2.6.12 DNS Support

The DSR supports DNS lookups for resolving peer host names to an IP address. The operator can configure up to two DNS server addresses designated as primary and secondary servers. The wait time for DNS queries for connections initiated by the DSR is configurable between 100 to 5000 milliseconds with a default of 500 milliseconds. This process is used for both dynamic peer discovery and A/AAAA lookups.

The DSR supports both A (Ipv4) and AAAA (Ipv6) DNS queries. If the configured local IP address of the connection is Ipv4 the DSR will perform an “A” lookup and if it is Ipv6 the DSR will perform an “AAAA” lookup. If the IP address of the connection is undefined by the operator, the DSR will resolve the host name using both A and AAAA DNS queries when initiating the connection. The DSR can either use the peer’s FQDN or an FQDN specified for the connection as a hostname for the DNS lookup.