IPPacket Event

Fired whenever a packet is received.

Syntax

type TIPPacketEvent = procedure IPPacket(Sender: TObject; const SourceAddress: String; SourcePort: Integer; const DestinationAddress: String; DestinationPort: Integer; IPVersion: Integer; TOS: Integer; Id: Integer; Flags: Integer; Offset: Integer; TTL: Integer; Checksum: Integer; IPProtocol: Integer; Payload: String) of object;
property OnIPPacket: TIPPacketEvent read FOnIPPacket write FOnIPPacket;

Remarks

When Active is True, the component will listen for network traffic. For each packet sent across the interface in LocalHost, the component will parse the packet and fire an IPPacket event with the header fields and payload. The parameters are defined as follows:

SourceAddress	The IP address of the originating host in IP dotted format.
DestinationAddress	The IP address of the destination host in IP dotted format.
IPVersion	The IP protocol version being used by this packet.
TOS	The type of service being used by this packet.
Id	The packet id used to identify and track packets.
Flags	Flags relating to the status of the packet and desired responses.
Offset	The fragment offset of this packet in relation to larger data.
TTL	The time to live for this packet.
IPProtocol	The IP protocol used in the payload.
Payload	The data field of the IP packet. This field may contain extra IP headers, depending upon the IP protocol used to create it.

TOS

Bit 0, 1, 2	Precedence (see below)
Bit 3	Delay (0 = Normal, 1 = Low)
Bit 4	Throughput (0 = Normal, 1 = High)
Bit 5	Reliability (0 = Normal, 1 = High)

Precedence

000	Routine
001	Priority
010	Immediate
011	Flash
100	Flash Override
101	CRITIC/ECP
110	Internetwork Control
111	Network Control

Flags

Bit 0	Always zero
Bit 1	Don't Fragment (0 = May Fragment, 1 = Don't Fragment)
Bit 2	More Fragments (0 = Last Fragment, 1 = More Fragments)

IPProtocol - for a full list, visit www.iana.org.

1	ICMP
2	IGMP
4	IP
6	TCP
17	UDP