Hi,
I understand how to do network address and port translation in Linux
in a many to one type setup that you might normally get on a ADSL
line.
What I have not done before is network address translation but
preserving the port numbers.
So, if the private side of the box is 192.168.1.0/24
and the public side of the box should make the private side look like
158.153.1.0/24, how is this done in Linux.
E.g.
Private PC on 192.168.1.1 sends a packet with source address
192.168.1.1, source port 12000, destination port 80.
Public side sees a session coming from 158.152.1.1 source port 12000,
destination port 80.
Private PC on 192.168.1.2 sends a packet with source address
192.168.1.2, source port 12000, destination port 80.
Public side sees a session coming from 158.152.1.2 source port 12000,
destination port 80.
etc. for each PC on the private network.
As you can see, only the IP address is getting translated. The port
numbers are preserved.
Has anyone tried this on Linux?
Does it work?
Kind regards
James
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