On Wed, 1 May 2013, Matt James wrote:
> Renaud (Ron) Olgiati wrote:
> > Newbee question: would it be it feasible, for the time of tests, to put a
> > network hub between the cable modem and the 1.4 box, so the 2.0 box can
> > share the cable modem ?
> ... maybe. It depends on the configuration of the cable modem. [snip]
I don't know anything about cable modems, as far as I know I've only
ever seen one and I never did anything with it. But the Ethernet ADSL
modems that I use have no trouble with this sort of setup as they can
simply be assigned an IP address on the 'inside' interface and then
they talk to whatever talks to them as you'd expect, just like any
other network device.
> ... if the Cable modem is doing it's own NAT and handing out addresses
> in the 10.X.X.X or 192.168.X.X ranges then you could have both hooked up at
> the same time. The only draw back there is that you are then running a
> double NAT which is generally not recommended. Might be OK for testing
> purposes, but you'll be in for a fight establishing VPN's or doing port
> forwarding, etc.
Since about the turn of the millennium I have been using one IPCop
machine (currently at version 1.4.21) in our sales office, with double
NAT behind an ADSL Ethernet modem. I have no problems with VPNs using
OpenVPN. Also I have no problems forwarding ports for things like ssh
access from outside the perimeter, a nameserver (port 53), mail servers
(ports 25, 465 and 587), stealth Web servers that listen on ports other
than 80, VPNs that don't use the standard OpenVPN port, and very likely
a bunch of other things that I can't remember right now.