Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 363)

In releases of EQ/OS previous to Version 10, an outbound NAT address was specified on a per-server basis. In

EQ/OS 10, outbound NAT addresses are configured on subnets -- the specified outbound NAT address is used for

any server connection originating on that subnet.

Configuring Outbound NAT (CLI)

From the global context, enter the following command to specify an outbound NAT IP address for a subnet:

eqcli > vlan name subnet name outbound_nat IP_address

Configuring Outbound NAT (GUI)

1. Display the configuration tabs for the subnet on which you want to add an outbound NAT address, by

following this click path in the left frame object tree:

VLANs > VLAN name > (expand subnets) > Subnet name

2. In the right frame configuration tab, enter an existing IP address (one that is already defined on Equalizer,

such as the subnet IP address) in the Outbound NAT Address text box.

3. Click Commit.

Direct Server Return (DSR)

In a typical load balancing scenario, server responses to client requests are routed through Equalizer on their way

back to the client. Equalizer examines the headers of each response and may insert a cookie, before sending the

server response on to the client.

In a Direct Server Return (DSR) configuration, the server receiving a client request responds directly to the client

IP, bypassing Equalizer. Because Equalizer only processes incoming requests, cluster performance is

dramatically improved when using DSR in high bandwidth applications, especially those that deliver a significant

amount of streaming content. In such applications, it is not necessary for Equalizer to receive and examine the

server’s responses: the client makes a request and the server simply streams a large amount of data to the client.

DSR is supported on Layer 4 TCP and UDP clusters only, and is not supported for FTP clusters (Layer 4 TCP

clusters with a start port of 21).

DSR configurations are often configured on a single VLAN or subnet, where the cluster IP and the server IPs are

all on the internal interface. Refer to "Configuring Direct Server Return" on page 313 for details.

DSR can also be used in multiple VLAN configurations, although this is less common. Cluster IP addresses are on

one VLAN/subnet, while server IP addresses are on another VLAN/subnet.

In any DSR configuration, note that the incoming client traffic is assumed to originate on the other side of the

gateway device for the subnets on which Equalizer and the servers reside. The servers will usually have their

default gateway set to something other than Equalizer so that they can respond directly to client requests.

In DSR configurations where a client device resides on the same side of the gateway as the DSR servers, there is

the possibility that the servers will receive the ARP (Address Resolution Protocol) request for the virtual cluster IP

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Coyote Point Systems Equalizer Especificaciones Pagina 363