chris,
how routing works in a firewall ? to better
understand this , i assume that you are
referring to a packet filtering router, like
>From checkpoint or raptor but unlike
Gauntlet.
For such type of a firewall to function it is
important that we enable IP_FORWARDING.
what you are referring to disabling this is
only during the process when the firewall
software is being booted during start up.
now the traffic between the NIC , 3 or 4 as
the case may be , would be automagically be
taken care by the rules that you have defined
in the firewall. These rules are with refenece
to IP addresses and hence routing would be
smooth.
If you have further doubts, email me private as
such questions may be pretty elementary for a
firewall list.
BTW which firewall do you have ? I may be able
to help you out. let me know and i'll do my best
to help you.
HTH
tally
From: Chris Chen <[EMAIL PROTECTED]>
Subject: how the routing works within a multi-homed firewall box
Hi,
I got a basic question about firewall -- how the routing works within
a multi-homed firewall box.
Assuming that I have 3 network cards in the firewall computer (like NT
with Raptor or UNIX with Firewall-1 ) for the connections to
Internet, DMZ and intranet, respectively. Usually the OS level IP
forwarding
is disabled as soon as firewall software is loaded.
Now if I want to split the traffic from Internet to go to DMZ and
intranet
seperatly. How do I configure the firewall ? In my understanding, I can
configure rule set for each network card but I couldn't find out an
explicit way to direct the traffic. Does the FW software take care the
traffic directing automatically according to the available rule sets ?
Thanks in advance.
- --Chris
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