A private network uses a NAPT device at public IP address 197.196.100.80 The computers in the network use addresses of the form 10.0.0.x/22. Suppose that computer inside the NATed network sends a request with Source address: 10.0.1.10 Source port: 530 Destination address: 60.25.40.10 Destination port: 20 The next available port number on the NAPT device is 10123. PART 1: What source and destination information do the request packet headers contain when the request is sent out by the sending host? Source address: [ Select ] 10123 60.25.40.10 530 197.196.100.80 10.0.1.10 20 Source port : [ Select ] 10123 10.0.1.10 530 60.25.40.10 197.196.100.80 20 Destination address: 60.25.40.10 Destination port : [ Select ] 10.0.1.10 530 20 197.196.100.80 10123 60.25.40.10 PART 2: What source and destination information do the request packet headers contain when the request is sent out by the NAT box? Source address: [ Select ] 60.25.40.10 20 10.0.1.10 197.196.100.80 530 10123 Source port : [ Select ] 60.25.40.10 10123 10.0.1.10 197.196.100.80 20 530 Destination address: [ Select ] 197.196.100.80 530 60.25.40.10 10.0.1.10 10123 20 Destination port : [ Select ] 10.0.1.10 60.25.40.10 10123 20 530 197.196.100.80 PART 3: What source and destination information do the response packet headers contain when the response is received by the NAT box? Source address: [ Select ] 60.25.40.10 10.0.1.10 10123 197.196.100.80 20 530 Source port : [ Select ] 60.25.40.10 20 10123 530 10.0.1.10 197.196.100.80 Destination address: [ Select ] 60.25.40.10 197.196.100.80 530 20 10.0.1.10 10123 Destination port : [ Select ] 530 60.25.40.10 10123 20 10.0.1.10 197.196.100.80 PART 4: What source and destination information do the response packet headers contain when the response is received by the original sending host? Source address: [ Select ] 197.196.100.80 20 10.0.1.10 530 60.25.40.10 10123 Source port : [ Select ] 530 60.25.40.10 20 10123 197.196.100.80 10.0.1.10 Destination address: [ Select ] 197.196.100.80 60.25.40.10 10123 530 20 10.0.1.10 Destination port : 530多重下拉选择题
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NAT : Network Address Translation In the following home network, host 192.168.5.1 sends a HTTP request to a web server of IP address 129.112.40.6, and receives a HTTP response. Relating to this request, the NAT table at the home router has the following entry: WAN side addr WAN side port LAN side addr LAN side port 130.155.169.8 6123 192.168.5.1 3456 Complete the following table to show what you would observe at the home router's WAN interface point A and host 192.168.5.1's network interface point C. Datagram Observed at Source IP addr Source port Destination IP addr Destination port HTTP request point C [Fill in the blank] 3456 [Fill in the blank] 80 HTTP request point A [Fill in the blank] 6123 [Fill in the blank] 80 HTTP response point A [Fill in the blank] 80 [Fill in the blank] 6123 HTTP response point C [Fill in the blank] 80 [Fill in the blank] 3456
Ch08. The number of simultaneous connections from the LAN behind and NAT-enabled router is limited to 4 (one for HTTP server, one for FTP server, one for SMTP server, and one for DNS).
The number of simultaneous connections from the LAN behind an NAT-enabled router is unlimited.
13- NAT (Network Address Translation) replacing the source IP address and the port number of every outgoing datagram to a new IP address (NAT IP address) and a new port number.
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