Re: Public IP to Private IP

[Robby Workman <robby@rlworkman.net>]

On Mon, 27 Jan 2014 13:22:17 -0600
Scott Mayo <scotgmayo@gmail.com> wrote:

> I am having some troubles getting my public IPs routed to my private
> IPs.
> 
> Here is an example.
> Private IP of the main server with my IPTables:  192.168.0.1
> Public IP of the main server:  1.1.1.1
> I also have 1.1.1.2 and 1.1.1.3 as public IPs attached to the public
> nic. Domain name example.org is pointed to 1.1.1.2
> 
> I am trying to get the following public IPs to Private IPs:
> 1.1.1.2 -> 192.168.0.2
> 1.1.1.3 -> 192.168.0.3
> 
> If I am outside my network and go to example.org, it seems to work
> fine. If I am inside my network and go to 192.168.0.2 then it works
> fine. If I go to example.org from inside my network then it goes back
> to 192.168.0.1 instead of 192.168.0.2
> 
> Maybe this does not have to do with IPTables even since it works with
> an IP, but I thought I would ask here.  I do not have an internal DNS
> server.
> 
> Here are the rules that I have:
> 
> IPTABLES -t nat -A PREROUTING -d 1.1.1.2 -p tcp -j DNAT
> --to-destination 192.168.0.2
> IPTABLES -t nat -A POSTROUTING -d 192.168.0.2 -j SNAT
> --to-destination 1.1.1.2
> 
> Any suggestions would be appreciated.


The best solution (IMHO) is to handle it internally with DNS, i.e.
have the names you expect to see on those public ip addresses resolve
to the internal addresses from inside the local network.

-RW