Brocade Communications Systems 12.4.00 manual Configuring null host names, Configuration example

Proxy for DNS server 1

Syntax: host-info <host-name>alias <alias-name>

NOTE

Make sure you configure the alias only after configuring the zone and the host application the alias is for, as shown in the example above. In addition, make sure you specify the fully-qualified name for the alias (for example, “www.gslb.brocade.com” instead of “www.gslb”.

Configuring null host names

When you configure a zone name in GSLB, you enter the zone name, then associate host applications with the zone name. For example, you might configure the following for the “brocade.com” zone:

•www.brocade.com (HTTP application)

•ftp.brocade.com (FTP application)

Some e-commerce sites also accept just a zone name as an alias for a specific application within that zone. For example, a site might accept both “www.brocade.com” and “brocade.com” as valid names for the HTTP application on the web host. In this case, the second name has a null host name. No application is explicitly associated with the “brocade.com” zone, but the DNS server is configured to associate “brocade.com” with the same IP address(es) and application as “www.brocade.com”, for example using address records or alias records.

NOTE

The real Authoritative DNS server must be configured to support Null Host.

To configure a null host name, enter commands such as the following:

ServerIronADX(config)# gslb dns brocade-name brocade.com ServerIronADX(config-gslb-dns-brocade.com)# host-info www http ServerIronADX(config-gslb-dns-brocade.com)# host-info null-host http

The last command in the example above configures a null host for the brocade.com zone and associates the null host with HTTP.

Syntax: [no] host-info<host-name> null-host<host-application> <TCP/UDP-port-num>

You can configure one null host for each application and zone name.

Configuration example

Here is a proxy server configuration example for a GSLB ServerIron ADX.

To configure the ServerIron ADX as a DNS server proxy, enter commands such as the following:

ServerIronADX(config)# server real-name dns_ns 192.10.10.1 ServerIronADX(config-rs-dns_ns)# port dns proxy ServerIronADX(config-rs-dns_ns)# exit

ServerIronADX(config)# server virtual-name-or-ip dns-proxy 192.10.10.69 ServerIronADX(config-vs-dns-proxy)# port dns ServerIronADX(config-vs-dns-proxy)# bind dns dns_ns dns

The commands configure the GSLB ServerIron ADX as the proxy for the client’s DNS server.

The following commands configure the zone and host information for brocade.com and specify the IP address of the proxy server.

ServerIron ADX Global Server Load Balancing Guide	25
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