i went out and bought a book to help me write an iptables firewall and so
far it's very helpful.  i'm just not clear on some of the terminology.  at
the beginning of my rc.firewall file, it's asking me to define some things
i've never heard of and i was hoping someone here could clarify:

IPADDR="my.ip.address"

this i understand to be my ip address: (24.79.xxx.xxx)
but what's this?

MY_ISP="my.ip.address.range"  # ISP server & NOC address range

and what are these?

iptables -A INPUT -i $INTERNET -d $SUBNET_BASE       -j DROP
iptables -A INPUT -i $INTERNET -d $SUBNET_BROADCAST  -j DROP

what's a subnet base?  or a subnet broadcast?
this is supposed to block a "directed broadcast"  what's that?

iptables -A INPUT -i $INTERNET -d $BROADCAST_DEST    -j DROP

that line also makes no sense to me.  is this for large-scale firewalls
only?  do i have to worry about this?



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