Fortinet FortiVoice GO08, Руководство администратора

Страница: 31 / 66

Fortinet Technologies Inc. Page 31 FortiVoice Gateway 5.3.6 Administration Guide
Packet sniffing tells you what is happening on the network at a low level. This can be very useful
for troubleshooting problems, such as:
• finding missing traffic
• seeing if sessions are setting up properly
• locating ARP problems such as broadcast storm sources and causes
• confirming which address a computer is using on the network if they have multiple
addresses or are on multiple networks
• confirming routing is working as you expect
• intermittent missing PING packets.
If you are running a constant traffic application such as ping, packet sniffing can tell you if the
traffic is reaching the destination, how the port enters and exits the FortiVoice Gateway, if the
ARP resolution is correct, and if the traffic is returning to the source as expected. You can also
use packet switching to verify that NAT or other configuration is translating addresses or routing
traffic the way that you want it to.
Before you start sniffing packets, you need to have a good idea of what you are looking for.
Sniffing is used to confirm or deny your ideas about what is happening on the network. If you try
sniffing without a plan to narrow your search, you could end up with too much data to effectively
analyze. On the other hand, you need to sniff enough packets to really understand all of the
patterns and behavior that you are looking for.
To capture voice and fax packets
1. Go to System > Network > Traffic Capture.
Figure 10: Traffic capture list
2. Click New .
3. Enter a prefix for the file generated from the captured traffic. This will make it easier to
recognize the files.
4. Enter the time period for performing the packet capture.
5. If you choose SIP or Use protocol for Filter , from the Available peers field, select the
extension or trunk of which you want to capture the voice packets and click -> to move them
into the
Selected peers field. You can select up to 3 peers.
GUI field Description
Stop Click to stop the packet capture.
Download When the capture is complete, click Download to save the packet
capture file to your hard disk for further analysis.
Name The name of the packet capture file.
Status The status of the packet capture process, Complete or Running .
Size The size of the packet capture file.