Hi,
I have some set of doubts in Firewall Implementation.
1) What it's meant by IN filter and Out filter?
, 2) Where exactly the firewall come into picture, when filtering the packets? (Is it
correct that, for incoming packets the filtering will be done before the forwarding
decision is taken and for outgoing packet the decision will be taken after the
forwarding . If it's correct, please give the detail about the implementation.)
3) Some firewall products supports to configure like : rule1 on circuit 2 reject in
(incoming traffic) (if) rule2 & filter1 & filter2 (true).
What exactly the above statement means. ( is the symbol "&" means if the packet
satisfies all the three (i.e. filter1 and filter2 and rule2), or any rule, be allowed
or rejected.
------ I want clear explanation for this.
4) Can i say, a set of rules combined to form a filter? ( The absolute meaning of the
filter.)
5) What are the basic criterias to form a set of filters. ( Is it based on the
services or protocols or interfaces etc.)
thanks in advance,
G.kamatchi soundaram,
Software engineer,
Future software,
480, Mount road,
Nandanam,
chennai -- 600 017.
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