Quoting tom r lopes (tomrlopes@gmail.com):
> Ipv4 good but maybe a bit of latency :-).
If you're on an IPv4-only network and your Linux host operates a dual
IPv4/IPv6 stack, you can run into a situation where your host
continually attempts an IPv6 socket, waits for timeout, connection
fails, and only then attempts fallback to IPv4. This is super-annoying,
dumb behaviour, of course, but might (or might not) be what you
perceived as 'maybe a bit of latency'.
To test, do an experimental 'dig' across the Internet with the IPv4-only
flag. It's the '-4' flag, and there's a corresponding '-6' flag for
IPv6-only.
If that test reveals your stuck in the dumb-fallback scenario, there
are ways to force your stack (for that time period) to do IPv4-only.
I'm not going to spend time looking that up now, yet again, but it's
not difficult.
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