harmony 鸿蒙arp
arp
Command Function
Hosts on an Ethernet communicate with each other using MAC addresses. IP addresses must be converted into MAC addresses to enable communication between hosts on a LAN (Ethernet). To achieve this purpose, the host stores a table containing the mapping between IP addresses and MAC addresses. This table is called an Address Resolution Protocol (ARP) cache table. Before sending an IP packet to a LAN, the host looks up the destination MAC address in the ARP cache table. The ARP cache table is maintained by the TCP/IP stack. You can run the arp command to view and modify the ARP cache table.
Syntax
arp
arp [-i IF] -s IPADDR HWADDR
arp [-i IF] -d IPADDR
Parameters
Table 1 Parameter description
Parameter | Description | Value Range |
---|---|---|
No parameter | Prints the content of the ARP cache table. | N/A |
-i IF | Specifies the network port. This parameter is optional. | N/A |
-s IPADDR HWADDR |
Adds an ARP entry. The second parameter is the IP address and MAC address of the other host on the LAN. | N/A |
-d IPADDR | Deletes an ARP entry. | N/A |
Usage Guidelines
The arp command is used to query and modify the ARP cache table of the TCP/IP stack. If ARP entries for IP addresses on different subnets are added, the protocol stack returns a failure message.
This command can be used only after the TCP/IP protocol stack is enabled.
Example
Run arp.
ARP cache table information:
OHOS # arp
Address HWaddress Iface Type
192.168.1.10 E6:2B:99:2C:4B:20 eth0 static
Table 2 Parameter description
Parameter | Description |
---|---|
Address | IPv4 address of the network device. |
HWaddress | MAC address of the network device. |
Iface | Name of the port used by the ARP entry. |
Type | Whether the ARP entry is dynamic or static. A dynamic ARP entry is automatically created by the protocol stack, and a static ARP entry is added by the user. |
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