Thick Ethernet/Sun networking problems - test-drb@ccmp.vtda.org

2 Nov 2001

...
  On Nov 2,  8:03, Douglas Quebbeman wrote: 
[..snip..]

...
   If that
doesn't work, this next idea will take some time and preparation.
 Get a Windows 2000 or Windows XP machine. They allow you to change the
 machine's network address on the fly (can Linux do this?)  
 MOST systems other than Windows can do this :-)

 It's not a good idea if you need to go through all the networks numbers
 (see end of this post for the reason, if you've not realised yet). 
Someone else pointed out IFCONFIG; sorry, not a *nix guru.
I tolerate *nix as Multics' poor deformed little brother.
A useful tool, tho, no disputing that, and no Multics in
sight to brag about any more. :(

And as to the other thing you're alluding to, I never have
professed to be an expert on TCP/IP... I was assuming he'd
work with one class of networks at a time, tho...

[..snip..]

...
  Don't forget to restore the original address with
"ifconfig le0 111.0.0.1
 broadcast 111.255.255.255 netmask 255.0.0.0 up" when you've finished :-) 
What does 'broadcast' do (other than the obvious)?

...
  It'll take a while to work through the class C
range, because ping will
 take a while to time out on each network number :-)  Say two seconds per
 network, thats (224-192) * 256 * 256 * 2 seconds, about 4 million seconds,
 or just over 48 days.  Oh, and you'll probably want to refine my shell
 script to eliminate the unneccesary lines generated by ping recording
 responses from the Sun itself, and the headers.  You don't need 12 million
 extra lines in the output :-) 
Yes, I'd say he would benefit from some filtering if he
has to check all the class C range, but I was assuming 
this could take a couple of months, worst-case...

-dq