先决条件 – ARP、反向 ARP(RARP)、反向 ARP(InARP)、代理 ARP 和免费 ARP
在地址解析协议 (ARP) 中，获取接收方的 MAC 地址。通过ARP，(32位)IP地址映射到(48位)MAC地址。
而在反向地址解析协议 (RARP) 中，IP 地址是通过服务器获取的。通过RARP，48位(48位)MAC地址映射成(32位)IP地址。
来看看ARP和RARP的区别：
| S.NO | ARP | RARP |
|---|---|---|
| 1. | ARP stands for Address Resolution Protocol. | Whereas RARP stands for Reverse Address Resolution Protocol. |
| 2. | Through ARP, (32-bit) IP address mapped into (48-bit) MAC address. | Whereas through RARP, (48-bit) MAC address of 48 bits mapped into (32-bit) IP address. |
| 3. | In ARP, broadcast MAC address is used. | While in RARP, broadcast IP address is used. |
| 4. | In ARP, ARP table is managed or maintained by local host. | While in RARP, RARP table is managed or maintained by RARP server. |
| 5. | In Address Resolution Protocol, Receiver’s MAC address is fetched. | While in RARP, IP address is fetched.
s |
| 6. | In ARP, ARP table uses ARP reply for its updation. | While in RARP, RARP table uses RARP reply for configuration of IP addresses . |
| 7. | Hosts and routers uses ARP for knowing the MAC address of other hosts and routers in the networks. | While RARP is used by small users having less facilities. |