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www.asansecurity.com
DynDNS
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DynDNS - Dynamic DNS - is a feature where a network device has a static DNS name and a dynamic IP -address.
The service provider that provides the DynDNS service maintains a resolve list for the DynDNS names vs. the IP-
address it refers to. The device is given a DNS name instead of an IP-address in the configuration.
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DynDNS service providers can be searched for on the Internet e.g., with “DynDNS service provider”
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For example most of the consumer network connections have a dynamic IP -address, so a DynDNS service is
required if one wishes to access the camera from the public network (Internet).
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By default, the ASANTech NVR resolves the (camera) DynDNS -names only when the recording service is started.
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The browser interface resolves the DNS names when it is started.
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If there are cameras configured into an NVR with dynamic DNS names, do the following:
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Find and edit the following file on ASANTech NVR:
/asan/releases/java/jre/lib/security/java.security
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Locate the following line in the file:
#networkaddress.cache.ttl=-1
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The value indicates the caching policy for successful name lookups of the (DNS) name service. The value
is specified as an integer to indicate the number of seconds to cache a successful lookup. A value of -1
indicates “indefinite". Remove the comment mark in the beginning of the line, and replace the value -1
with, for example, 60 (seconds). After saving the file the recording service need to be restarted.
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On a Windows computer using the browser user interface, the file path is
C:\Program Files\Java\jre6\lib\security\java.security
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Otherwise the procedure is the same as above.