Chapter 17: Web Hosting Configuration Guide

To set the status of a load balancing server, enter the following command in Enable mode:

Set status of load balancing server.

load-balance set server-status server-ip

<ipaddr/range> server-port<port number> group-name<group name> status updown

Load Balancing and FTP

File Transfer Protocol (FTP) packets require special handling with load balancing, because the FTP PORT command packets contain IP address information within the data portion of the packet. If the FTP control port used is not port 21, it is important for the SSR to know the port number that is used for FTP.

To define an FTP control port (other than port 21) to the load balancing function, enter the following command in Configure mode:

Specify the FTP control port.

load-balance set ftp-control-port <port number>

Allowing Access to Load Balancing Servers

Load balancing causes both source and destination addresses to be translated on the SSR. It may be undesirable in some cases for a source address to be translated; for example, when data is to be updated on an individual server. Specified hosts can be allowed to directly access servers in the load balancing group without address translation. Note, however, that such hosts cannot use the virtual IP address and port number to access the load balancing group of servers.

To allow specified hosts to access the load balancing servers without address translation, enter the following command in Configure mode:

Specify the hosts that can access servers without address translation.

load-balance allow access-to-servers client-ip <ipaddr/range> group-name <group name>

Setting Timeouts for Load Balancing Mappings

A mapping between a host (source) and a load-balancing server (destination) times out after a certain period. After the mapping times out, any server in the load balancing group can be selected. The default timeouts depend upon the session persistence level configured when the load balance group is created. You can specify the timeout for source-destination load balancing mappings.

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SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-05 manual Load Balancing and FTP, Allowing Access to Load Balancing Servers