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Old 04-05-2011, 09:04 AM   #1
cryptoboss
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[FIREWALL] confused about setting up a specific rule using iptables


Hey there !!
IŽd like some help regarding this issue.
This is my scenario:
My firewall , wich is an Ubuntu server 10.10 , have 3 interfaces:
eth0(192.168.0.254):linked to the DMZ
eth1(192.168.1.254):linked to the LAN
eth3(212.217.0.1):linked to the Internet

-The DMZ have one web server with a static address (192.168.0.1).
-My LAN address range is (192.168.1.2-192.168.1.100) managed by a DHCP server in the same firwall machine.

There are some of the rules that I need to set up :
-Allow HTTP between the LAN and the internet
-Allow HTTP between the web server in the DMZ, and the internet.

So my question is :
Is there a way to tell the firewall , to redirect all incoming HTTP requests only to the web server in the DMZ ??

thanks .

Last edited by cryptoboss; 04-14-2011 at 09:20 AM.
 
Old 04-05-2011, 09:23 AM   #2
corp769
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Registered: Apr 2005
Posts: 5,818

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Code:
iptables -A FORWARD -i eth3 -p tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i eth3 --dport 80 -j DNAT --to-destination 192.168.0.1:80
Something like this? Of course you might need to edit this to fully reflect your current iptables configuration.

Last edited by corp769; 04-05-2011 at 09:24 AM.
 
Old 04-05-2011, 10:14 AM   #3
cryptoboss
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thanks a lot budy , Im seeing light now with your reply .
I believe that the proper way to learn how to set up a firewall with iptables is to read iptables manual , but im getting confused in some points in its manual like :
" match = -m matchname [per-match-options] " what does that really mean , in other words , i usually found this expression in some rules " -m state --state NEW,RELATED,ESTABLISHED " , can someone explain what is that for ??
thanks in advance.

Last edited by cryptoboss; 04-05-2011 at 10:16 AM.
 
Old 04-11-2011, 04:28 PM   #4
win32sux
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Distribution: Ubuntu
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Quote:
Originally Posted by cryptoboss View Post
im getting confused in some points in its manual like :
" match = -m matchname [per-match-options] " what does that really mean , in other words , i usually found this expression in some rules " -m state --state NEW,RELATED,ESTABLISHED " , can someone explain what is that for ??
That just says to use the state module to match packets in state NEW, RELATED, or ESTABLISHED. If a packet isn't in any of those states (for example, it's in state INVALID), it won't match the rule and will continue traversing whichever chain the rule was in.
 
Old 04-14-2011, 09:22 AM   #5
cryptoboss
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thanks
 
  


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