[Dnsmasq-discuss] IPv6 on OpenWRT

[Aaron Wood]

On Mon, Jan 16, 2017 at 7:37 PM, Eric Luehrsen <ericluehrsen at hotmail.com>
wrote:

> Hi Alec,
>
> Have you tried setting `--dhcp-option=option6:dns-server,[fd00::]` for
> auto fill in of ULA or `--dhcp-option=option6:dns-server,[::]` auto ~ GA?
>
> By default dnsmasq will send [fe80::] LL in RA and DHCPv6, but some
> clients do not like DNS on LL. It also can break down in some
> virtual-bridge situations. The client network driver forgets (or software
> resolver bug doesnt enter) which interface to route [fe80::] on. IT often
> requires %eth0 or some such. The above options will override this [fe80::]
> address, and make the situation more robust..
>

I've realized that OSX has the same issue as a client, and so I've been
trying to get this to work on LEDE/OpenWRT.  And all I'm getting from
dnsmasq is grief about the opt-spec being incorrect:

The following:
dhcp-option=option6,dns-server,[fd00::]
yields errors about invalid options

And the following:
dhcp-option=option6,6,[fd00::]
complains about an invalid ip address

It's v2.76.

But I see from the compile options, that IPv6 may only be partially
configured:
IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP *no-DHCPv6* no-Lua TFTP
no-conntrack no-ipset no-auth no-DNSSEC no-ID loop-detect inotify

And so I'm guessing that with the ipv6 option, RA works, but without
DHCPv6, none of the features like option6 work correctly??

-Aaron
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