On 7 June 2010 10:48, Mark Hindess <mark.hind...@googlemail.com> wrote: > > I recently started seeing quite a lot of socket test failures on my > main Debian Linux machine. It turns out that an upgrade of the netbase > package included a new file: > > /etc/sysctl.d/bindv6only.conf > > which sets the system configuration: > > net.ipv6.bindv6only = 1 > > which means that IPv6 bound sockets only accept IPv6 connections and not > IPv4 connections (w/address mapping). The expectation is that daemons > wanting to accept both IPv6 and IPv4 connections bind twice. > > Then I had a Eureka! moment and remembered that I had some FreeBSD > changes that I had not committed yet because I was still getting socket > test failures when I had fixed everything that I thought was broken.... > and the pattern of failures was similar. Changing the equivalent > "net.inet6.ip6.v6only=0" seems to have fixed most of the remaining > issues. I'll tidy up these changes[0] and commit them shortly. > > For the time being I've changed this back on my machine (by editing the > above file and replacing the 1 with 0). However, I wonder if we should > be handling this in the classlib implementation. If we don't then users > will experience a change in behaviour unless they change the system > default but changing the system default may have unintended consequences > for other applications. > > I believe it is possible to set the IPV6_V6ONLY socket option to avoid > the change in behaviour but for the moment, it looks like the RI is not > doing this so I guess we shouldn't either? >
FYI, this problem has also been found with OpenJDK and patched (at least, in the Debian package so far). http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2010-April/008866.html > Regards, > Mark. > > [0] Mostly removing the many things that I tried that we not actually > necessary ;-) > > > -- Andrew :-) Free Java Software Engineer Red Hat, Inc. (http://www.redhat.com) Support Free Java! Contribute to GNU Classpath and the OpenJDK http://www.gnu.org/software/classpath http://openjdk.java.net PGP Key: 94EFD9D8 (http://subkeys.pgp.net) Fingerprint: F8EF F1EA 401E 2E60 15FA 7927 142C 2591 94EF D9D8
