In this section:
The SBC performs Packet Capture using 'tcpdump' and allows the captured file to be downloaded. The following section describes how to capture packets and download them.
Performing a Media packet capture with no host filters, or against hosts terminating multiple calls can impact traffic and cause current or future calls to fail, or to experience other problems.
Performing a long duration capture outside of a maintenance window can adversely impact traffic, and should be avoided when possible.
For
You must insert either an ASM or external USB into the
The Packet Capture feature is intended for short duration packet captures. For that reason, a maximum duration of 120 minutes (2 hours) is permitted.
The Enable Packet Capture option (available from the Packet Capture menu bar) enables the packet capture capability in the
Packet Capture applies to both SBC 1000/2000 and SBC SWe Lite; differences in the configuration fields displayed are noted below.
Functional differences include:
All screen captures reflect an SBC 1000/2000.
To enable packet capture:
In the left navigation bar, select
For
From the menu bar, click Enable Packet Capture.
Enable Packet Capture
At the Warning note, click OK.
Packet Capture is enabled. Refer to Start Packet Capture.
Packet Capture must be enabled before capturing packets. Refer to Enable Packet Capture.
To view Alarm/Event history logs for Packet Capture, access the Diagnostics tab and click Logs > Alarm/Event History.
To capture T.38 Fax, enable RTP Media and add the Host 1 and Host 2 IP addresses of the next hop neighbor in Media SDP.
The Start Capture option (available from the Packet Capture menu bar) enables the
To start capturing packets:
In the left navigation bar, select
From the menu bar, click Start Capture.
Start Capture
Packet Capture Options
Click OK.
The Packet Capture status turns to In Progress.
Packet Capture in Progress
Specifies the network interface from which the packets will be captured.
This field applies to SBC 1000/2000 only.
Specifies a second network interface from which the packets will be captured for a media packet capture. This field displays when the Media field is set to True.
Specifies the IP version of the interface from which the packets will be captured. Valid options: IPv4, IPv6 or Both.
This field applies to SBC 1000/2000 only.
Specifies whether or not to capture RTP/RTCP Packets.
Valid options: True (captures RTP/RTCP packets) or False (does not capture RTP/RTCP packets). Default entry: False.
Notes:
This field applies to SBC 1000/200 only.
Specifies whether or not to capture DSP/CSME packets.
Valid options: True (captures DSP/CSME packets) or False (does not capture DSP/CSME packets). Default entry: False.
Notes:
Specifies whether or not to capture LDAP Packets.
Valid options: True (captures LDAP packets) or False (does not capture LDAP packets). Default entry: False.
The Media (RTP/RTCP), DSP/CSME and TCP/UDP Ports fields display only when each field for Active Directory (Active Directory, HTTP/HTTPS, or All Other Protocols) is set to False.
Specifies whether or not to capture HTTP/HTTPS packets.
Valid options: True (captures HTTP/HTTPS packets) or False (does not capture HTTP/HTTPS packets). Default entry: False.
The TCP/UDP Ports field displays only when each field for Active Directory (Active Directory, HTTP/HTTPS, and All Other Protocols) is set to False.
Specifies whether or not to capture all other packet types not defined above.
Valid options: True (captures all other packet types) or False (does not capture all other packet types). Default entry: False.
The TCP/UDP Ports field displays only when each field for Active Directory (Active Directory, HTTP/HTTPS, and All Other Protocols) is set to False.
Specifies the port or ports used to capture packets. Configure a maximum of four comma-separated port numbers.
Valid range: 1 - 665535.
The TCP/UDP Ports field displays only when each field for Active Directory (Active Directory, HTTP/HTTPS, or All Other Protocols) is set to False.
Specifies a unique host from which to capture packets. Host is specified by IP Address or FQDN.
Valid range: 1 - 256 ASCII characters.
Specifies the whether the captured packets are being sent to the host or received from the host, or both.
Valid options: Transmit, Receive, or Transmit and Receive. Default option: Transmit and Receive.
Note: The Host #1 Direction field is visible only when an IP address is specified for the Host #1 field.
Specifies a unique host from which to capture packets. Host is specified by IP Address or FQDN.
Valid range: Range: 1 - 256 ASCII characters
Specifies the whether the captured packets are being sent to the host or received from the host, or both.
Valid options: Transmit, Receive, or Transmit and Receive. Default option: Transmit and Receive.
Note: This field is visible only if an address has been entered in Host #2.
Specifies the maximum size of the individual packets to be captured.
Valid range: 100 - 1600 Bytes (default: 1600).
Specifies whether or not the SBC overwrites capture files in round robin fashion or not when the maximum file size has been reached.
Valid options: True (SBC overwrites capture files) or False (SBC does not overwrite capture files). Default option: False.
A maximum duration of 120 minutes (2 hours) is permitted for packet capture.
Specifies the duration of the capture in minutes. The maximum value represents 2 hours.
Valid range: 1 - 120 (default: 10).
The Stop Packet capture feature is optional; this option stops the packet capture early (before the packet capture reaches the time limit set in the Duration field).
To stop capturing packets:
In the left navigation bar, select
From the menu bar, click Stop Capture.
Stop Capture Option
The Packet Capture stops.
Packet Capture Stops
The Restart Packet capture feature is optional; use this option to repeat or restart the last packet capture performed.
To restart or repeat the last packet capture:
From the menu bar, click Restart Last Capture.
Restart Last Capture Option
Click the appropriate field to change any packet capture options that need to change.
Packet Capture Options
Click OK.
The Packet Capture status turns to In Progress.
Packet Capture in Progress
Once the packet capture has stopped, the captured file will appear in the table List of Captured Files.
If you need to stop the packet capture early, from the menu bar, click Stop Capture.
To download captured files:
From the List of Capture Files table, next to the desired file, click Download.
Capture Files
Select the appropriate location to save the file. Click OK.
Save File
Only one packet capture can be downloaded at a time. Depending on the size of the file and network connection, a download can take several minutes.
The List of Packet Capture Files allows you to delete packet capture files from the
To delete packet capture files:
From the List of Packet Capture Files, click the check box on the left of the filename of the packet capture file you want to delete to select it. To delete multiple files, click multiple check boxes. To delete all files, click the check box at the top of the column.
List of Packet Capture Files
The Move and USB options are not supported in the SBC SWe Lite.
If the file location for the packet capture is Internal or an ASM, and the system has an external USB present and available, an additional option, Move, will appear under the Action column. The Move action relocates the packet file to the external USB, which can then be removed and taken to a PC.
The packet capture can only be saved on the internal flash for SBC 2000.
To move captured files:
From the List of Capture Files table, next to the desired file, click Move.
List of Capture Files
The following lists the limitations of Packet Capture.
If Protocol Filters Active Directory, HTTP/HTTPS, or All Other Protocols are set to True, the following options will be hidden and no longer configurable:
DSP/CSME
If any TCP/UDP Ports are entered, the following options will be hidden and no longer configurable:
For