Re: Virtual Network Interfaces
- From: Andrew Thompson <thompsa@xxxxxxxxxxx>
- Date: Fri, 3 Nov 2006 06:28:51 +1300
On Thu, Nov 02, 2006 at 06:12:22PM +0100, 'Jeremie Le Hen' wrote:
Hi Raymond,
On Tue, Oct 31, 2006 at 11:10:47AM -0500, Raymond Wagner wrote:
Your other method is that I keep NAT on the internal interface as normal,
and then create VLANs, bridged to the external interface, to each computer
with an external IP. Those machines would communicate as normal on the
internal network, but use the VLAN interface for external access. I've not
used VLANs before, so I don't know exactly how they work. I know the
wrapper causes some overhead, and my switch drops packets >1500 bytes. Do I
have to lower the MTU on the internal network, or just the VLANs and
external? Also, will my ISP know not to send the larger packets?
802.1q (namely VLAN) adds a 4-bytes header which means your network
adapter must support a MTU of 1504 bytes. AFAIK, most of network
cards do this. I haven't heard of problems like this so far.
I've Cc'ed Andrew Thompson which has imported if_bridge(4) from
OpenBSD into FreeBSD. He will likely be able to answer your question
and tell whether it is possible to bridge two VLAN interfaces
(attached to a physical interface) with another physical interface.
That will work fine. The area where the bridge lacks is bridging vlan
trunks but you do not appear to be doing that.
Andrew
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