dhcpcd-discuss

On 04/12/2017 09:57, Roger James wrote:
> Thank you for the quick response. I was hoping the noipv6 option would 
> do the kernel parameters stuff for me. It would seem reasonable that 
> telling dhcpcd that I do not want ipv6 on an interface should be 
> interpreted that all the necessary actions to fully disable it should be 
> taken, including setting kernel parameters.

Then we would need another knob to say "don't do IPv6 and disable kernel 
parameters" as the current knob just turns off IPv6 in dhcpcd.

> I had not read the man page closely enough.
>
> " noipv6  Don't attmept to configure an IPv6 address." sic.
>
> I was interpreting noipv6 as "disable ipv6 on this interface 
> completely". I still think it is confusing that if you tell dhcpcd that 
> you do not want ipv6 addresses, that you still end up with ones 
> configured by the kernel.
>
> Because this interface is a monitor I still want the link level to be 
> active, I have had problems in the past with pcap not working when ipv6 
> was disabled at the kernel level. I think I will try it first with just 
> accept_ra turned off.

Have you considered that dhcpcd might not be the best tool for this?
If you only want a link level monitor, try the netplug package:
http://www.serpentine.com/blog/software/netplug/

Of course, if you're using dhcpcd on other interfaces, keep using dhcpcd :)

Roy