Did I take down the whole Middle School with NAT?

[Joseph Hartman]

Sweet, thanks Gavin. After I reconnected everything on Thursday we went off
without a hitch, but I'll be sure to monitor the server with that code just
to be safe. Since we're a charter school and don't actually own our building
or the network inside its walls I can't set up a site wide LTSP server. Thus
I have small LTSP setups in classrooms all around campus. I'm guessing
someone reconnected their classroom LTSP server incorrectly and then didn't
turn it on until last week or something which caused the problems. Like I
said, I've been running my own classroom LTSP server with identical
configuration to that of the lab in my own room since before school started
and there haven't been any problems at all. Thanks once again for the help.
-joe

On Sat, Sep 12, 2009 at 3:19 AM, Gavin McCullagh <gmccullagh at gmail.com>wrote:

>
> One suggestion if you want to be clear.  Run the following command on the
> ltsp server
>
>        sudo tcpdump -vn -i eth0 udp port 67 or port 68
>
> this will capture all dhcp requests and replies which hit your eth0
> interface (you might need to use eth1 if that's the interface on your main
> network).  If you watch that for a while you should see dhcp requests
> and responses and who they are coming from and to.  You will see for sure
> then if your server ever responds to dhcp requests on that interface.
>
> Gavin
>
>
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