What do you get when you add San Jose+Warsaw+Austin?

The short answer, no more connections to dead hosts! The longer answer looks more like:

In this blog, we show how a TCP socket can timeout during various stages of its lifetime, and how TCP keepalives and user timeout influence that. To better illustrate the internals of TCP connections, we’ll mix the outputs of the tcpdump and the ss -o commands. This nicely shows the transmitted packets and the changing parameters of the TCP connections. Read the details on the Cloudflare blog.