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07.07.2008 at 02:53PM PDT, ID: 23544923
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9.1

How do I NAT a single host from one internal network to another?

Asked by kamermans in IP Tables/IP Chains, Linux Networking

I have a host on my network that has a rouge IP address: 131.167.45.25 - this host is on my internal network and is not publicly accessible.  I'm trying to figure out how to change it's IP (that's another story), but in the meantime I want to be able to access this machine without putting routes or ip aliases on the clients.

Remember, this machine is on my internal network (172.16.0.0/24 - yes /24, not /16).

I have a number of Linux servers on this network and I would like to use one of them to get access to this 131.167 machine.  My idea was to give a Linux box 2 IP aliases, one in my subnet (lets say 172.16.0.10) and one in it's subnet (131.167.45.10).  Now the Linux box can talk to everybody (please note that I can't just add a static route to the new network because I don't have access to add routes to my default gateway).  I should be able to use NAT (either via iproute2 or iptables/netfilter) to send all traffic bound for 172.16.20.10 to the rouge machine at 131.167.45.25.  This works fine using Netfilters' "-j DNAT" target, but how do I get the traffic back from 131.167.45.25 to my client if I don't know their IP?  This should be quite easy since it's the same thing that happens when NATing a network.Start Free Trial
 
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[+][-]07.07.2008 at 02:58PM PDT, ID: 21948998

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[+][-]07.07.2008 at 02:59PM PDT, ID: 21949004

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[+][-]07.07.2008 at 03:05PM PDT, ID: 21949051

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[+][-]07.07.2008 at 03:12PM PDT, ID: 21949098

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[+][-]07.07.2008 at 04:27PM PDT, ID: 21949464

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[+][-]07.08.2008 at 01:14AM PDT, ID: 21951820

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Zones: IP Tables/IP Chains, Linux Networking
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Solution Provided By: Blaz
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.08.2008 at 04:49AM PDT, ID: 21952763

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