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Redirect using ipchain

Dear experts,
 
How to redirect the request cominig from x.x.x.x to the firewall server for port xxxx to x.x.x.x.:xx which is available in my internal network.  Using ipchain    command and then how to get the ipmasqadm package from where.


With advance thanks,
M.Saran.
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km_saran
Asked:
km_saran
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1 Solution
 
DABOMBCommented:
so lemme get this straight? you need to get say a web port (80) to redirect back from the firewall into the internal network to a certain port? so that all requests on such port go through it?
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DABOMBCommented:
if the above is what you are trying to do this would do it, substitute hostnames and ports

iptables -t nat -A PREROUTING -i eth0 -s ! <OTHER_HOST> -p tcp --dport <REQUEST_PORT> -j DNAT --to <OTHER_HOST>:<PORT_TO>

iptables -t nat -A POSTROUTING -o eth0 -s <local-network> -d <OTHER_HOST> -j SNAT --to <THIS_HOST>

iptables -A FORWARD -s <local-network> -d <OTHER_HOST> -i eth0 -o eth0 -p tcp --dport <PORT_TO> -j ACCEPT
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escheiderCommented:
dabomb, hes using ipchains, not iptables

download ipmasqadm from http://www.tuxfinder.com/thematic/tree.php3?category=92

compile it, and install --

then in your firewall script add the following

ipmasqadm portfw -a -P tcp -L <externalip> 80 -R <internalip> 80

Where externalip is the ip of your external interface and internalip is the machine you want to forward requests to.  Ive used port 80 in the example to forward http requests
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DABOMBCommented:
oh, escheider's right, well either way would do it, iptables is for the newer or older kernels one of the two, it depends on which kernel version is on that disk, and it may be that one of the two is already installed.
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CleanupPingCommented:
km_saran:
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