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Which interface i need to assign ip filer rules?

Posted on 2008-06-20
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Last Modified: 2010-04-21
I have three Ethernet adapter in my linux system.

eth0, eth1 , localhost

Which ethernet adapter i need to give the filtering rules?

Can someone explain elaborate with reasons?
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Question by:jaisonshereen
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by:torquedtech
ID: 21835590
Hi jaisonshereen,

you will want to enable the ip filter rules on the device that currently has the ethernet cable plugged into it.

We are only interested in 2 interfaces eth0, and eth1, loopback is not an interface we need to worry about for this question.

if you run "ifconfig" (depending on your version/flavor of linux)
look for the interface that has an ip address. That is the one you want to enable the filter rules on

if they both have ip addresses, please let me know and I will help instruct from there.
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Author Comment

by:jaisonshereen
ID: 21835604
Sorry forgot to mention.

eth0 is for private ip
eth1 is for public ip

what will be my cable is linked ..private or public?
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torquedtech earned 2000 total points
ID: 21835624
your public ip is the the one that you will want to filter (eth1)

your private ip we believe is secure so we will trust it, however, the public interface is where we want the filter so that it will block unwanted people from entering.

for example a house, public interface is front door, private interface is back door.
we let friends come in the back door because they are trusted, but we must filter people at the front door (public) becuase we do not know who they are

make sense?

Thanks
~Dan

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Author Comment

by:jaisonshereen
ID: 21835639
yes.. so which interface will be the cable connected?
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Expert Comment

by:torquedtech
ID: 21835645
it will go to interface eth1
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