ARP

Description

This command can be used to query the internal ARP table and to delete all of its entries. ARP means Address Resolution Protocol, which is a protocol that provides mapping from IP- to Ethernet-Adresses. The ARP? command prints out one or more lines, including the broadcast address. Each line shows six hexadecimal numbers separated by colons, a hyphen and four decimal numbers separated by dots. The part before the hyphen is the Ethernet-Address and that after the hyphen is the corresponding IP-Address. The ARP CLEAR command simply deletes all stored ARP entries, this means, that the module issues an ARP query to get the MAC address of the recipient, before the next IP packet can be sent.

Parameters

ARP? does not need any arguments. ARP must be followed by CLEAR.

Return Value

ARP?: The output is always ERR_OK (0).
ARP: ERR_OK(0) or ERR_ARGUMENT(4) if the argument is not CLEAR

Example

ARP?

Example Output

ff:ff:ff:ff:ff:ff - 255.255.255.255
0:c:41:9d:2f:62 - 192.168.0.1

Remarks

ARP and ARP? are only available on module that have a network interface (such as WLAN or Ethernet)