User ManualTable of ContentsContents3About This Document9Audience9Supported hardware and software9Document conventions9Text formatting9Notes, cautions, and danger notices10Notice to the reader10Related publications11Getting technical help or reporting errors11Web access11E-mail and telephone access11Global Server Load Balancing13Global Server Load Balancing overview13Basic concepts14GSLB example16GSLB policy18Minimum required configuration25Configuring GSLB27Proxy for DNS server29Adding a source IP address29Configuring real server and virtual server for the DNS server30Enabling the GSLB protocol31Configuring a site31Specifying site locations32Specifying GSLB controller locations33Configuring a zone33Private VIPs for GSLB38Configuring a public IP address for a VIP39Private VIP display information40Configuring GSLB protocol parameters41Secure GSLB68Initial session key generation69RSA challenge dialogue70GSLB message content randomization70Configuring secure GSLB70Regenerating the session keys75Minimum GSLB configuration76Site persistence in GSLB using stickiness76Algorithm77Enabling sticky GSLB78Allowing sticky sessions for a specific prefix length79Configuring the sticky GSLB session life time79Displaying current sticky GSLB sessions80Sticky GSLB counters81Deleting sticky GSLB session for a specific client82Deleting all sticky GSLB sessions82Site persistence in GSLB using hashing82Enabling hash-based GSLB persistence82Displaying the hash table82Hashing scheme83IP address allocation84IP address failure or removal from domain84Rehash: new IP address for a domain or change of state84Disabling rehash85Hash-persist hold-down: boot up considerations if rehash disabled86Manually forcing rehash for a domain86Show commands87Weighted distribution of sites with hash-based persistence88Overview of distribution of sites with hash-based persistence88Configuring distribution of sites with hash-based persistence91Configuring weights for domain IP addresses93Disabling rehash on introduction of new IP addresses or state change from down to healthy93Disable rehash when weight for an IP is changed93Displaying the contents of active RTT cache entries96Affinity97Defining the affinity98Displaying RTT prefix cache entries99Displaying affinity selection counters100GSLB domain-level affinity100Overview of GSLB domain-level affinity100Command line interface101DNS cache proxy103Enabling DNS cache proxy104Displaying DNS cache proxy state104Displaying DNS cache proxy statistics105Combining the DNS cache proxy and DNS override features106GSLB DNS type any query106Transparent DNS query intercept107Redirecting queries109Redirecting queries and perform GSLB111Responding to queries directly112Displaying transparent DNS query intercept statistics113Enabling DNS request logging114Distributed health checks for GSLB116DNSSEC124Verification with DIG126DNSSEC GSLB in DNS proxy mode126Configuring DNSSEC for GSLB127Displaying DNSSEC configuration128Displaying DNSSEC statistics128Host-level policies for site selection129Global vs host-level policy129Configuring host-level policies129Displaying host-level policy information137Deleting GSLB host-level policies140Configuration example140Geographic region for a prefix141How geographic location is determined141Configuring a geographic prefix142Displaying the number of geographic prefixes143Displaying information about geographic prefix143Example configuration144Smoothing mechanism for RTT measurements145Configuring enhanced RTT smoothing146Determining if the new RTT smoothing mechanism is enabled153Round-trip times153Passive RTT gathering153Active RTT gathering154Support for both active and passive RTT155Active RTT gathering issues and trade-offs156Enabling active RTT156Discarding passive RTT157Disabling passive RTT gathering157Configuring active RTT parameters158Probes for RTT gathering161Active RTT gathering and high availability support163Displaying RTT information164GSLB affinity for high availability169Configuring an HA group169Enabling dynamic detection170Displaying HA information171GSLB optimization174Optimized VIP list processing174Increased VIP support per site and reduced CPU usage on GSLB controller174Configuration example176Guidelines and recommendations for using this feature177Displaying GSLB information177Displaying site information177Displaying real server information180Displaying DNS zone and hosts182Displaying metric information186Displaying the default GSLB policy187Displaying the user-configured GSLB policy189Displaying RTT information190Displaying GSLB resources192Displaying dynamic server information193Specifying the source IP of probes196Displaying information in the prefix cache196SNMP traps and syslog messages198Syslog messages199Disabling and re-enabling traps200GSLB error handling for unsupported DNS requests200Default settings for GSLB error handling201Error handling response format202Disable or re-enabling GSLB error handling202Configuring the return code202Viewing error handling statistics203Clearing the error handling statistics203Global Server Load Balancing for IPv6205Global server load balancing for IPv6 overview205GSLB for IPv6 feature support206GSLB for IPv6 example207Basic GSLB for IPv6 configuration208Configuring the GSLB controller209Site ServerIron ADX configuration213Basic configuration example213Advanced GSLB configuration for IPv6215Configuring GSLB policy metrics for IPv6216Server (host) health metric220Weighted IP metric221Weighted site metric223Session capacity threshold metric225Active bindings metric226Geographic location metric228Available session capacity metric230FlashBack speed metric231Administrative preference metric232Least response selection metric233Round robin selection metric233Sticky persistence for IPv6234Hash-based persistence for IPv6237Weighted hash-based persistence for IPv6238Configuring DNS response parameters241GSLB of ANY queries242Displaying GSLB for IPv6 configurations243Show commands for basic GSLB configurations243Show commands for advanced features257Troubleshooting GSLB for IPv6 configurations258Reference Materials263RFC263IPv4263IPv6263DNS263IPv4263IPv6 address assignment266Size: 2.33 MBPages: 267Language: EnglishOpen manual
