Re: Disabling link local IPv6 addresses

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On Tue, Jan 10, 2012 at 2:29 PM, Gilboa Davara <gilboad@xxxxxxxxx> wrote:
> On Tue, Jan 10, 2012 at 12:00 PM,  <nullv@xxxxxxx> wrote:
>> Hi,
>>
>> I've been using radvd to set up a group of clients using RA broadcasts. I also have a group of client PCs using static IPv6 in a different ::/64 subnet altogether but on the same physical network. The two networks have to remain separate for security reasons.
>>
>> The problem I'm having is that clients on the two separate networks can still "see" each other through the automatic link-local (fe80::) addresses. I've added the line IPv6_AUTOCONF=no to network & my ifcfg-* files but I can't seem to stop this behaviour.
>>
>> Any hints, tricks, hacks, gotchas?
>>
>> Thanks
>
> Two steps:
> 1. Create a file named /etc/sysctl.d/disable-ipv6.conf in
> /etc/sysctl.d/ that will contain:
> net.ipv6.conf.all.disable_ipv6=1
> This will disable IPv6 in all future reboots.
> In the mean time (current boot), type:
> sysctl -w net.ipv6.conf.all.disable_ipv6=1
> 2. Gotchas: sshd will continue to bind to IPv6 socket, breaking X11
> forwarding [1].
> The solution to the problem is to add the following line to /etc/sysconfig/sshd:
> OPTIONS=-4
>
> - Gilboa
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=735889

Re-reading your post - this is not what you want, as it will disable
IPv6 completely.
Sorry for the noise.

- GIlboa
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