iptables and their use..

[Ted Gervais <ve1drg@av.eastlink.ca>]

I am looking at using iptables and have been reading. I have an understanding 
on how to set up some basic commands to make a firewall but what I have a 
problem with, is what do I filter?  

I don't know what is important (to me) to filter.  I know we all need some 
sort of firewall to protect ourselfs and systems against 'sutff'  out there, 
but just what is that.  I suppose one could start with making certain subnets 
available to myself and deny/reject all others, but I am not sure that is how 
to go about it..

So - as a general rule, what does one do?  What do people block and what do 
they accept??

-- 
Ted Gervais
Coldbrook, Nova Scotia Canada.
1-902-679-2253