DNS Host Health Check Configuration Settings
DNS Host Health Check comes with preconfigured settings, and is disabled by default on the DNS server.
Attribute |
Description |
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Host Health Check (host-health-check) |
Enables or disables DNS Host Health Check in the DNS server. When Host Health Check is enabled, DNS server sends hhc-max-ttl as TTL in query reply for active RRs. When DNSSEC is enabled, DNS server will add RRs which are not active at the end of RR list in the query reply. When DNSSEC is not enabled, DNS server will not add RRs which are not active in RR list in the query reply. host-health-check is disabled on the DNS server by default. Reload the DNS server after enabling host-health-check. |
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Failed Domain Response (hhc-failed-domain-response) (available in Expert mode only) |
Specifies how the DNS server responds to the requests when all RRs are down. The possible settings are: send-servfail—Configures the server to respond with SERVFAIL if all the RRs are down in nameset. send-all-rrs—Configures the server to respond with all RRs even all the RRs are down in nameset. drop-req—Configures the server to drop the query when all the RRs are down in nameset. |
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Host Health Check Interval (hhc-interval) |
Specifies the time interval (in seconds) to check RR Sets for reachability. |
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Max TTL (hhc-max-ttl) |
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Max Initial TTL (hhc-max-init-ttl) |
Specifies the maximum initial TTL (in seconds) to send in query reply when Host Health Check RR is queried for the first time.
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GTP Echo Port (hhc-gtp-echo-port) (available in Expert mode only) |
The port to which GTP-C echo messages are sent and received. |