16 ServerIron ADX Global Server Load Balancing Guide
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Configuring GSLB
1
You can configure the GSLB ServerIron ADX to be a proxy for more than one DNS server.
As shown in the example in Figure 1 on page 4, you implement GSLB by connecting a ServerIron
ADX to an authoritative DNS server. To configure the ServerIron ADX for GSLB, perform the following
steps:
• Add the proxy information for the DNS server. To configure the GSLB ServerIron ADX as a proxy
for the DNS server, add real server definition for the DNS server, then add a virtual server (VIP)
for the DNS server and bind the real and virtual servers.
The virtual server IP address (VIP) will be the Authoritative DNS server for the GSLB Domain.
• If a site contains ServerIron ADXs, identify the server sites. A server site is a data center or
server farm connected to the Internet by a router. This example shows two GSLB sites. Each of
the sites is connected to the Internet by a router.
• If a site contains ServerIron ADXs, identify the ServerIron ADXs within the server sites. This
initiates the GSLB protocol between the ServerIron ADX acting as a DNS proxy and the remote
ServerIron ADXs in the GSLB sites. The DNS proxy uses information supplied by the remote
ServerIron ADXs to assess the preferability of IP addresses in the DNS replies.
You can use the GSLB ServerIron ADX for standard SLB. In this case, identify the local site and
the GSLB ServerIron ADX in the same way as you identify the other sites and ServerIron ADXs.
The configuration steps are the same.
• Identify the DNS zones and the hosts within those zones for which you want the GSLB
ServerIron ADX to perform GSLB. You must specify the zones and hosts. There are no defaults.
• Identify the host applications with each host. The GSLB ServerIron ADX performs GSLB for the
applications you specify. You can specify applications known to the ServerIron ADX as well as
the TCP or UDP port numbers of applications that are not known to the ServerIron ADX. The
ServerIron ADX performs Layer 7 and Layer 4 health checks for the applications known to the
ServerIron ADX, but performs only Layer 4 health checks for applications that are not know to
it. Refer to
“Server health” on page 7.
Disable or re-enable GSLB Traps (optional)
Disable or re-enable GSLB SNMP traps and syslog messages page 186
GSLB Error Handling for Unsupported DNS Requests (optional)
Configure the ServerIron ADX to send error messages in response to client requests for
unsupported DNS record types.
page 188
TABLE 1 Configuration tasks: Global SLB (Continued)
Feature See page...
England 
Deutschland 
France 
Italia 
Polska 
United Kingdom 
Россия 
Nederland 
España 
Magyarország 
Sverige 
România 
Portugal 
Colombia 
Suomi 
New Zealand 
Česká republika 
Türkiye 
Danmark 
日本