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by wasipwned 1296 days ago
Yes I posted the IP address here: https://news.ycombinator.com/item?id=33820749 and it appears to be AT&T's CGNAT IP address and communicating over port 4500 (IPsec), so the likely culprit is Wi-Fi calling which uses IPsec.

I'm running Ubuntu 20.04. I don't use livepatch, but I do update/reboot frequently. I'm mostly running Chrome, Firefox, and Docker. Occasionally GIMP and LibreOffice.