RE: Antwort: IP Range Problems

[Joe Lawson <jlawson () financeware com>]

Erek,

Not being a nix' guru, I found your reference to ipcalc interesting.  Can
you tell me how you got ipcalc to display the bitmask, etc?  My version of
ipcalc will only display the network address, etc.



-----Original Message-----
From: Erek Adams [mailto:erek () snort org]
Sent: Wednesday, August 06, 2003 11:33 AM
To: m.stiefenhofer () ecofis de
Cc: rvennell () dbu edu; snort-users () lists sourceforge net
Subject: Re: Antwort: [Snort-users] IP Range Problems


On Wed, 6 Aug 2003 m.stiefenhofer () ecofis de wrote:

> > i want snort to look at the ip range of 10.5.0.1 - 10.5.4.254 but i
> > cant figure out how to input this into the ip list.  how do i put that
> > into the var HOME_NET list?  thanks for any help
>
> var HOME_NET 10.5.0.0/22

Sorry, that's not going to work.

Ipcalc is your friend!

[erek@fred]~>ipcalc 10.5.0.0/22

Address:   10.5.0.0              00001010.00000101.000000 00.00000000
Netmask:   255.255.252.0 = 22    11111111.11111111.111111 00.00000000
Wildcard:  0.0.3.255             00000000.00000000.000000 11.11111111
=>
Network:   10.5.0.0/22           00001010.00000101.000000 00.00000000
(Class A)
Broadcast: 10.5.3.255            00001010.00000101.000000 11.11111111
HostMin:   10.5.0.1              00001010.00000101.000000 00.00000001
HostMax:   10.5.3.254            00001010.00000101.000000 11.11111110
Hosts/Net: 1022                  (Private Internet RFC 1918)

It won't catch the 10.5.4.x net.  You'll need to use something else.

Since the more subnets you throw at HOME_NET the more Snort has to work,
you'll come out with:

        var HOME_NET [10.5.0.0/22,10.5.4.0/24]

Cheers!


-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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