iptables : subnet base and isp settings?

[Rory Campbell-Lange <rory@campbell-lange.net>]

I am setting up a machine behind a cisco router to exist as a standalone
machine in a DMZ. I'm using the Ziegler book "Linux Firewalls", but I'm
having trouble knowing what is meant by 'subnet_base' here, in the
header setting of the iptables script for a standalone host.

Example:

IPADDR="63.144.170.4"          	     # your IP address
SUBNET_BASE="63.144.179.0"	     	 # ISP network segment base address
SUBNET_BROADCAST="255.255.255.240"   # network segment broadcast address
MY_ISP="63.144.170.0/28"             # ISP server & NOC address range
NAMESERVER="53.12.192.1"             # address of a remote name server

Any clarification much appreciated.


-- 
Rory Campbell-Lange 
<rory@campbell-lange.net>
<www.campbell-lange.net>


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