help with classless network and reverse lookups
Mark.Andrews at nominum.com
Mark.Andrews at nominum.com
Wed Mar 21 17:02:10 UTC 2001
>
> Thanks for the response... I'm a little unclear
> about having the two zones... probably becuase
> I didn't clearly state that I don't own the network
> addresses above my range of IP numbers, my ISP
> does... so they need to configure the CNAME
> portion, right?
Yes
> And the reverse zone file I have
> listed below is all I need for reverse name lookups
> right?
It's the minimum.
> As I only have 64 addresses... that's why I named
> the file 193.243.235 rather than 193.243.235.0-26
> because I won't have a 193.243.235.in-addr.arpa ...
> my ISP does.
You should be a slave for 235.243.193.in-addr.arpa
and a master for 0-26.235.243.193.in-addr.arpa though
I would call it 0-63.235.243.193.in-addr.arpa and have
the ISP delegate that zone and have the CNAMES point
into that zone.
0-63 is a range
0/26 is a cidr block
Classless in-addr does not always have to be a cidr block.
However as you have things working I would not mess with it
now other than changing the file name.
> So I just named it 193.243.235 as it's
> quicker to type in and I know I only have 64 addresses
> and it won't conflict with any other files unless I get
> a whole class C which I more than likely never will
> as there are only 3 of us in the company .... In any
> case, I contacted my ISP this morning, they did something,
> and now it works, so I guess my files were right as
> it's working now.
>
> I didn't understand the last part of this response...
> That I should "slave" off of this zone... I'm not
> really too up on slaving, I presume if I slave, I cache
> the data from that zone and then I will still get reverse
> name lookups to work localy if I become disconnected
> for any reason...
yes.
> any chance someone could
> show me what the entry in my named.conf would look like?
> and then I'll go away :-)
zone "235.243.193.in-addr.arpa" {
type slave;
masters { 193.243.233.10; };
file "193.243.235"; // note file name clash
}
Mark
>
> Thanks
>
> Bill
>
> Mark.Andrews at nominum.com wrote:
>
> > >
> > > Hi,
> > >
> > > I've been through the archive and I'm a little confused
> > > about classless subnetting and reverse name lookups.
> > > I believe I have my configuration setup correctly, but
> > > from what I have read in the archives, it seems to say
> > > that this should work for my internal network even if
> > > my ISP has not set their reverse zones up as per RFC2317...
> > > So, I am unclear if I have a problem in my configuration or
> > > if my ISP is not setup correctly and my server is referencing
> > > their servers and it isn't working because of that. The
> > > relevent bits are...
> > >
> > > named.conf contains
> > >
> > > zone "0-26.235.243.193.in-addr.arpa"{
> > > type master;
> > > file "193.243.235";
> > > };
> >
> > I would call the file "193.243.235.0-26", you will want
> > "193.243.235" for the 235.243.193.in-addr.arpa zone.
> >
> > >
> > > 193.243.235 contains
> > >
> > > $ORIGIN 0-26.235.243.193.in-addr.arpa.
> > > @ IN SOA ns0.terrapin.co.uk. postmaster.bill.co.uk. (....)
> > > ...
> > > @ NS ns0.terrapin.co.uk.
> > > @ NS ns0.emtex.com.
> > > 3 IN PTR lucida.terrapin.co.uk.
> >
> > looks reasonable, however you should post the whole master
> > file.
> >
> > >
> > > which I think is correct yet I can't get any reverse info,
> > > in fact when I start nslookup pointed at 193.243.235.3,
> > > it fails saying it can't find the name of the server.
> >
> > Use dig, nslookup is querky.
> >
> > > When
> > > I explicity point it at 193.243.235.3 again and do a host.domain
> > > lookup, it responds fine.... So, is the problem with my ISP
> > > or am I guilty of a typo somewhere (that I haven't been
> > > able to see for 10 hours????)
> > > The only other info I have at the moment is my My log files are telling
> > > me that
> > >
> > > named[4278]: Lame server on '3.235.243.193.in-addr.arpa' (in
> > > '235.243.193.in-addr.arpa'?): [193.243.233.9].53 'ns1.cerbernet.co.uk'
> > >
> > > ns1.cerbernet.co.uk is my ISPs name server....
> >
> > Well you are not going to succeed until the parent zone is setup.
> > You should also be a slave of this zone as you will need it when
> > you are disconnected from the net.
> >
> > Mark
> > >
> > > and then I get a
> > >
> > > named[4278]: ns_forw: query(10.235.243.193.in-addr.arpa) All possible A
> > > RR's lame
> > >
> > > and I haven't been able to figure out exactly what these
> > > are trying to tell me.
> > >
> > > I'd sure appreciate if someone could clear this up for me as
> > > I can't seem to make any further headway.
> > >
> > >
> > > Thanks,
> > >
> > > Bill
> > >
> > >
> > --
> > Mark Andrews, Nominum Inc.
> > 1 Seymour St., Dundas Valley, NSW 2117, Australia
> > PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at nominum.com
>
>
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at nominum.com
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