[Dnsmasq-discuss] local.net / ipv6 confusion
kbass at kenbass.com
Tue Oct 22 19:39:51 BST 2013
My dnsmasq.conf file contains (running on my asus (merlin) router -
using dnsmasq 2.65):
Everything was working fine. I use server1.local.net as a FQDN
throughout my local network.
And then yesterday I enabled ipv6 on my router and this all stopped
working (or maybe only on windows machines). So I am wondering if I
could get some help on how to fix this.
My suspicion is that the resolver on Windows machines is perhaps
ignoring my local DNS server and instead querying an actual ipv6 server
from the ISP so it never finds my host.local.net names.
I did verify via some test websites that the router is working with
The router is currently running radvd, dhcp6c, and dhcp6s.
So i think the solution to this is for dnsmasq to at least handle dns
queries locally and forward them.
1) Do I need radvd or is 'enable-ra' equivalent? I noticed in my
/etc/radvd.conf file that 'AdvLinkMTU 1480'. I dont see how dnsmasq does
an equivalent thing and whether this is even important.
2) I've changed the RDNS in the /etc/radvd.conf and replaced it with the
ipv6 of my router.
3) On windows 7, is there something I need to do to force a refresh of
these ipv6 dns servers? They don't seem to change even with ipconfig
/release and /renew. However after rebooting my router and waiting 10-15
minutes, it seemed to update.
4) I am thinking that for dnsmasq to handle the ipv6 queries, it needs
to bind on the ipv6 address and that can only occur if I add a
dhcp-range (which means killing dhcp6s)?
I added the following
dhcp-range=lan6,XXXX:XXXX:XXXX:XXXX::, ra-stateless, ra-names
#ISP ipv6 DNS
Am I on the right track? Currently it seems to work (still using radvd),
though I'm not sure if it is my imagination, but latency to websites
seem longer. Are added DNS lookups causing this?
This appears to be working which raises other questions (perhaps more
- When I look some of my existing Linux machine with ifconfig, I notice
that they have an ipv6 global address which contains the correct prefix.
Where did this come from? I am unaware that those machine are running
any dhcpv6 client. I did nothing to them, yet they can ping6 the router
and ipv6.google.com. Does the ip stack handle processing router
advertisements itself? How does it know?
- How do I assign meaningful ipv6 DNS names to these when they are using
this stateless configuration? Or do I need to use stateful?
- Now that I've got this wonderful /64 address space, if I want to
access these machines from the internet do I need to do anything special?
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