Brocade Communications Systems 12.4.00 manual Specifying DNS override IP lists

Basic GSLB for IPv6 configuration 2

•FTP: the well-known name for port 21. (Ports 20 and 21 both are FTP ports but on the ServerIron ADX, the name “FTP” corresponds to port 21.)

•TFTP: the well-known name for port 69

•HTTP: the well-known name for port 80

•IMAP4: the well-known name for port 143

•LDAP: the well-known name for port 389

•NNTP: the well-known name for port 119

•POP3: the well-known name for port 110

•SMTP: the well-known name for port 25

•TELNET: the well-known name for port 23

The <TCP/UDP-port-num>parameter specifies a TCP/UDP port number instead of a well-known port. If the application is not one of those listed above, you still can configure the GSLB ServerIron ADX to perform the Layer 4 health check on the specified port. If the application number does not correspond to one of the well-known ports recognized by the ServerIron ADX, the GSLB ServerIron ADX performs Layer 4 TCP or UDP health checks for the ports but does not perform application-specific health checks.

NOTE

For other applications (applications not listed above), the ServerIron ADX does not perform a Layer 7 heath check but still performs a Layer 3 or Layer 4 TCP or UDP health check. You can customize the HTTP health check on an individual host basis by changing the URL string the ServerIron ADX requests in the health check and the list of HTTP status codes the ServerIron ADX accepts as valid responses to the health check.

Specifying DNS override IP lists

Once you enable DNS override, you must configure a set of IP addresses (an IP list) for each domain name (zone and host) configured on the GSLB ServerIron ADX (GSLB controller).

You can specify as many IP addresses as you need for a given domain. When you specify multiple IP addresses, the GSLB ServerIron ADX uses the applicable GSLB policy metrics to select the best address from the list of addresses you configure. For information about the metrics, refer to “Configuring GSLB policy metrics for IPv6” on page 204.

Although DNS override is a global parameter. DNS override IP lists are associated with a specific host in a specific domain. To configure the proxy server information on the GSLB ServerIron ADX, enter commands such as the following:

ServerIronADX(config)# gslb dns zone brocade.com ServerIronADX(config-gslb-dns-brocade.com)# host-info www http ServerIronADX(config-gslb-dns-brocade.com)# host-info www ip-list 2001:db8::56

The host-infoip-listcommand configures a list of IP addresses corresponding to host names for which the GSLB controller acts as the authoritative DNS server (ADNS). In the example, a single proxy server IPv6 address is specified for the zone called “brocade.com”.

Syntax: [no] host-info <host-name>ip-list <ipv6-address>

The <host-name>parameter specifies the host name.

ServerIron ADX Global Server Load Balancing Guide	199
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