Re: [gentoo-user] Disable IPv6 on specific interface

[Zesen Qian]

covici@××××××××××.com writes:

> Mick <michaelkintzios@×××××.com> wrote:
>
>> On Tuesday 30 Dec 2014 03:27:34 Zesen Qian wrote:
>> > Hello list,
>> > Sorry for hijacking Rich's thread, resend here.
>> > I want to disable IPv6 on an certain interface, a simple google
>> > tell me to add one line to /etc/sysctl.d/local.conf
>> > net.ipv6.conf.enp4s0.disable_ipv6=1
>> > Simple enough, but the problem I have is that both ipv6 and the
>> > dirver of the network card(tg3) is loaded by modules. They 're not
>> > loaded when the service sysctl is started, so there's no entry
>> > named "net.ipv6.conf.enp4s0", which make sysctl not working.
>> > So my question is that, is there any way to disable IPv6 on
>> > specific interface, as early as I can? I want to make it early
>> > because I don't want to receive any RA to mess up my route table.
>> > I guess just adding sysctl to preup() in /etc/conf.d/net should do
>> > the trick, but may I make it earlier?
>> > Any comment is appreciated.
>>
>>
>> Unless the kernel knows of the enp4s0 interface and therefore lists it under
>> sysctl, I can't see how it can be disabled.  You could try disabling IPv6
>> altogether in the kernel, but this may not be what you want to achieve.
>>
>> Alternatively, have a look with modinfo in the module options in the unlikely
>> chance that the module has some option which disables IPv6 functionality.
>
> You may be able to use the feature of modprobe that executes a command
> when the module loads and that way disable the ipv6 interface.  I have
> not tried this myself.

Hello Covici,
Yes, there's a rule named "install <modulename> [command..]" in
modprobe, but aren't they only applied to modprobe itself? I mean, in my
case the ipv6 and tg3 is loaded automatically(maybe by udev?), not by
running "modprobe ipv6". is this kind of module loading also affected by
modprobe rule(in /etc/modprobe.d/*.conf)?

-- 
Zesen Qian (钱泽森)