Thanks for the suggestion. That does work, although it's a bit messy to
have to advertise a prefix you don't want the clients to use.
On Sun, Oct 28, 2018 at 7:41 AM Simon Kelley
> Can you also add a dhcp-range for the ULA range, which deprecates it?
> On 27/10/2018 18:17, Christopher Martin wrote:
> > Greetings,
> > Is it possible to prevent Dnsmasq from advertising a specific prefix via
> > router advertisements?
> > Here's my situation. My ISP provides a dynamic IPv6 prefix which, using
> > wide-dhcpv6, ends up assigned to interface bond0. Dnsmasq then
> > advertises the prefix on bond0 out to the LAN. The various hosts on the
> > LAN use it, together with IPv6 privacy extensions, to generate global
> > IPv6 addresses. So far so good.
> > For reference, my config is as follows:
> > dhcp-range=::,constructor:bond0,ra-only,infinite
> > Here's the problem. I also assign a ULA to bond0 (fd00:etc.). Dnsmasq
> > also advertises this prefix to the LAN, but I don't want it to, because
> > then the other hosts on the LAN end up generating addresses based on it,
> > including via IPv6 privacy extensions. Whereas what I want is to
> > manually assign each host its own specific, unchanging and easily
> > remembered ULA, which should also be the source IP used when connecting
> > to various services around the LAN. Too many ULAs cause problems.
> > Is there a way to instruct Dnsmasq to _not_ advertise the ULA prefix,
> > but to continue advertising the global prefix from my ISP? Perhaps this
> > option already exists and I've simply missed it - apologies if that's
> > the case.
> > Thanks very much,
> > Christopher Martin
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