June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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The target resource must be monitored
The resource being guarded must be continually monitored and care taken that false positives are minimized.
Connectivity and uptime should be polled via some meaningful method. Simply pinging a host isn't reliable since too many routers deny ICMP by default. DNS providers that provide failover enable various mechanisms to fine-tune this, such as minimum thresholds, variable polling intervals, and send/expect dialogs.
Open source packages, such as nagios or sensu, can be employed and then integrated with various methodologies to dynamically update a subject zone (after all, failover DNS is really a type of an enhanced dynamic DNS use case).
Multiple monitoring points should be used and results cross-referenced. ...
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