In article <E1DFZcB-0006Fm-00@alva.home>,
	Tim Shepard <shep@alum.mit.edu> writes:
> I've recently (past couple months) seen some difficulty getting to
> some IPv6 addresses (but not all) from some of my machines which are
> using IPv6 addresses derived from the 6to4 mechanism (RFC 3056 & RFC 3068).

The connectivity to machines using 6to4 should have improved a lot in the
last few month because the ISC is now running its own 6to4 relay router.
Here's an example "traceroute6" output from "ftp.netbsd.org".

traceroute6 to defence-grid.zhadum.org.uk (2002:51bb:254e::1) from 2001:4f8:4:7:2e0:81ff:fe21:6563, 64 hops max, 12 byte packets
 1  2001:4f8:4:7:290:6900:730:541f  0.476 ms  0.406 ms  0.36 ms
 2  r2-sfo2.r1.sql1.isc.org  2.542 ms  2.784 ms  2.384 ms
 3  lucy.hopcount.ca  2.871 ms  2.84 ms  3.007 ms
 4  2002:51bb:254e::1  175.647 ms  160.095 ms  162.955 ms

That's not too bad.

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/