You will have to forgive me if I say/write anything stupid,... I am a
complete newbie at firewalls. Also, I am not subscribed to this list so
please email directly or cc me on any responses, thanks.
The situation is this: I have read the firewall howto and a book called
"Linux Firewalls" by R. Ziegler and using that information I built a
firewall with ipchains. I am all ready to test my script so I hooked up
a set up as follows:
world -- hub_A -- firewall NIC_0 - firewall NIC_1 -- hub_B -- webserver
NIC_0
The firewall machine has 2 NICs (NIC 0 and NIC 1) both with valid class
C IPs on them. I set the webserver's gateway to be an IP on the
firewall (I actually tried it with both IPs but neither worked). The
gateway on the firewall is the gateway that our ISP provided for us.
The problem is that the webserver can't ping out, it can't even ping to
either of the 2 NICs on the firewall machine it is attached to via the
hub. The webserver and firewall IPs are all in the same subnet. I have
tested all 3 NICs and they are all fine. The webserver works fine as a
stand alone machine but when it's connected to the firewall I can't ping
out. I built a marvelous firewall, no one can get from the internet in
not even me, the problem is that the firewall script isn't up yet, i.e.
it's not running. I wanted to hook up a test server to make sure all my
rules worked.
Looking at the firewall howto, that person made the firewall's gateway
one of the firewall's IPs which I tried too with no luck (but seemed a
bit strange to me). I also read through the network 3&4 howto as well
as the ipchains howto with no luck.
What am I missing? Please forgive me if it's stupid and obvious. I
have done a lot of archived mails with no luck. Thanks in advance.
-anna
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