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135926
2023 Aug 05
2
Question on simultaneous IPv4 and IPv6 "any address" listening
Cheers all,
TL;DR version:
I've recently found that at least on my test box the `LISTEN *` line had
only set up an IPv4 `0.0.0.0` listener but not an IPv6 `::0` listener for
`upsd`. In fact, at least on a "dual-stack" system, it seems impossible to
bind to both - so depending on binding order I either lose IPv6 or lose
IPv4 directly (but have it practically as IPv4-over-IPv6).