[Dnsmasq-discuss] dnsmasq: routing non /24 reverse in-addr.arpa requests

[Albert ARIBAUD]

Hi again Alessandro,

Le Sun, 28 Aug 2016 14:56:35 +0200
Alessandro Bottonelli <alessandro at bottonelli.it> a écrit:

> Il 2016-08-28 11:53 Albert ARIBAUD ha scritto:
> > Hi Alessandro,
> > 
> > Le Sun, 28 Aug 2016 11:33:02 +0200
> > Alessandro Bottonelli <alessandro at bottonelli.it> a écrit:
> > 
> > Here's the current /etc/dnsmasq.conf content (I added the line
> > numbers):
> > 
> > -----
> > 1.  # routing PTR queries to nameservers:
> > 2.  server=/50.150.10.in-addr.arpa/10.150.50.17
> > 3.  server=/51.150.10.in-addr.arpa/10.150.50.17
> > 4.  server=/52.150.10.in-addr.arpa/10.150.50.17
> > 5.  server=/53.150.10.in-addr.arpa/10.150.50.17
> > 6.  server=/54.150.10.in-addr.arpa/10.150.50.17
> > 7.  server=/156.240.10.in-addr.arpa/10.150.50.17
> > 8.  server=/157.240.10.in-addr.arpa/10.150.50.17
> > 9.  server=/158.240.10.in-addr.arpa/10.150.50.17
> > 10. server=/129.240.10.in-addr.arpa/10.240.129.113
> > 11. # anything else not defined above (strict-order is set)
> > 11. server=/10.in-addr.arpa/10.159.59.41
> > ----
> > 
> > The issue is with line 7, actually 10.240.156.x IS NOT a /24 net. I
> > tried different syntax forms, I searched, but could not find a way
> > to tell dnsmasq about that.
> > 
> > [10.240.156.x looks like a /24 (sub)net to me, what with three
> > bytes out
> > of four being constant. Do you mean the third byte may be something
> > else than 156? Or is x being restricted to less than whole 0..255
> > range?]
> >   
> The latter you wrote. My line 7 is wrong I know, but I don't know how
> to write it differently.
> I can rev 10.240.156.6 by asking 10.150.50.17. But 10.240.156.101 is 
> reversed only by 10.159.59.41 (tried with dig -x 10.240.156.101 
> @10.159.59.41 and works fine).
> 
> And that's my issue, what's the syntax (if available) to tell dnsmasq
> to ask for reverse for less than 0.255 range? Say ask
> 10.240.156.[0-63] revs to 10.150.50.17 and ask 10.240.156.[64-255]
> revs to 10.159.59.41.
> 
> And/Or, as previously asked, is there a way to tell dnsmasq to ignore 
> NXDOMAIN coming from one server (say 10.150.50.17) and keep asking
> the others (till the and of the server list)?

Er... Maybe you missed the second part of my answer. Here it is again:

> > Can you use rev-server? The manpage gives an example with a subnet
> > size for rev-server (whereas it does not give any size for server).
> > Maybe other values than 24 work too -- I haven't checked the source
> > code, only the manpage.

Did you try this?

> Thanks,

Amicalement,
-- 
Albert.