Understanding Load Balancing - Cisco FirePOWER ASA 5500 series Configuration Manual

Chapter 29 Setting General IPSec VPN Parameters
You can have the browser automatically start an application by including the application name at the end
Note
of the URL; for example:
To define a set of client-update parameters for a particular ipsec-ra tunnel group, do the following. In
Step 3
tunnel-group ipsec-attributes mode, specify the tunnel-group name and its type, the URL or IP address
from which to get the updated image, and a revision number. If the user's client's revision number
matches one of the specified revision numbers, there is no need to update the client; for example, for a
Windows client:
hostname(config)# tunnel-group remotegrp type ipsec-ra
hostname(config)# tunnel-group remotegrp ipsec-attributes
hostname(config-tunnel-ipsec)# client-update type windows url https://support/updates/
rev-nums 4.6.1
hostname(config-tunnel-ipsec)#
Optionally, you can send a notice to active users with outdated Windows clients that their client needs
Step 4
updating. For these users, a pop-up window appears, offering them the opportunity to launch a browser
and download the updated software from the site that you specified in the URL. The only part of this
message that you can configure is the URL. (See Step 2 or 3.) Users who are not active get a notification
message the next time they log on. You can send this notice to all active clients on all tunnel groups, or
you can send it to clients on a particular tunnel group. For example, to notify all active clients on all
tunnel groups, you would enter the following command in privileged EXEC mode:
hostname# client-update all
hostname#
If the user's client's revision number matches one of the specified revision numbers, there is no need to
update the client, and no notification message is sent to the user. VPN 3002 clients update without user
intervention and users receive no notification message.
If you specify the client-update type as windows (specifying all Windows-based platforms) and later
Note
want to enter a client-update type of win9x or winnt for the same entity, you must first remove the
windows client type with the no form of the command, then use new client-update commands to specify
the new client types.

Understanding Load Balancing

If you have a remote-access configuration in which you are using two or more security appliances or
VPN Concentrators connected on the same network to handle remote sessions, you can configure these
devices to share their session load. This feature is called load balancing. To implement load balancing,
you group together logically two or more devices on the same private LAN-to-LAN network, private
subnet, and public subnet into a virtual cluster.
All devices in the virtual cluster carry session loads. Load balancing directs session traffic to the least
loaded device in the cluster, thus distributing the load among all devices. It makes efficient use of system
resources and provides increased performance and high availability.
One device in the virtual cluster, the virtual cluster master, directs incoming traffic to the other devices,
called secondary devices. The virtual cluster master monitors all devices in the cluster, keeps track of
how busy each is, and distributes the session load accordingly. The role of virtual cluster master is not
OL-10088-01
https://support/updates/vpnclient.exe.
Cisco Security Appliance Command Line Configuration Guide
Understanding Load Balancing
29-5