWORKS
CS610
Lecture-39
Hammad Khalid Khan

2. Review Lecture 38 NAT Translation Table NAPT TCP Splicing Twice NAT
CAT
NAT at Home

3. Chapter 27
IP ROUTING

4. Terminology Forwarding Refers to datagram transfer
Performed by host or router
Uses routing table
Routing
Refers to propagation of routing information
Performed by routers
Inserts / changes values in routing table

5. Two Forms of Internet Routing
Static Routing
Table initialized when system boots
No further changes
Dynamic Routing
Routing software learns routes and updates table
Continuous changes possible

6. Static Routing Used by most Internet hosts
Typical routing table has two entries:
Local network → direct delivery
Default → nearest router

7. Example of Static Routing

8. Dynamic Routing Used by IP routers Requires special software
Each router communicates with neighbors
Pass routing information
Uses Route Propagation Protocol

9. Example of Route Propagation

10. Summary IP Routing (Ch. 27) Static Routing Vs. Dynamic Routing
Static Routing in Hosts and a Default Route
Dynamic Routing and Routers