Specifications

48 Barracuda Link Balancer Administrator’s Guide
If the Barracuda Link Balancer firewall is enabled, you can view the firewall log on the Logs >
Firewall Log
page to see rules that have been executed and whether the traffic was dropped or allowed.
Only rules that have the
Log check box selected in their rule entry (under the Firewall tab) are logged
in this way.
Check recent VPN tunnel activity by using the
Logs > VPN Log page.
When any of these logs reaches their predetermined size a new log is started.
To have these logs emailed or sent to an FTP or SMB server on a regular basis, use the Basic >
Reports
page (models 330 and above).
Using a Syslog Server to Centrally Monitor System Logs
Syslog is a standard UNIX/Linux tool for logging messages and is available on all UNIX/Linux
systems. The Barracuda Link Balancer writes to the syslog for link and system events. Use the
Advanced > Syslog page to specify servers to which syslog data is sent.
SNMP Monitoring
Your SNMP monitor or other network management program can query the Barracuda Link Balancer
SNMP agent for WAN link traffic statistics, amount of traffic going to and from the LAN, and
hardware status. You can also receive SNMP traps that are generated if the WAN links become
unavailable or if the Barracuda Link Balancer exceeds certain thresholds such as disk space usage.
To allow SNMP access to the Barracuda Link Balancer, navigate to the
Basic > Administration page.
On that page you can:
• Configure the Barracuda Link Balancer to accept and respond to SNMP queries.
• Update the SNMP community string.
• Set the SNMP version. Version 2c and version 3 are supported.
• Enter a range of IP addresses that are allowed to connect to the Barracuda Link Balancer using
SNMP.
• Configure IP addresses that will be sent SNMP traps.
An SNMP monitor can access the Barracuda Link Balancer via any of the WAN or LAN IP addresses,
although using the LAN is recommended in case one of the WAN links goes down.
Obtain and import these two MIB files to your SNMP monitor:
• The Barracuda Link Balancer MIB
• The Barracuda Reference MIB (standard across all Barracuda Networks products).
The MIB files are located on the Barracuda Link Balancer and can be obtained by replacing [LB IP]
in the following URLs with a management IP address of your Barracuda Link Balancer:
• http://[LB IP]:8000/Barracuda-BWB-MIB.txt
• http://[LB IP]:8000/Barracuda-REF-MIB.txt