Скачать или смотреть 43. What is Proxy ARP | How Proxy ARP Works | Type of ARP | CCNA 200-301 Full Course | Part - 3

Proxy ARP, which stands for Proxy Address Resolution Protocol, is a network protocol used in computer networks to enable one device to act as a proxy for another device to answer ARP requests on its behalf. ARP, or Address Resolution Protocol, is used to map IP addresses to MAC (Media Access Control) addresses on a local network. When a device on a network needs to communicate with another device, it needs to know the MAC address of the target device in order to send data to it at the link layer.

Proxy ARP is primarily used in situations where devices are not on the same local network segment but need to communicate with each other. In a typical ARP operation, a device sends an ARP request to find the MAC address associated with a specific IP address. If the device is not on the local network segment, the ARP request will not be able to reach it directly. This is where Proxy ARP comes into play.

Here's how Proxy ARP works:

1. A device (Device A) on a network wants to communicate with another device (Device B) that is not on the same local network segment. Device A knows the IP address of Device B but not its MAC address.

2. Device A sends an ARP request to find the MAC address associated with Device B's IP address. This ARP request is broadcast on the local network.

3. The router (or another device) that is configured to perform Proxy ARP for Device B receives the ARP request.

4. The Proxy ARP device, recognizing that it is acting as a proxy for Device B, responds to the ARP request by providing its own MAC address as if it were the MAC address of Device B. It essentially says, "I know how to reach Device B; send the data to me."

5. Device A receives the ARP response and stores the MAC address of the Proxy ARP device, thinking it is the MAC address of Device B.

6. Device A can now send data to the Proxy ARP device, which will forward the data to Device B as needed.

Proxy ARP is useful in situations like network segmentation, where devices are separated by routers or subnets. It allows devices on different network segments to communicate, as the router acting as a proxy can forward data between the two segments. However, it can introduce some complexity and potential security concerns, so it should be used with caution and in situations where it is necessary.

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