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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https://bugs.launchpad.net/bugs/96578
Title:
The sysctl net.ipv6.conf.all.autoconf does not apply to "all"
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