ServerIron ADX Global Server Load Balancing Guide 199
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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:
The host-info ip-list command 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.
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