The answer for IPv4 was figured out here:
http://unix.stackexchange.com/questions/90443/sysctl-proc-sys-net-ipv46-conf-whats-the-difference-between-all-defau
The behaviour is non-obvious. For some settings the interface and 'all'
settings are ANDed together; for others they are OR'd, for others the
MAX is taken.
send_redirects is an OR, which means you can enable sending of redirects
on all interfaces (conf.all.send_redirects=1) but you cannot disable
sending them on all interfaces. In that case you have to set
conf.all.send_redirects=0 *and* set each individual interface.
So in /etc/sysctl.conf you have to list all the interfaces which the
host has (or may have) at startup time, if you want to disable sending
of redirects on those interfaces. A tri-state setting for conf.all would
be much more useful, but that's not what we have.
Now back to the original report, which was about
net.ipv6.conf.all.autoconf=0. What is the intended behaviour from the
kernel authors?
include/linux/inetdevice.h appears to have IPv4 settings only. For IPv6:
grep -R devconf_all net/ipv6
Unfortunately it's not obvious to me how "all" + interface-specific
parameters interact for IPv6. There are some places where the two are
explicitly combined: e.g.
[net/ipv6/ndisc.c]
(net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp)
&&
I don't see anything similar for autoconf. However there is:
[net/ipv6/af_inet6.c]
MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all
interfaces");
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/96578
Title:
The sysctl net.ipv6.conf.all.autoconf does not apply to "all"
Status in “linux” package in Ubuntu:
Confirmed
Status in “linux-source-2.6.20” package in Ubuntu:
Invalid
Bug description:
Binary package hint: linux-source-2.6.20
Just specifying:
net.ipv6.conf.default.autoconf=0
net.ipv6.conf.all.autoconf=0
in sysctl.conf does not actually disable autoconf.
Explicitly setting
net.ipv6.conf.eth0.autoconf=0
on the other hand does work (if I've added "ipv6" to /etc/modules, but
that's another issue).
Our workaround for this is to list enough ethN to cover "all likely" network
interfaces, but that's not exactly a neat solution.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
Cannot stat file /proc/4797/fd/11: No such file or directory
USER PID ACCESS COMMAND
/dev/snd/controlC0: maswan 2400 F.... pulseaudio
/dev/snd/pcmC0D0p: maswan 2400 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf3020000 irq 21'
Mixer name : 'Analog Devices AD1884'
Components : 'HDA:11d41884,103c2819,00100100'
Controls : 30
Simple ctrls : 18
DistroRelease: Ubuntu 10.04
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
ppp0 no wireless extensions.
MachineType: Hewlett-Packard HP Compaq dc7800 Convertible Minitower
NonfreeKernelModules: openafs
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-33-generic
root=/dev/mapper/rootvg-rootlv ro quiet splash
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, user)
LANG=en_US
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-33.71-generic 2.6.32.41+drm33.18
Regression: No
RelatedPackageVersions: linux-firmware 1.34.7
Reproducible: Yes
RfKill:
Tags: lucid kconfig needs-upstream-testing
Uname: Linux 2.6.32-33-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev
video voice
dmi.bios.date: 02/26/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786F1 v01.28
dmi.board.asset.tag: CZC84703HB
dmi.board.name: 0AACh
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC84703HB
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr786F1v01.28:bd02/26/2009:svnHewlett-Packard:pnHPCompaqdc7800ConvertibleMinitower:pvr:rvnHewlett-Packard:rn0AACh:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP Compaq dc7800 Convertible Minitower
dmi.sys.vendor: Hewlett-Packard
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