Hi,

(First post here, so please be gentle...)

First, I have whole bunch of identical boxes that run the same level 
OS and are rock solid - supermicro 1U, P4 servers running NetBSD 1.6.2.

I am trying to create a GRE tunnel between two of the boxes, slightly 
different hardware. Although I have been unsuccessful at actually 
passing data through the tunnel, I seem to have been able to create 
the tunnel. At least, according to "ifconfig" the interface is up, and 
"netstat" shows routes.

The problem is, that while I was trying to figure out why packets were 
escaping into the ether never to return, I managed to wedge the 
machines a few times. I can't reproduce the sequence every time, but 
basically when I issued the
"ifconfig gre0 create inet 10.0.0.1 10.0.0.3 netmask 255.255.255.192 
up" command the machine just locked. It gave NO sign of life; it 
didn't even respond to keyboard input. In fact, the signal to the 
monitor was even cut off - monitor went into power saving mode. At 
first I thought it could be a hardware issue, but it happened on both 
machines I was trying it on. In fact, once the command completed OK on 
machine "A" and when I switched to an tried it on machine "B" machine 
"A" wedged.

I am at the end of my, obviously limited. wits here; and I am hoping 
someone can shed some light on this for me.

By the way, I do have a GRE tunnel working perfectly between two other 
machines, but if I try to add a third machine, for redundancy, the new 
tunnel does not work. What I mean is, I have a working tunnel between 
"local" and "remote_0" and I would like to add another one between 
"local" and "remote_1" which is IDENTICAL to "remote_0"; I used the 
same config files on "remote_1" as on "remote_0" - minus the 
appropriate IP changes, of course - but it refuses to work.

Thanks in advance,
Sorin