Pavel Simerda <psime...@redhat.com> writes:
>> > there isn't any possibility to disable IPv6 link-local addresses. In
>> > fact it's not properly supported even in the kernel.
>>
>> echo 1 > /proc/sys/net/ipv6/conf/$DEVICE/disable_ipv6 works for me?
>
> 1) First of all it doesn't *specifically* disable kenrel link-local
> addresses allocation but performs some magic to disable a couple of
> IPv6 features at once. This wouldn't be a problem in the original
> poster's case as he wants to disable IPv6 anyway.
That's sort of implied, isn't it? You cannot remove all IPv6 LL
addresses from an interface without disabling IPv6. This is a protocol
requirement. Ref e.g. RFC 4291:
2.8. A Node's Required Addresses
A host is required to recognize the following addresses as
identifying itself:
o Its required Link-Local address for each interface..
[etc]
> 2) But setting disable_ipv6 doesn't really work as expected. See [1]
> and especially the note about disable_ipv6 below the table.
I read that note, but couldn't figure out what expectations that would
be. FWIW, disable_ipv6 works for me as well. That is: The behaviour
matches my expectations. Which are
/proc/sys/net/ipv6/conf/$DEVICE/disable_ipv6 = 1
=> no IPv6 LL address on $DEVICE
/proc/sys/net/ipv6/conf/$DEVICE/disable_ipv6 = 0
=> IPv6 supported, including an EUI-64 based LL address
changing IFF_UP does not affect the above in any way
Are you sure this wasn't one of the bugs fixed by commit 73a8bd74e261
("ipv6: Revert 'administrative down' address handling changes.")? It's
difficult to tell from the link you gave, because it just refers to an
unspecified "kernel". Which could be a FreeBSD kernel for all I know
:-)
Bjørn
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