Cisco Cisco Firepower Management Center 2000 开发者指南

Version 5.3

Sourcefire 3D System eStreamer Integration Guide

275

Understanding Discovery & Connection Data Structures

Host Discovery and Connection Data Blocks

Chapter 4

The 

 table describes the 

components of the MAC Address Specification data block.

Address Specification Data Block

The Address Specification data block is used to contain lists of IP address range 

specifications and MAC address specifications. The Address Specification data 

block has a block type of 64 in the series 1 group of blocks.
The following diagram shows the basic structure of an Address Specification data 

block:

MAC Address Specification Data Block Fields 

MAC Address 

Specification 

Block Type

uint32

Initiates a MAC Address Specification data 

block. This value is always 63.

MAC Address 

Specification 

Block Length

uint32

Total number of bytes in the MAC Address 

Specification data block, including eight bytes 

for the MAC Address Specification block type 

and length fields, plus the number of bytes of 

MAC address specification data that follows.

MAC Address 

Blocks 1 - 6

uint8

The blocks of the MAC address in sequential 

order.

Byte

0

1

2

3

Bit

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Address Specification Data Block Type (64)

Address Specification Block Length

IP Address 

Rang

e 

Blocks

Generic List Block Type (31)

Generic List Block Length

IP Address Range Specification Data Blocks...

MA

C 

Address  Blocks

Generic List Block Type (31)

Generic List Block Length

MAC Address Specification Data Blocks...