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HP VPN Firewall Appliances High Availability Configuration Guide

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To implement server load balancing, enable virtual fragment reassembly on the zone to which the
interfaces that process LB packets belong. For more information, see "Managing sessions."
To implement forced load balancing of server load balancing, enable virtual fragment reassembly on the
zone to which the interfaces that process LB packets belong. For more information, see "Managing
sessions."
NOTE:
For an LB device configured with DR-mode server load balancing, you must select Firewall > Session
Table > Configuration from the navigation tree to enable unidirectional traffic detection. For more
information, see
Access Control Configuration Guide
.
Configuring public parameters
1. Select High Reliability > Load Balance > Public Setting from the navigation tree.
The public parameter configuration page appears.
Figure 96 Public parameter configuration
2. Set whether to enable the saving last hop information function.
Enabling this function makes sure responses can be returned on the original path. This function
must be enabled on level 2 LB devices in firewall load balancing.
3. Click Apply.
Configuring a health monitoring method
Load balancing supports multiple health monitoring types. This section describes only the types
supported by server load balancing and physical links. The following health monitoring types, unless
otherwise stated, are only supported by server load balancing.
• ARP—Monitors the availability of a server through ARP.
• DNS—Monitors the availability of a DNS server through DNS.
• FTP—Monitors the availability of an FTP server through FTP.
• HTTP—Monitors the availability of an HTTP service through HTTP access.
• ICMP—Monitors the reachability of a server by sending ICMP messages.
• SIP—Monitors the availability of a SIP server through the SIP application.
• SNMP—Monitors the availability of an SNMP server through SNMP.
• TCP—Monitors the availability of an application port by establishing TCP connections.
• RTSP—Monitors the availability of an RTSP server through RTSP.