On 01/22/2018 02:27 AM, Andy Hawkins wrote:
Hi,
In article <8534ac3c-30d0-095a-8bde-179bdbe8f...@thekelleys.org.uk>,
            Simon Kelley<si...@thekelleys.org.uk> wrote:
Do you have an interface configured with an address in fd01::/64 ?

Is this a requirement? radvd is able to send advertisements out on an
interface that has no IPv6 address configured (indeed, I have been using
this facility to automatically configure the interface that router
advertisements are being sent on).

Would be nice to be able to do the same with dnsmasq without having to
manually configure the IPv6 address of the interface.

Andy,

I've run into this limitation as well, due to using the "no on-link prefixes" option in neighbor discovery (meaning that I use dhcpv6 for address assignment, and radvd doesn't advertise any onlink prefix).

This means I don't have a /64 prefix configured on any interface which matches the range from which dnsmasq assigns IPv6 addresses.

My workaround is to remove the /64 check from dnsmasq (see below). I've been meaning to discuss this on the list.

   Erik


diff -r -u ../dnsmasq-orig/dnsmasq-2.75/src/option.c src/option.c
--- ../dnsmasq-orig/dnsmasq-2.75/src/option.c 2015-07-30 12:59:07.000000000 -0
700
+++ src/option.c        2017-06-13 15:14:58.109166818 -0700
@@ -2734,9 +2734,6 @@
                  ret_err(_("prefix length must be exactly 64 for subnet constru
ctors"));
              }

-           if (new->prefix < 64)
-             ret_err(_("prefix length must be at least 64"));
-       
            if (!is_same_net6(&new->start6, &new->end6, new->prefix))
              ret_err(_("inconsistent DHCPv6 range"));


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