Classless in-addr.arpa delegation.
Kevin Darcy
kcd at daimlerchrysler.com
Mon Aug 28 22:31:03 UTC 2000
Wait a minute! What zone are those PTR's contained in? The C-class
zone? That's *bad*news*. Not only are you blinding your own clients to other
PTR's in that same C-class range, but you're propagating bogus Authority
Section data, thus potentially blinding *other*people's* nameservers to other
PTR's in that same C-class range, not to mention misdirecting traffic to your
nameservers.
There's a reason that RFC 2317 is a BCP.
- Kevin
Jay Nugent wrote:
> Greetings,
>
> On Mon, 28 Aug 2000, Kevin Darcy wrote:
>
> >
> > Doing RFC 2317 on a non-bit-boundary is a little unusual, but certainly
> > workable. That's why I say that "classless delegation" is somewhat of a
> > misnomer -- it's really *aliasing* rather than "delegation" _per_se_.
> > All your ISP needs to do is add 10 CNAMEs to the
> > 192.204.212.in-addr.arpa zone:
> >
> > 51 in cname 51.rev.jdimedia.nl.
> > 52 in cname 52.rev.jdimedia.nl.
> > 53 in cname 53.rev.jdimedia.nl.
> > (etc.)
> >
> > I've used "rev.jdimedi.nl" here as the "container" zone for the PTR
> > records, but you could use *anything* mutually-acceptable between your
> > and your ISP, as long as it's a zone delegated to, and controlled by
> > you.
>
> Or just have the ISP do the following which will send all PTR lookups
> to YOUR nameserver. Then on your nameserver you use conventional PTR
> records to do the final resolve.
>
> At the ISP:
> -----------
> 51 IN NS ns1.yourserver.com.
> 52 IN NS ns1.yourserver.com.
> 53 IN NS ns1.yourserver.com.
>
> In your nameserver:
> -------------------
> 51 IN PTR larry.yourdomain.com.
> 52 IN PTR moe.yourdomain.com.
> 53 IN PTR curley.yourdomain.com.
>
> I do this for my 128-host address block. My ISP didn't even know it
> could be done. They learn something new from their customers every day
> :-)
>
> --- Jay
>
> /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/~~\
> | Jay Nugent jjn at nuge.com |____|
> | Nugent Telecommunications www.nuge.com |
> | Web-Pegasus www.webpegasus.com |
> | (734)971-1076 (734)971-4529 /Fax |
> | |
> | ISP & Modem Performance Monitoring Svcs. |
> | Discount Reseller of 123.Net ISP Services|
> | Internet Consulting / Linux SysAdmin |
> | Web Hosting / DNS Hosting / Shell Accts. |
> | Embedded Controllers / Engr. & Design |
> /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/ |
> \_________________________________________\__/
>
> 6:00pm up 110 days, 7 min, 6 users, load average: 0.00, 0.00, 0.00
More information about the bind-users
mailing list