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Each enabled virtual printer needs its own IP address, and the documented
way to get several is to add secondary addresses to the adapter already in
use. Linux reads those back through `ip -j addr show`, which reports every
address. Windows and macOS have no `ip` command and fell through to a psutil
enumeration that stopped at the first IPv4 of each adapter, so a host with
three addresses on one NIC offered exactly one bind target and the second
virtual printer could only fail with "Bind IP ... is already in use".
The psutil path now collects every address, marking the ones after an
adapter's first as aliases the way the iproute2 path does. Callers that want
interfaces rather than addresses -- the discovery scan and the support bundle
-- project the primaries back out, so their view is unchanged.
The ioctl fallback that a Linux host without iproute2 used to get is now
reached only when psutil itself is missing, which gains that host aliases
too. The interface-name exclusions stay Linux-only: they are Linux device
names, and a Windows adapter called "Local Area Connection" matches the "lo"
prefix.