arpsend8

Usage

Overview

Utility arpsend sends ARP packets on device interface to detect or update neighbours' ARP caches with a given IP.

Commands

Run utility with one of the following commands:

-D

Send broadcast ARP request to detect neighbours with target_ip. You have to specify target_ip (-e option).

-U

Send broadcast ARP request to update neighbours' ARP caches with source_ip. You have to specify source_ip (-i option).

Options

-c count

Number of packets to send. Default is infinity.

-w interval

Interval between packets, in seconds. Default is 1 second.

-i source_ip_address

Set source IP address field in ARP packet.

-e target_ip_address

Set target IP address field in ARP packet. Note that you can specify -e option multiple times to detect many IP addresses in one utility call.

Exit status

arpsend returns 0 upon successful execution. If something goes wrong, it returns an appropriate error code.

1 EXC_USAGE

Usage error

2 EXC_SYSTEM

System error

3 EXC_RECV

ARP reply was received

Examples

To send request on interface eth0 to detect any neighbour computers with IP 192.168.10.200:

   arpsend -D -e 192.168.10.200 eth0

To send request on interface eth0 to update neighbours' ARP caches with IP 192.168.10.200:

   arpsend -U -i 192.168.10.200 eth0

Notes

Interface you use have to be arpable and not be loopback (i.e. /sbin/ip link show interface should show neither NOARP nor LOOPBACK flags in interface parameters).