3. (20 points) Assume you are in a private network connected to the Internet via a router. Your node's IP address is 192.168.45.121/28 Net ID in decimal? Range of valid IPs? to Which IP address is used for the router interface? The router has another interface connected to the Internet. That public IP address is 144.37.12.45 Node1 (192.168.45.121 port 3003) sends an HTTP request to Google server whose IP address is 54.23.130.30 (port 80), and Google server replies. Node2 (192.168.45.125 port 3003) sends an SMTP request to Amazon mail server whose IP address is 145.23.170.92 (port 25), and Amazon mail server replies. Create port numbers at router starting from 6200 Fill in the blanks in the picture below. Enter the IP addresses and ports for packets' sources and destinations at each step and also in NAT table. Enter the IP addresses asked in the picture (22 blanks) NAT translation table WAN side addresses LAN side addresses Public IP, Public Port Private IP, Private Port S1 (IP, port): D1 (IP, port) S1 (IP, port): D1 (IP, port) Node1 Google S1 (IP, port): D1 (IP, port) LAN'S S1 (P, port): 3routerD1 (IP, port): 4 IP: Switch Amazon S1 (IP, port) D1 (IP, port): S1 (IP, port): D1 (IP, port): Node2 S1 (IP port): D1 (IP, port): S1 (IP, port): D1 (IP, port) 4 3. (20 points) Assume you are in a private network connected to the Internet via a router. Your node's IP address is 192.168.45.121/28 Net ID in decimal? Range of valid IPs? to Which IP address is used for the router interface? The router has another interface connected to the Internet. That public IP address is 144.37.12.45 Node1 (192.168.45.121 port 3003) sends an HTTP request to Google server whose IP address is 54.23.130.30 (port 80), and Google server replies. Node2 (192.168.45.125 port 3003) sends an SMTP request to Amazon mail server whose IP address is 145.23.170.92 (port 25), and Amazon mail server replies. Create port numbers at router starting from 6200 Fill in the blanks in the picture below. Enter the IP addresses and ports for packets' sources and destinations at each step and also in NAT table. Enter the IP addresses asked in the picture (22 blanks) NAT translation table WAN side addresses LAN side addresses Public IP, Public Port Private IP, Private Port S1 (IP, port): D1 (IP, port) S1 (IP, port): D1 (IP, port) Node1 Google S1 (IP, port): D1 (IP, port) LAN'S S1 (P, port): 3routerD1 (IP, port): 4 IP: Switch Amazon S1 (IP, port) D1 (IP, port): S1 (IP, port): D1 (IP, port): Node2 S1 (IP port): D1 (IP, port): S1 (IP, port): D1 (IP, port) 4
