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Re: RH VirtualPC & Airport
From: "S. Ryan Quick" <ryan () phaedo com>
Date: Mon, 24 Jul 2000 17:32:22 +0000 (GMT)


On Mon, 24 Jul 2000, Matt Denton wrote:

OK maybe I'm the only one on the planet to even attempt this setup so 
I don't know how relevant this problem & solution will be, but here 

Using nmap under VirtualPC with Red Hat 6.1 on an iBook (you've 
already stopped reading, right?) with Airport, the entire VirtualPC 
program would lock up when the scan got to the OS detection phase. I 
had VirtualPC set up to share the IP address of the laptop, thinking 
that it would do multihoming as I believe it does when you use a 
Windows HD image. Instead, it actually does MASQing (I checked the 
route table) so it was really masking a private network behind the 
already-masked network address given by the Airport base station. I 
then set VirtualPC to use a unique IP and the problem cleared up.

I had some of the same issues using Debian and nmap from my laptop running the Wavelan Orinoco card through my
airport.  Problem cleared up a lot (and some of the other weird NATing problems as well) when I set the
airport to simply bridge to the ethernet and then relied on my main router/dhcp server for everything else.
It looked to me at the time like the nmap scans would quickly use all the ports available on the airport for
its PAT since it didn't seem to use the entire range from 1024:65535 -- instead it looked (according to SYN
connections on the machines I was testing anyway) that the range was more like 32768-40000 . . . 


BTW in the VirtualPC config you get to choose Airport as a networking 
option if it's available, and with it selected RHLinux still thinks 
it's using ethernet. So with ifup eth0 it grabs a unique IP address 
from the base station and you're wirelessly networking like a dream. 
Now when I'm working at home and get email notification my subnet's 
been scanned I can fire up a Linux environment and scan the offending 
host without missing a beat...

Yeah, the airport is killer . . .


Matt Denton
Network/IS Manager
UCSF Radiology

"The above statements are my own, not those of the Regents of the 
University of California. References to non-university products and 
pointers to non-university web pages do not represent endorsement by 
the Regents of the University of California." 

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