I can't answer any questions about FBSD Jails.
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What is the network alias?
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A NIC may respond to multiple IP addresses. There is a primary IP address, and optionally any number of secondary addresses that it will respond to. These are "alias addresses."
A single service may "listen" and respond to packets destined for multiple IP addresses. Or, multiple services may "listen" for packets using the same protocol/port but different IP addresses.