dhcpcd-discuss

Hi Paul

On Wednesday 06 May 2015 16:11:11 Walrath, Paul wrote:
> Is it possible to set static dhcp6_name_servers just like you can set static
> domain_name_servers?

No it's not.
static is designed to override specific DHCP values, mainly the ip address and 
routes it provides as dhcpcd handles that internally. A side effect is that it 
can also handle all other DHCP values as well.

However, there are several options
1) create /etc/dhcpcd.enter-hook and put new_dhcp6_name_servers="1::2"
2) add the directive env new_dhcp6_name_servers="1::2" in /etc/dhcpcd.conf

The downside of the above is that you'll see the variable in DHCP and RA hooks 
as well.

One alternative solution would be to set
nooption dhcp6_name_servers
in dhcpcd.conf and then set a static resolvconf(8) entry like so

echo "nameserver 1::2" | resolvconf -a static.dhcp6

It just so happens I have a portable resolvconf implementation you can find 
here if not on your OS: http://roy.marples.name/projects/openresolv/

> To allow domain name server addresses to come from a DHCPv4 server and from
> static assignment in dhcpcd.conf but not from a DHCPv6 server or ICMPv6
> router advertisement, the setup in dhcpcd.conf would be something like
> this:
> 
> interface eth0
> option domain_name_servers
> static dhcp6_name_servers=2001:4860:4860:8888
> 
> I don't think this works as I expect it to.  What do you think?

Well, we have the problem as described above.
Also, there is no mechanism right now to ignore ND6 options, so at least this 
will need to be added to dhcpcd.

Roy