Reverse lookups

[Tim Maestas]

	John, if you want delegation on a smaller than class C boundry,
	your ISP will have to perform classless reverse delegation,
	described in RFC2317.

	When, as in your example, you define the zone
	1.168.192.in-addr.arpa, but you don't own the whole class C,
	you blind yourself to the rest of the addresses.


-Tim

On Sat, 9 Dec 2000, John Cichy wrote:

> 
> Hello all,
> 
> This is my first post, please be gentle.
> 
> I need some advice about reverse-lookups. I have 5 static IP addresses
> supplied to me by my ISP.  I have bind 2.2p5 setup to resolve my ip's to
> the proper hosts on my network. The problem comes in when I try to
> reverse lookup, if in named.conf I put:
> 
> zone "1.168.192.in-addr.arpa" IN {
>     type master;
>     file "db.192.168.1";
> }   ; example addresses changed purposely
> 
> nslookup returns the proper hostnames for my IP's
> (192.168.1.10,192.168.1.11,192.168.1.12.192.168.1.13,192.168.1.14), but
> fails on any IP's that are outside of my range (ex 192.168.1.50), this
> makes sense because I have not defined this address.
> 
> If I try to use my network number (192.168.1.9) in the zone statement:
> 
> zone "9.1.168.192.in-addr.arpa" IN {
>     type master;
>     file "db.192.168.1";
> }   ; example addresses changed purposely
> 
> nslookup  asks my ISP's dns servers to resolve the address, again this
> makes sense because if I asked for 192.168.1.10 bind should not use this
> zone. My ISP says that they will update their reverse lookup tables if I
> send them a hostname for each IP. Sounds great, but here is my concern,
> I am running virtual hosts on the ip's. Will it cause problems when
> someone has received the IP 192.168.1.10 for virtualhost2.com, but when
> reverse lookup is done the get mainhost.com instead? I don't completely
> understand what the adverse affects of a different hostname being
> returned on the reverse-lookup.
> 
> BTW: my ISP's dns servers do return a hostname, although not mine, maybe
> I should not do anything with reverse-lookup then????
> 
> Thanks in advance and have a great day...
> John
> 
> 
>