John, Doesn't the prefix need to be assigned to br0, and not to eth0, so that the constructor and delegations work correctly?
-Aaron On Tue, Mar 7, 2017 at 3:33 PM, John Knight <john.kni...@belkin.com> wrote: > Thanks John for the info on the RA interval. > > > > My main problem however is that dnsmasq is not advertising the RA. I > think I don’t understand how the constructor works. In my case, the WAN > interface receives the RA from the upstream router. I then want to use > this same prefix of the WAN interface and have dnsmasq send to LAN > interface. How do I do this? > > > > If I specify constructor:eth0, it does indeed find the prefix used to > create IPv6 Global address on WAN interface… but dnsmasq then assumes I > want to do RA advertisements on eth0! Which I do not… I want dnsmasq to > use the same prefix on the LAN interface (br0). So this seems to be wrong: > > enable-ra > > dhcp-range=net:br0,::1,::400,constructor:eth0,ra-names,64,12h > > ra-param=br0,60 > > > > > > And results in the following logged messages: > > ar 2 12:10:40 dnsmasq-dhcp[6026]: DHCPv6, IP range ::1 -- ::400, lease > time 12h, template for eth0 > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: DHCPv4-derived IPv6 names on > eth0 > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: router advertisement on > eth0 > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: DHCPv6, IP range 2001:db8:100:5555::1 > -- 2001:db8:100:5555::400, lease time 12h, con > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: DHCPv4-derived IPv6 names on > 2001:db8:100:5555::, constructed for eth0 > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: router advertisement on > 2001:db8:100:5555::, constructed for eth0 > > Mar 2 12:10:40 dnsmasq-dhcp[6026]: IPv6 router advertisement enabled > > > > If I specify constructor:br0, then it does not find the prefix as there is > prefix on the LAN interface. It seems that dnsmasq assumes that there is > already a prefix applied to the LAN interface. The question I have then, > is how does the LAN interface get configured? The RA is only seen on the > WAN interface… how is SLACC applied to the br0 interface? I am trying to > understand how this is supposed to work. I presume that once the LAN > interface is configured and I use the constructor:br0 in my configuration, > then I am guessing I will start seeing the RA being advertised. Am I right? > > > > Comments anyone? > > > > John > > *From:* John Newlin [mailto:jnew...@google.com] > *Sent:* Tuesday, March 07, 2017 12:37 PM > *To:* John Knight > *Cc:* dnsmasq-discuss@lists.thekelleys.org.uk > *Subject:* Re: [Dnsmasq-discuss] Cannot get IPv6 RA to occur > > > > I think you need an: > > ra-param=${internal_iterface},60 > > > > The 60 is send an RA every 60 seconds. > > > > > > > > On Tue, Mar 7, 2017 at 11:57 AM, John Knight <john.kni...@belkin.com> > wrote: > > Hi, > > > > I am trying to get dnsmasq to send out IPv6 RAs to my LAN interface (br0), > but can’t seem to get it to work. I have tried various configurations I > have found on the internet, but to no avail. > > > > I am using dnsmasq 2.76. My router has WAN interface (eth0) that has an > IPv6 global address that was configured via PD from RAs received from > upstream router. I am trying to use dnsmasq to service the LAN clients on > br0, and to do this I want to enable dnsmasq router advertisements (RA). > > > > Here is my current attempt at configuration: > > dhcp-range=::a,constructor:br0,ra-names,1d > > enable-ra > > > > I have also tried this: > > dhcp-range=tag:br0,::1,::FFFF:FFFF:FFFF:FFFF,constructor:br0,ra-names,1h > > enable-ra > > > > And many other variants of the above. > > > > The dnsmasq.log file shows the following: > > DHCPv4-derived IPv6 names on br0 > > Router advertisement on br0 > > IPv6 router advertisement enabled > > > > However, my LAN client attached to br0 does not receive an RA. It never > establishes a global IPv6 address. I have also verified this using > “tcpdump –I br0 | grep advert”. I see no advertisements on the br0 > interface. > > > > This does raise a few questions for me: > > 1) How does dnsmasq learn of the prefix to use for the RA? I want > it to use the prefix received on the WAN interface (eth0) for the RA on the > LAN interface (br0). It is not clear to me how to configure this. > > You have to request this from the upstream dhcpv6 server, it's called > prefix delegation. > > > > > > 2) The dnsmasq log file indicates “Router advertisement on br0”. > Does this mean that it sent out the Router advertisement on br0? I thought > so, but alas, I do not see the RA on br0. > > 3) With radvd, there are controls to determine the frequency of > advertisements. Are there any controls for dnsmasq? What is the default > frequency of RA advertisement? > > 4) I only have the man page for dnsmasq. Is there a User guide with > more details on using dnsmasq? > > 5) I am currently using radvd in the router, and I am thinking if I > can get this to work, I will stop using radvd. Are there any compelling > reasons to use dnsmasq RA over radvd? > > 6) What is the preferred/expected syntax for the dhcp-range? I have > seen a number of different variations and find it very confusing... even > the two examples abover have different syntax. Both seem to be accepted by > dnsmasq. > > > > I appreciate your help with this. I hope to get this to work soon. > > > > Thanks, > > > > John Knight > > john.kni...@belkin.com > > > > __________________________________________________________________ > Confidential This e-mail and any files transmitted with it are the property > of Belkin International, Inc. and/or its affiliates, are confidential, and > are intended solely for the use of the individual or entity to whom this > e-mail is addressed. If you are not one of the named recipients or > otherwise have reason to believe that you have received this e-mail in > error, please notify the sender and delete this message immediately from > your computer. Any other use, retention, dissemination, forwarding, > printing or copying of this e-mail is strictly prohibited. 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