P16. Consider the network setup in Figure 4.25 . Suppose that the ISP instead assigns the router the address 24.34.112.235 and that the network address of the home network is 192.168.1/24. a. Assign addresses to all interfaces in the home network. b. Suppose each host has two ongoing TCP connections, all to port 80 at host 128.119.40.86. Provide the six corresponding entries in the NAT translation ta

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P16. Consider the network setup in Figure 4.25 . Suppose that the ISP instead assigns the router the address 24.34.112.235 and that the network address of the home network is 192.168.1/24.

a. Assign addresses to all interfaces in the home network.

b. Suppose each host has two ongoing TCP connections, all to port 80 at host 128.119.40.86. Provide the six corresponding entries in the NAT translation table.

**Figure 4.25: Network Address Translation (NAT)**

This diagram illustrates the process of Network Address Translation (NAT), highlighting both the flow of data packets and the translation of addresses between a Wide Area Network (WAN) and a Local Area Network (LAN). 

**NAT Translation Table:**

- **WAN side** | **LAN side**
  - 138.76.29.7, 5001 | 10.0.0.1, 3345
  - ...

**Packet Flow and Translation Process:**

1. **Outgoing Request from LAN:**
   - Source (S): 10.0.0.1, Port 3345
   - Destination (D): 128.119.40.186, Port 80
   - Packet flows from the device at 10.0.0.1 through the NAT Router.

2. **Translation at NAT Router (LAN to WAN):**
   - The source address and port are translated from the LAN (10.0.0.1, 3345) to the WAN (138.76.29.7, 5001).
   - This allows the packet to be sent out to the external network.

3. **Incoming Response via WAN:**
   - Source (S): 128.119.40.186, Port 80
   - Destination (D): 138.76.29.7, Port 5001
   - The response returns to the NAT router with these identifiers.

4. **Translation at NAT Router (WAN to LAN):**
   - The destination address and port are translated back from the WAN (138.76.29.7, 5001) to the LAN (10.0.0.1, 3345) to reach the original requesting device.

**Explanation:**

- This process shows NAT’s role in allowing devices within a private network (LAN) to communicate with external networks (WAN) using a single public IP address.
- Each arrow represents a step in data transmission and translation, allowing seamless communication between internal and external networks by modifying IP address and port information as needed.
Transcribed Image Text:**Figure 4.25: Network Address Translation (NAT)** This diagram illustrates the process of Network Address Translation (NAT), highlighting both the flow of data packets and the translation of addresses between a Wide Area Network (WAN) and a Local Area Network (LAN). **NAT Translation Table:** - **WAN side** | **LAN side** - 138.76.29.7, 5001 | 10.0.0.1, 3345 - ... **Packet Flow and Translation Process:** 1. **Outgoing Request from LAN:** - Source (S): 10.0.0.1, Port 3345 - Destination (D): 128.119.40.186, Port 80 - Packet flows from the device at 10.0.0.1 through the NAT Router. 2. **Translation at NAT Router (LAN to WAN):** - The source address and port are translated from the LAN (10.0.0.1, 3345) to the WAN (138.76.29.7, 5001). - This allows the packet to be sent out to the external network. 3. **Incoming Response via WAN:** - Source (S): 128.119.40.186, Port 80 - Destination (D): 138.76.29.7, Port 5001 - The response returns to the NAT router with these identifiers. 4. **Translation at NAT Router (WAN to LAN):** - The destination address and port are translated back from the WAN (138.76.29.7, 5001) to the LAN (10.0.0.1, 3345) to reach the original requesting device. **Explanation:** - This process shows NAT’s role in allowing devices within a private network (LAN) to communicate with external networks (WAN) using a single public IP address. - Each arrow represents a step in data transmission and translation, allowing seamless communication between internal and external networks by modifying IP address and port information as needed.
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