if_bridge interface confuses Windows Small Business Server 2000

Steve Bertrand iaccounts at ibctech.ca
Tue Nov 15 13:43:18 GMT 2005

> FreeBSD 6 came at the perfect time for me.  I've just 
> switched my primary desktop from Win2k to FreeBSD, and I put 
> the Windows boot disk in an old machine that was heading for the skip.
> I wanted to access the W2k machine (fred) over VNC without 
> flooding our switch, so I thought let's take advantage of the 
> new features in REL 6...  I added a second ethernet card to 
> my FreeBSD box (alfie) and configured a bridge in /etc/rc.conf:
> 	ifconfig_rl0="DHCP"
> 	ifconfig_rl1="up"
> 	cloned_interfaces="bridge0"
> 	ifconfig_bridge0="addm rl0 addm rl1 up"
> 	gateway_enable="YES"
> SBS is configured to give a static DHCP lease of 
> to alfie; fred is dynamic and is currently
> At first everything seemed fine, and fred operates as if it 
> was plugged straight into the network.  
> But...
> 1) SBS sees both machines as alfie, even though it correctly 
> reports the MAC addresses of each machine
> 2) On alfie, when I want to make a VNC connection to fred I 
> have to type "vnc viewer alfie"(!)
> 3) On fred, if I ping alfie it returns as the IP 
> number, not 181 which is the static lease.
> I assume this is a bug in if_bridge, only because I assumed 
> that bridge 
> interfaces should be transparent (and act like a physical switch).
> When we get some small switches in I'll use one to connect 
> the two machines 
> together, but I'd still like to work out what's going on 
> here.  Am I doing 
> something wrong?

I'm a wee bit confused here, but I do understand what you are trying to

First, did you compile a new kernel with the following option?:

options BRIDGE

Second, try giving both PC's a static IP address, and disconnect the
FBSD box entirely from the network (so you essentially have a 2 pc
network), then commence testing.



> Ashley
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