Package: network-manager Version: 0.8.1-6+squeeze1 Severity: normal Tags: ipv6
On my IPv6 network with prefix length 112, network manager sets the IPv6 address on the interface with prefix length 64: nordmark@ano7:~$ ip -6 addr 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 inet6 2001:6b0:1:1e90::40:34/64 scope global valid_lft forever preferred_lft forever inet6 fe80::92e6:baff:fe52:723c/64 scope link valid_lft forever preferred_lft forever nordmark@ano7:~$ ip -6 route 2001:6b0:1:1e90::40:0/112 dev eth0 proto kernel metric 256 expires 86242sec mtu 1500 advmss 1440 hoplimit 0 2001:6b0:1:1e90::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::/64 dev wlan0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 default via fe80::92e6:baff:fe68:ce8f dev eth0 proto kernel metric 1024 mtu 1500 advmss 1440 hoplimit 64 Note the correct route with prefixlength 112 inserted by the kernel (from listening to RA), and the wrong route with prefix length 64 caused by NetworkManager when it set the address. All addresses that share the 64 bit prefix but not the 112 bit prefix has become unreachable. In fact DHCPv6 when giving out addresses does not deal with prefix lengths at all, and thus the DHCPv6 client has no idea what the prefix lenth should be. The ISC DHCPv6 client does in fact return a prefix length to Network Manager, but it is hard coded to always be 64, and when Network Manager trusts this information, this bug appears. In Network Manager, one could always set the address with prefix length 128, since the correct route with be inserted by the kernel anyway. I tried modifying the ISC DHCPv6 client to always return 128 as the prefix length, and then things work as expected. Alternatively, since Network Manager in fact listens to RAs, it already has the correct prefix length, and could use that. Using the DHCPv6 client for the prefix length information is the wrong thing to do, anyway. Thanks Arne -- System Information: Debian Release: 6.0.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: i386 (i686) Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores) Locale: LANG=sv_SE.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages network-manager depends on: ii adduser 3.112+nmu2 add and remove users and groups ii dbus 1.2.24-4+squeeze1 simple interprocess messaging syst ii isc-dhcp-client 4.1.1-P1-15+squeeze3 ISC DHCP client ii libc6 2.11.3-3 Embedded GNU C Library: Shared lib ii libdbus-1-3 1.2.24-4+squeeze1 simple interprocess messaging syst ii libdbus-glib-1-2 0.88-2.1 simple interprocess messaging syst ii libgcrypt11 1.4.5-2 LGPL Crypto library - runtime libr ii libglib2.0-0 2.24.2-1 The GLib library of C routines ii libgnutls26 2.8.6-1+squeeze1 the GNU TLS library - runtime libr ii libgudev-1.0-0 164-3 GObject-based wrapper library for ii libnl1 1.1-6 library for dealing with netlink s ii libnm-glib2 0.8.1-6+squeeze1 network management framework (GLib ii libnm-util1 0.8.1-6+squeeze1 network management framework (shar ii libpolkit-gobject-1 0.96-4+squeeze1 PolicyKit Authorization API ii libuuid1 2.17.2-9 Universally Unique ID library ii lsb-base 3.2-23.2squeeze1 Linux Standard Base 3.2 init scrip ii udev 164-3 /dev/ and hotplug management daemo ii wpasupplicant 0.6.10-2.1 client support for WPA and WPA2 (I Versions of packages network-manager recommends: ii dnsmas 2.55-2+b1 A small caching DNS proxy and DHCP ii iptabl 1.4.8-3 administration tools for packet fi ii modemm 0.4+git.20100624t180933.6e79d15-2 D-Bus service for managing modems ii policy 0.96-4+squeeze1 framework for managing administrat ii ppp 2.4.5-4 Point-to-Point Protocol (PPP) - da Versions of packages network-manager suggests: ii avahi-autoipd 0.6.27-2+squeeze1 Avahi IPv4LL network address confi -- Configuration Files: /etc/NetworkManager/NetworkManager.conf changed: [main] plugins=ifupdown,keyfile no-auto-default=90:e6:ba:52:72:3c, [ifupdown] managed=false -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org