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Flush entries after X minutes:
This option allows old cached entries to be flushed from the cache after a specified time. By default a time to live of 1440 minutes (1 day) is used. After an entry has been in the cache for a day, it will be flushed from the cache and have to be re-learned via a lookup.
Enable pre-emptive lookup of IP addresses:
Instead of looking up each address sequentially, this option will extract the IP addresses from the message before it is added to the processing queue. The addresses will be asynchronously resolved and the results cached. When the message is processed seconds later, the results will already be available in the cache. The DNS resolution is done via a multi-threaded lookup system that can handle up to 100 simultaneous lookups. If you are receiving lots of messages and want to resolve IP addresses as they arrive, it is highly recommended that this option be enabled.
Pre-load the cache with static entries from a hosts file:
Enabling this option will cause the program to load a list of static host entries at start-up. The list must contain IP addresses and host names separated by a tab character. The addresses are loaded into the cache and marked as static, this means they will never expire and won't be flushed like the dynamically learned entries.
An example hosts file is included in the install folder. It is named "StaticHosts.txt"
Example of a host file:
# Static DNS host file
# Each entry must consist of an IP address, a tab, then a host name
# The IP address is in the format aaa.bbb.ccc.ddd
# The host name can be any text value that you like up to 63 characters in length
# Comments can be on a separate line and must start with a # character
# 192.168.1.1 myhost.mycompany.com
# NOTE: The IP address and host name MUST be separated with a tab (ASCII chr 9)
# Spaces will not be recognised as a valid separator
# Default value for localhost
# local machines