Making a router from a Linux machine
iceman_to_the_max_at_yahoo.com
Date: 02/28/05
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Date: 28 Feb 2005 09:02:29 -0800
I have a Debian Linux on one machine which has 2 Ethernet cards. I want
to make this machine to be my firewall. eth0 is connected to one small
network of about 15 computers, while eth1 is connected to another
"network" of 1 computer. I want to make my Linux machine filter
everything I want and let everything I need. However, many days working
with iptables just didn't help - I still don't have a solution. My
current solution is to use a simple Ethernet bridging, which is a
"goodbye to firewall". I have tried everything reasonable from the
iptables documentation provided. I also searched the Internet,
including these Groups. I used to make it work good in one direction,
but not vice-versa. I also am concerned if the iptables is enough,
since many things work on the lower level (ARP, RARP, DNS and many
other protocols use the OSI Layer 2 or TCP/IP network layer to provide
their services).
Since I have tried "everything" and it didn't work, the only reasonable
answer to this might be a complete configuration. If anyone has a
sample configuration which is analogous to the above, please post here
or send me a complete process of how to do this. I think no further
explanation would be necessary of the given solution, the only thing I
want is it to work. Maybe this is too much to ask, but that seems the
only solution.
Shortly, I need no masquerading, but I need to translate all eth0
addresses to eth1 and vice versa. I still want my firewall to be
functional as a workstation or a server and a part of any network,
preferrably one of eth0.
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