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12.2.8 Configuring Load Sharing Network Address Translation
(LSNAT)
LSNAT is an advanced routing feature that must be enabled with a license key. If you have
purchased an advanced license key, and have enabled routing on the device, you must activate
your license as described in
to purchase an advanced routing license, contact Enterasys Networks Sales.
About LSNAT
As defined in RFC 2391, LSNAT supports network reliability and availability by enabling high
traffic servers to load balance. It allows an IP address and port number to become a Virtual IP
address and port number (VIP), mapped to many devices. When the VIP is seen as a destination
address and destination port number by the LSNAT device, the device traps the packet and then
translates the VIP to a real IP address and port combination. It does this by using a selected
algorithm for choosing from the group of servers addresses, and replaces the VIP with the selected
IP address and port number. For outgoing transmissions, the translation is made from real IP address
and port combination to VIP.
LSNAT Configuration Considerations
The following considerations must be taken into account when configuring LSNAT on Matrix
Series devices:
•
On chassis-based systems, only one router per chassis will be allowed to run LSNAT at a given
time.
•
ALL modules in the chassis must have upgraded memory to 256 MB, and must have an
advanced license activated.
•
A server farm cannot be shared by different virtual servers.
•
When different virtual server IPs (VIPs) share the same real server in different server farms, the
persistence level must be set the same.
•
All real servers in the same server farm should be configured to use the same port.
•
In general, in order to edit or delete a virtual server or real server (serverfarm) configuration, the
devices must be first configured "out of service" (no inservice) before the changes will be
allowed.
Configuring Load Sharing Network Address Translation (LSNAT)
* Advanced License Required *
Section 2.2.4
in order to enable the LSNAT command set. If you wish
Matrix DFE-Platinum and Diamond Series Configuration Guide
IP Configuration Command Set
12-69
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