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LAN Analyzer and Protocol Decoder - CommView

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Introduction
About CommView
What's New
Using the Program
Overview
Selecting Network Interface for Monitoring
Latest IP Connections
Packets
Logging
Viewing Logs
Rules
Advanced Rules
Alarms
Reconstructing TCP Sessions
Reconstructing UDP Streams
Searching Packets
Statistics and Reports
Using Aliases
Packet Generator
Visual Packet Builder
NIC Vendor Identifier
Scheduler
Using Remote Agent
Using RPCAP
Capturing Loopback Traffic
Port Reference
Setting Options
Frequently Asked Questions
VoIP Analysis
Introduction
Working with VoIP Analyzer
SIP and H.323 Sessions
RTP Streams
Registrations
Endpoints
Errors
Call Logging
Reports
Call Playback
Viewing VoIP Logs
Working with Lists in VoIP Analyzer
NVF Files
Advanced Topics
Capturing High Volume Traffic
Working with Multiple Instances
Running CommView in Invisible Mode
Command Line Parameters
Exchanging Data with Your Application
Custom Decoding
CommView Log Files Format
Sales and Support

NIC Vendor Identifier

The first 24 bits of a network card's MAC address uniquely identify the network card's vendor. This 24-bit number is called the OUI ("Organizationally Unique Identifier").  The NIC Vendor Identifier is a tool that allows you to look up a vendor name by MAC address. To look up a vendor name, click Tools =>NIC Vendor Identifier, enter a MAC address, and click Find. The vendor's name will be displayed.  By default, CommView replaces the first three octets of the MAC address by the adapter vendor name in the Packets tab. This behavior may be changed by unchecking the Display vendor names in MAC addresses checkbox in the General tab of the program Options dialog.

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The list of vendors is contained in the MACS.TXT file located in the CommView application folder. You can manually edit this list to add/modify information.