On 4/03/2007 8:43 AM, Paul Colquhoun wrote:
On Sun, 4 Mar 2007, Bob Young wrote:
This isn't strictly a Gentoo question, but I'm setting up Gentoo box
to be used as a secondary DNS server, plus some other duties, and I'm
hoping there is a DNS wizard reading who can authoritatively answer my
question.
First off the machine has three network cards, one with a (DHCP)
private IP (10.10.32.1) for talking to the local (Windows Domain) LAN.
A second NIC with a (Manually configured) IP address (69.12.134.79)
that is publicly registered (ns.debug1.com) as a secondary DNS for
several domains. And the third NIC has a (Manually configured) private
IP address (192.168.0.1) that will be used to "sniff" all traffic that
crosses the DSL modem.
Obviously on a given system each NIC is usually connected to a
different domain, my question is, whether or not it
is /legal/possible/okay to use different *hostnames* on different
NICs?
For example, in the scenario described above, assume the windows
domain is named "mydomain.lan," can I have 69.12.134.79 (NIC #2)
resolve to ns.debug1.com as that is it's publicly registered name,
while IP address 10.10.32.1 (NIC #1) resolves to gentoo.mydomain.lan?
Given that 2 of your IP addresses are in RFC 1918 private IP space, it
is a good thing not to have your public DNS name resolve to those IP
addresses, as they should not be routable, and may be in use at amny
other sites (and thus could resolve to a local address at those sites).
That's exactly what named "views" are for. You can have clients on one IP range
resolve to entirely different IP addresses than those on the outside:
http://www.isc.org/sw/bind/arm94/Bv9ARM.ch06.html#view_statement_grammar
I have been using bind views in that way for the last 2 years or so so that my
internal DNS looks different to that seen on the Internet, the feature works
exactly as documented and it's fairly easy to set up.
That way there is no need to ever have hosts resolve to private RFC 1918 IP
addresses from the Internet.
Reuben
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