Bhasker Allam wrote:
Hi,
I am a newbie and I was reading the howto for packet
filter. The howto has the following picture:
Incoming / \ Outgoing
-->[Routing ]--->|FORWARD|------->
[Decision] \_____/ ^
| |
v ____
___ / \
/ \ |OUTPUT|
|INPUT| \____/
\___/ ^
| |
----> Local Process ----
The input filtering is done only for local bound
packets and after the routing decision. Is the above
true ?
Yes, done for only for packets which are not forward (so
packets which are for you).
Is there a facility to perform input filtering
before the routing decision ? Thanks.
Bhasker.
Of course, see NAT, mangling, masquerading.
(http://iptables-tutorial.frozentux.net/ is good.)
