Digi WAN 3G User Manual page 95

Request Idle Time-To-Live: Specifies the period of time, in seconds, that a DNS client

request will remain in the DNS Proxy cache, before it is deleted. This is a period of idle
time, during which neither a DNS client request retry is received by the DNS Proxy, nor
a DNS server response is received by the DNS Proxy, for a specific DNS client request.
A shorter Idle TTL results in resources being used more efficiently by the DNS Proxy,
since the client request cache is reduced in size and the request buffers are released more
quickly for future use for other DNS client requests.
Request Retries Per DNS Server: Specifies the number of retries using the same DNS

server, for a specific DNS client request that is being retried (retransmitted) by the DNS
client. There is always one "try" but the number of retries is configurable.
For new client requests received when the request cache is full:
Specifies how to handle new client requests when the maximum number of client
request entries is already being serviced (the request cache is full). There are two
choices for this option:
Replace the Least Recently Used (LRU) client request with the new request:
Remove the least recently used entry from the cache, and add an entry for the new client
request.
Discard (ignore) new requests until some existing requests have expired:
Silently discard the new client request, and do this for all future new requests until one
or more entries have expired and been removed from the request cache.
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