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

[covici@ccs.covici.com]

Mick <michaelkintzios@gmail.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.


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         John Covici
         covici@ccs.covici.com