[Durham] Excluding an IP range in arpwatch

[Dougie Nisbet]

I just discovered arpwatch a few weeks ago and quite like it. I'm 
looking into its potential for continuous running and detecting IP 
conflicts. This is on 192.168.1.1-192.168.1.254 range. About half of 
this is in a DHCP range so I want to tell arpwatch to exclude that. 
Looking at the man page and some web sources I can see that it's the -z 
flag that I need, but I'm uncertain on the syntax. I don't think the man 
page is that clear. Discussion on the web suggests that it's a netmask 
required here and also that it might be necessary to precede running the 
command with putting some stuff in environment variables.

To cut a long question short, has anyone used arpwatch and excluded an 
IP range and could give me an example usage? e.g. excluding everything 
from 192.168.1.195 - 192.168.1.255?

Thanks

Dougie