Gslb For Ipv6 Example - Brocade Communications Systems ServerIron ADX 12.4.00 Manual Manual

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GSLB for IPv6 example

Typically, GSLB for IPv6 is used to distribute IPv6 traffic to multiple sites for load balancing,
geographic proximity, or redundancy.
Figure 12
GSLB controller acts as the authoritative DNS server for the www.brocade.com domain. The
domain IPs for www.brocade.com are a mix of IPv4 and IPv6 addresses. When the GSLB controller
receives DNS queries from resolvers (local DNS), it generates a response based on a configured
GSLB policy.
In this example, the GSLB controller sees that the client is geographically closer to the US site and,
therefore, directs application traffic to the closer VIP.
FIGURE 12
sends DNS request
for AAAA record for
ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
If the client does not advertise EDNS0 header with a buffer larger than 512 bytes, eight IPv6
addresses per host are supported in the response.
If the client advertises EDNS0 header with a buffer smaller than 512 bytes, forty IPv6
addresses per host are supported in the response.
shows a deployment of IPv6 GSLB in DNS cache proxy with DNS override mode. The
IPv6 GSLB configuration
Local DNS
DNS
US IPv6 client GSLB DNS response
www.brocade.com. = 2001:db8::56.
www.brocade.com.
US IPv6 Client (Browser)
Global server load balancing for IPv6 overview
Client local DNS server
sends AAAA query for
www.brocade.com.
The GSLB DNS response
www.brocade.com. = 2001:db8::56
Application traffic
GSLB Site 3 (US) GSLB Site 4 (EU)
Site ADX
VIP: 192.108.22.111 VIP: 209.157.22.210
GSLB SI ADX
ServerIron ADX with ADNS VIP
ZONE CONFIG (ip-list):
www.brocade.com. = 192.108.22.111
www.brocade.com. = 209.157.22.210
www.brocade.com. = 2001:db8::56
www.brocade.com. = 2001:db8::ab
GSLB POLICY:
health geographic
dns best-only
GSLB Site 1 (US) GSLB Site 2 (EU)
Site ADX
VIP: 2001:DB8::56 VIP: 2001:DB8::ab
2
Site ADX
Site ADX
195