DNS beginner question

[Michael S]

The "open" ports are simply port-forwarded from the router to my
internal network (NAT). And I only have one public IP.
For me the more important issue is whether DNS would work with private
IP addresses.


On 7/5/06, David Stanford <dthomas53 at gmail.com> wrote:
>
>
> On 7/5/06, Michael S <msherman77 at gmail.com > wrote:
> > Hi all.
> >
> > I am trying to set up a DNS service. I have 2 FreeBSD machines, one's
> > web and DNS (that I am setting up) and the other FTP. Both machines
> > are behind a router and get local addresses (i.e. 192.168....). If
> > DNS, FTP and web ports in the router are open, will I be able to set
> > up the DNS in a way such that when someone from the outside types
> > www.mydomain.com, he'll be taken to the machine that runs apache, and
> > when he types ftp.mydomain.com he'll be taken to the machine which
> > runs ftp?
> > By the way simply typing ftp://mydomain.com and http://mydomain.com
> > does the trick, but I want it to work with prefixes too.
> >
> > Hopefully my question isn't too confusing.
> >
> > Thanks in advance.
> > Michael
> >
>
> Hi Michael,
>
> You'll have to clarify "open" regarding the WEB, DNS, and FTP ports on the
> router. Are they simply port-forwarded to the internal servers (meaning
> based on service ports) or do you have one-to-one NAT mapping a public IP to
> an internal for each server? If it's the latter, and each machine has its
> own public IP, then you can simply set DNS to point to each server
> respectively:
>
> www.mydomain.com -> publicIP1 -> privateIP1
>  ftp.mydomain.com -> publicIP2 -> privateIP2
>
> The real question is whether you have a block of public IPs or just one. But
> to be honest, you can probably get away with just having a single public IP
> and using port forwarding as most browsers (including Firfox and IE)
> recognize the "ftp" and "www" subdomains and automatically adjust to that
> protocol.
>
> i.e. ftp.somedomain.com will automatically be translated to
> ftp://ftp.somedomain.com (ftp.freebsd.org ).
>
> -David
> --
> [root at fbsd ~]# fortune
> Happiness is just an illusion, filled with sadness and confusion.