I had a IPv6 Global address set: inet6 addr: 2001:18e8:3:443:208:74ff:fe2c:xxxx/64 Scope:Global I set CONFIG_IPV6_PRIVACY=y and rebooted into the new kernel. My IP address didn't change and the MAC is still discoverable vis ipv6calc. $ ipv6calc -i -m 2001:18e8:3:443:208:74ff:fe2c:xxxx ... EUI48=00:08:74:2c:xx:xx Reproducible: Always Linux 2.6.25-gentoo-r7 #1 SMP Mon Jul 28 10:29:53 EDT 2008 i686 Intel(R) Pentium(R) 4 CPU 1.80GHz GenuineIntel GNU/Linux Portage 2.1.4.4 (default/linux/x86/2008.0, gcc-4.1.2, glibc-2.6.1-r0, 2.6.25-gentoo-r7 i686) ================================================================= System uname: 2.6.25-gentoo-r7 i686 Intel(R) Pentium(R) 4 CPU 1.80GHz Timestamp of tree: Thu, 31 Jul 2008 06:45:01 +0000 app-shells/bash: 3.2_p33 dev-java/java-config: 1.3.7, 2.1.4 dev-lang/python: 2.4.4-r13 dev-python/pycrypto: 2.0.1-r6 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.2.18.1-r2 sys-devel/autoconf: 2.13, 2.61-r2 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1 sys-devel/binutils: 2.18-r1 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 1.5.26 virtual/os-headers: 2.6.23-r3 ACCEPT_KEYWORDS="x86" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=i686 -pipe" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/udev/rules.d" CXXFLAGS="-O2 -march=i686 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans userfetch userpriv usersandbox" GENTOO_MIRRORS="https://gentoo.ussg.indiana.edu/ http://gentoo.ussg.indiana.edu/" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage/" USE="3dfx 3dnow X alsa bindist bitmap-fonts bzip2 crypt dbus dlloader firefox ipv6 java jpeg kerberos mailwrapper ncurses nptl nptlonly opengl pam pic png readline sound sse ssl tcpd threads tiff trutype-fonts type1-fonts unicode userlocales x86 xorg xscreensaver xv zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" USERLAND="GNU" VIDEO_CARDS="i810" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Can you tell me the value of /proc/sys/net/ipv6/conf/all/use_tempaddr
(In reply to comment #1) > Can you tell me the value of /proc/sys/net/ipv6/conf/all/use_tempaddr # sysctl -A |grep use_tempaddr net.ipv6.conf.all.use_tempaddr = 0 net.ipv6.conf.default.use_tempaddr = 0 net.ipv6.conf.lo.use_tempaddr = -1 net.ipv6.conf.eth0.use_tempaddr = 0 net.ipv6.conf.dummy0.use_tempaddr = 0 net.ipv6.conf.sit0.use_tempaddr = -1
Is the documentation on use_tempaddr relevant? Documentation/networking/ip-sysctl.txt
(In reply to comment #3) > Is the documentation on use_tempaddr relevant? > Documentation/networking/ip-sysctl.txt Yes. use_tempaddr - INTEGER Preference for Privacy Extensions (RFC3041). <= 0 : disable Privacy Extensions == 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses. > 1 : enable Privacy Extensions and prefer temporary addresses over public addresses. Default: 0 (for most devices) -1 (for point-to-point devices and loopback devices) Set: # sysctl -A |grep use_tempaddr net.ipv6.conf.all.use_tempaddr = 2 net.ipv6.conf.default.use_tempaddr = 2 net.ipv6.conf.lo.use_tempaddr = -1 net.ipv6.conf.eth0.use_tempaddr = 2 net.ipv6.conf.dummy0.use_tempaddr = 0 net.ipv6.conf.sit0.use_tempaddr = -1 Setting net.ipv6.conf.all.use_tempaddr wasn't enough. Computer now how two IPv6 addresses set. The one I mentioned above, and a new temporary address.
Would you be able to test with 2.6.26 and on failure, try a development kernel 2.6.27
(In reply to comment #5) > Would you be able to test with 2.6.26 and on failure, try a development kernel > 2.6.27 I could, but temp addresses started working with the options below set via sysctl. net.ipv6.conf.all.use_tempaddr = 2 net.ipv6.conf.default.use_tempaddr = 2 net.ipv6.conf.eth0.use_tempaddr = 2 Enabling the option in the kernel + these settings enabled temporary, randon IP addresses. The IPv6 address created based on the MAC address is still present, but it is no longer prefered for outgoing connections.
workaround identified
