Re: creating a netbsd router

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2017-07-19 20:01, Brook Milligan wrote:
> > On Jul 19, 2017, at 10:01 AM, Derrick Lobo <derrick.lobo%givex.com@localhost> wrote:
> >
> > So does that means each of the interface has an ip eg 192.168.0.1 on wm1
> > 192.168.0.2 on wm2 and so on and then just bridge all the interface. Ill try
> > that . for now only wm1 had an ip the rest did not have an ifconfig.wmx file
>
> I have a setup more or less like what I think you are interested in: 1 uplink port and 3 bridged ports.
>
> The uplink port is just marked up in its ifconfig file and gets its IP via dhcp from upstream.

Right. In addition, it might be worth pointing out that you need to 
enable routing in the system, or else the machines connected to the 
bridge will not be able to reach outside. You might also want to turn on 
a dhcp server for the bridge side, so that machines connected on that 
side gets an ip address, but all that are parts you are free to play 
with as you wish.

> Only one of the 3 bridged ports is assigned an IP; the rest are just marked up in their ifconfig files.  All four ports have individual ifconfig files.
>
> My ifconfig.bridge0 file looks like this:
>
> create
> !brconfig $int \
>         add wm1 \
>         add wm2 \
>         add wm3 \
>         up
>
> Whatever is plugged into any of the 3 bridged ports just communicate amongst themselves just like a “real” switch.

Right. I'm a bit surprised if you really need to set an ip address on 
any of those interfaces. Seems illogical and unnecessary. When you add 
them to the bridge, they will all be set in promiscuous mode anyway. No 
IP address needed. However, you do need your own IP address on this 
bridge, which I would think you normally setup through the bridge 
interface itself. And then, with routing enabled, machines on the inside 
can reach out. You might also want to run nat on this, unless you have a 
public range of ip addresses.

But it's all fairly straight forward, if you just think about it.

	Johnny

--
Johnny Billquist                  || "I'm on a bus
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