README.md

ARP Plugin

This plugin manages IPs and announces them on the local network using ARP.

Environment Variables

• INTERFACE: Name of the interface where LinK should add and remove IPs.
• ARP_GRATUITOUS_COUNT: Number of gratuitous ARP packets sent when an IP becomes ACTIVATED.

JSON Configuration

Name	Type	Optional	Description
ip	string	no	IP address to manage using CIDR notation

Example

{
  "ip": "10.20.30.40/32"
}

How do we bind the IPs?

To add an interface, LinK adds the IP to the configured interface and send an unsolicited ARP request on the network (see Gratuitous ARP).

This is the equivalent of:

ip addr add MY_IP dev MY_INTERFACE
arping -B -S MY_IP -I MY_INTERFACE

To unbind an IP, LinK removes it from the interface.

This is the equivalent of:

ip addr del MY_IP dev MY_INTERFACE