Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 49)

Brocade Virtual ADX Server Load Balancing Guide 33
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Source NAT
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Enabling source NAT globally
Source NAT allows the Brocade Virtual ADX to use a specific source IP address as the source for
sending packets to real servers, which is useful for operating in a multinetted environment. You can
enable source NAT globally or locally on individual real servers. If you enable source NAT globally,
the feature applies to all real servers. If you enable the feature locally, the Brocade Virtual ADX
performs source NAT only for those real servers. Other locally-attached real servers, on which
source NAT is not enabled, must be in the same subnet as the Brocade Virtual ADX.
To enable source NAT globally, enter the following command.
Virtual ADX(config)#server source-nat
Syntax: [no] server source-nat
NOTE
In a system with a large number of barrel processors (BP), the usable source NAT ports are limited.
The larger the number of BPs that a system has, the lesser number of Source ports available for the
BP. It is suggested that you use the “Enabling Port Allocation” feature when all 64 Source IPs are
used up. Refer to
“Enabling port allocation per real server for source NAT IP” on page 35 and
“Enabling port allocation per real server for source NAT IP” on page 35 for details.
If you are configuring a pair of Brocade Virtual ADX devices for hot-standby (active-standby) HA and
you want to use the same source IP address on each Brocade Virtual ADX, use the server
source-nat-ip command instead.
NOTE
If there are sessions that are currently using the source-nat-ip address and you delete that IP
address, then you should wait till all the sessions are deleted before using the server source-nat-ip
command with the deleted address or before a reload of the Brocade Virtual ADX.
Enabling source NAT on a real server
Source NAT allows the Brocade Virtual ADX to use a source IP address as the source for packets
sent to the real server. Source NAT allows the Brocade Virtual ADX to be in more than one subnet. If
the real server and the Brocade Virtual ADX are in different subnets and not connected by a router
that is multinetted, enable source NAT on the real server.
If you enable source NAT on a real server, the feature applies only to the server. You also can
enable source NAT globally. Refer to
“Enabling source NAT globally” on page 33.
To enable source NAT on a real server, enter commands such as the following.
Virtual ADX(config)#server real-name berto
Virtual ADX(config-rs-berto)#source-nat
Syntax: [no] source-nat
Source NAT is disabled by default.