1. Hands On Networking NAT and Load Balancing Ram P Rustagi, ISE Dept rprustagi@pes.edu Jnana Sagar, CSE Dept June 30, 2012

2. 2 Course contents General Networking Overview –Network config and tools/utilities Building (IPv4) routing networks Studying ICMP Using ARP to advantage NAT and load balancing Installing/configuring Network applications –DHCP, DNS, Apache WS Network security issues Bandwidth Management, Queuing Ipv6: Routing, working with IPv4 networks Socket Programming WiFi Access Software Defined Network Assessment, Feedback 2

3. 3 NAT –Setting up NAT/NAPT –DNAT vs SNAT –NAT with load balancing Load balancing techniques –WE-1 NAT for outgoing access (SNAT) –WE-2 NAT for incoming access (DNAT) –Opening firewall holes –WE-3 NAT with load balancing 3

4. 4 NAT WE-1: SNAT implementation –Ha sends data to Hb –R1 implements SNAT changes the source IP address to 172.16.2.1 from 172.16.1.1 4

5. 5 NAT WE-2: DNAT –Used when server to be given public access is inside NAT –R2 implements DNAT –Changes destination IP address E.g. 172.16.2.200 is changed to 172.16.3.201 5

6. 6 NAT WE-3 –Router R1 will do DNAT Sends packets to different servers as per Load balancing DNA consists of multiple destination ranges 6