Network Instruments Observer User Manual

Page 12

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Getting Started with Observer Modes and Tools


Observer® Quick Start Manual

After storing the addresses and network names, Observer will
automatically use the stored names in queries.

1. Click

Tools > Discover Network Names

or the

icon on the Observer


2. Click

Mode Commands > Setup

or the

icon on the Discover

Network Names toolbar.

3. Fill in your IP information or check the “Passively discover IP addresses”


4. Click

Mode Commands > Start Mode

or the

icon on the Discover

Network Names toolbar.

If you have not checked the “Passively Discover IP Addresses” checkbox,

Observer will ARP all addresses twice within the range you’ve specified, then

passively listen for responses. If you’ve chosen to passively discover IP

addresses, Observer will identify each station the first time the station sends

out a packet on the network and add the station’s address to the list.

The advantage of passive discovery is that you don’t have to know what
your local net range is. The disadvantage is that if a station generates
no traffic during the time when Discover Network Names is running,
Observer won’t identify it.

Either way, once the discovery is complete, you can automatically generate IP

aliases for your addresses by clicking the R


IP button and then clicking

the S