Hello, I am constructing my ipchains ruleset at the moment following the example in R. Ziegler's Linux Firewalls. In the section on smurf attacks he uses 2 variables which seem not to be declared anywhere, $NETMASK and $NETWORK.
I have tried entering... echo $NETMASK and echo $NETWORK at the command line to see if these are variables declared elsewhere but get nothing. Ziegler's examples are based on Red Hat so I thought they *might* exist in Red Hat but not Debian, but that is a shot in the dark. Can anyone tell me what they are? I presume NETMASK is fairly obvious but don't know what to enter for NETWORK. Thanks Mike PS I have looked in the errata at www.linux-firewall-tools.com and can't see any mention of it there.
