Re: Virtual Network Interfaces

Raymond,

On Sun, Oct 22, 2006 at 06:01:03PM +0200, Jeremie Le Hen wrote:
On Mon, Oct 16, 2006 at 02:12:47AM -0400, Raymond Wagner wrote:
My ISP provides me up to 5 dynamically assigned addresses out of a /20
block. I have more than 5 machines on my network, so I have no choice but
to run NAT, however I would like to force two of those machines onto their
own external addresses. If I had static addresses, I could simply alias the
addresses into the external interface and then use "binat" in pf to redirect
the traffic. However, the addresses have to be requested from the DHCP
server, and expire after 4 hours.

I can get this to work by running the NAT function under QEMU and just
giving the virtual machine several interfaces bridged to the physical
external interface. Running a VM is far from ideal. Is there any way I
could set up a virtual network interface that could be bridged to the true
interface and grab its own DHCP address?

I don't know if that works, but I would try the following setup.
Supposing you have two physical interaces, an external one (ext0)
and an internal one (int0), I would create a VLAN on int0 for
each machine which have to have its own public address (vlan1
and vlan2) and bridge { ext0, vlan1, vlan2 }.

I thought of another way this morning in my bathroom, which is far
neater, though I've not tested it.

First use if_bridge(4) to mingle ext0 and int0, then use the MAC
addresses to let through but the machines that are supposed to have
a public IP address; the other will have to use your FreeBSD as a
default gateway.

Regards,
--
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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