This subject has probably been talked to death, so I apologise in advance
for bringing it up!
Is there any DNS server currently availible that can reply to DNS lookups
based on the source IP address?
Yes, this would be for directing users to a 'local' server hosting
www.example.org (or something similar).
Yes, this is not the best way of doing it I know 
I was wondering if there was something available that DID this yet.
Thanks.
Something more dynamic than Bind9 views?
Adi
Hello Avleen,
Wednesday, April 24, 2002, 2:55:15 PM, you wrote:
This subject has probably been talked to death, so I apologise in advance
for bringing it up!
Is there any DNS server currently availible that can reply to DNS lookups
based on the source IP address?
Yes, this would be for directing users to a 'local' server hosting
www.example.org (or something similar).
Yes, this is not the best way of doing it I know
I was wondering if there was something available that DID this yet.
Split horizon DNS is the term you are looking for.
It's trivial to do with TinyDNS. I know BIND supports it but I've
never set it up with BIND. I'd say any mature DNS server supports it.
Thanks,
David mailto:davidu@everydns.net
Is there any DNS server currently availible that can reply to DNS lookups
based on the source IP address?
Yes, all those global load balancing products. (e.g. Cisco Distributed
Director). Alternatively, some people (myself included) have written
their own DNS server for use within their organisation which does the
same thing. I'm not aware of a freeware solution to this.
Yes, this would be for directing users to a 'local' server hosting
www.example.org (or something similar).
Yes, this is not the best way of doing it I know
It's the best way to do global server load balancing, as I see it.
Simon
tinydns can; the obvious challenge is devising a useful set of mapping
metrics.
-a
Yes. djbdns has done this for quite a while. Note I am not necessarily
recommending the use of djbdns, I am just saying it will do this.
I also know that bind9 has added functionality similar to what you are
looking for. I'm a bind fan myself.
- Forrest W. Christian (forrestc@imach.com) AC7DE
If you have a network, you can just use the same IP for your dns
servers in multiple locations, and let your IGP route it to the closest
one.
I believe this is in the context of:
'hax0r _bob (for instance) has a PTR for his ip which says
"I.love.humble.net" when machines a->y query for the PTR, BUT when machine
z queries it returns "www.cert.org"'
I could be off base here, but I think this is the question Avleen is
asking, eh?
--Chris
(chris@uu.net)
Hey Chris 
I believe this is in the context of:
'hax0r _bob (for instance) has a PTR for his ip which says
"I.love.humble.net" when machines a->y query for the PTR, BUT when machine
z queries it returns "www.cert.org"'
Hmmm, yes and no
I could be off base here, but I think this is the question Avleen is
asking, eh?
I was asking about almost the opposite.
Actual scenario is this:
  Load balancing WWW and IRC servers.
I believe this use of load-balanced DNS would be a fairly typical use.
I want all users from IP space allocated to ARIN to go to my US web and
IRC servers. I want all other users to go to my EU based servers.
I want to maintain two primary servers in each continent as hubs across
which all traffic flows, and data is sync'd.
As someone clearly pointed out to me, people have taken IP space from
these regions and ported it to other places in the world. While this may
be true, I believe it's use is small enough that I don't have to worry
about it too much.
On the other hand what you point out would be a very important effect for
this. Potentially a good way to obfuscate your hostnames to either a small
select group, or to the whole world.
http://www.powerdns.com/pdns and especially
http://doc.powerdns.com/a1405.html#PIPEBACKEND
and
http://doc.powerdns.com/backend-writers-guide.html
But beware, it is not free, not as in beer and not as in speech! Free for
not-for-profit use though.
The pipebackend will let you do this in perl or in python or whatever. You
could also code more complete backends in C++ using the third URL.
Regards,
bert
Bind version 9 has the "view" config statement that may do what you want
:: On Wed, Apr 24, 2002 at 08:55:15PM +0100, Avleen Vig wrote:
:: >
:: > This subject has probably been talked to death, so I apologise in advance
:: > for bringing it up!
:: >
:: > Is there any DNS server currently availible that can reply to DNS lookups
:: > based on the source IP address?
::
djbdns (tinydns) can do this via location tags.
http://cr.yp.to/djbdns/faq/tinydns.html
(see question: "How do I send different clients to different clusters of
servers?")
-jba