2 Basic GSLB for IPv6 configuration
The GSLB controller makes decisions based on the GSLB policy. In the example above, both the IPv6 VIPs were healthy, so client was directed to the IPv6 VIP that was geographically closer based on the configured policy. If the VIP at the geographically closer site (the US site) was down, the GSLB controller would direct traffic to the EU site.
1.US IPv6 client (browser) sends a DNS request for the website brocade.com.
2.The client’s local DNS server sends a recursive query for www.brocade.com to the GSLB controller (a ServerIron ADX with ADNS VIP).
3.The GSLB controller determines that the request is for an IPv6 address (query type AAAA) and so checks the IPv6 address list and identifies GSLB Site 1 (US) as the optimal IP for clients in the US based on the configured GSLB policy. (Similarly, a request for an IPv4 address would have been directed to GSLB Site 3 or Site 4.)
4.The GSLB controller sends a GSLB DNS response with the VIP address (2001:DB8::56) to the local DNS server. Note that the controller only sends the best IP to the querying client because "dns
5.The local DNS server sends the GSLB DNS response to the querying client.
6.The US IPv6 client initiates communication with the selected VIP. Application traffic flows directly between the IPv6 client and the IPv6 VIP at GSLB Site 1.
Basic GSLB for IPv6 configuration
Basic configuration tasks include the configuration of the GSLB ServerIron ADX and the site ServerIron ADXs to support GSLB of IPv6 addresses. Tasks include the configuration of a VIP for the ADNS, the enabling and configuration of DNS cache proxy mode with override lists, and the definition of zones and sites on the GSLB ServerIron ADX. Also, the GSLB protocol must be enabled on the site ServerIron ADXs.
The features shown in Table 16 describe the configuration parameters required for a basic GSLB for IPv6 configuration.
TABLE 16 | Basic GSLB for IPv6 configuration tasks |
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Feature |
| See page... |
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On GSLB ServerIron ADX controller |
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Adding a VIP for the ADNS server | page 197 | |
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Enabling DNS cache proxy | page 197 | |
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Enabling DNS override | page 198 | |
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Specifying the zones and the host names within the zones | page 198 | |
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Specifying DNS override IP lists | page 199 | |
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Specifying the sites and the ServerIron ADXs within the sites | page 200 | |
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On Site ServerIron ADXs |
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Enabling the GSLB protocol | page 201 | |
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196 | ServerIron ADX Global Server Load Balancing Guide |
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