Calin's Humble Scanner - User Guide

## Scan method IGMP

- Finds the IPv4 hosts that are members in a multicast group other then the default one.
- Ability to send IGMPv1, IGMPv2 and IGMPv3 queries.
- This method sends one packet only and waits for the hosts to answer. Unlike the other scan methods, this method does not obey the Max.Wait Time value. Instead it use it's time which is established by the multicast related RFCs. Default value is 10 seconds.

## Parameters

Parameters are specified as follow: `[version [SP groupMulticastIPv4Address [SP destinationMulticastIPv4Address]]]`, where:

- version is 1, 2 or 3, determining the version of IGMP Query. If not specified, the application will send an IGMPv2 general query;
- groupMulticastIPv4Address is either a multicast IPv4 address (224.0.0.0 - 239.255.255.255, for a specific query) or 0.0.0.0 (which coresponds to a general query). If not specified, the default value, 0.0.0.0, will be used;
- destinationMulticastIPv4Address is a multicast IPv4 address used as a destination for the query. If not specified, the default value, 224.0.0.1, will be used;
- SP is a space character.

## Examples

- empty parameter string will generate an IGMPv2 general query;
- 3 will generate an IGMPv3 general query;
- 3 224.0.0.2 will generate an IGMPv3 specific query for the 224.0.0.2 (All Routers on this Subnet) that will be sent with a destination IPv4 multicast address of 224.0.0.1 (All Systems on this Subnet);
- 3 224.0.1.24 224.0.0.2 will generate an IGMPv3 specific query for the 224.0.1.24 (microsoft-ds) that will be sent with a destination IPv4 multicast address of 224.0.0.2 (All Routers on this Subnet).

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