DNAT from localhost (127.0.0.1)
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pts
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Published on 2013-11-07T21:02:35Z
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2013/11/07
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I'd like to set up a TCP DNAT from 127.0.0.1, port 4242 to 11.22.33.44, port 5353 on Linux 3.x (currently 3.2.52, but I can upgrade if needed).
It looks like the simple DNAT rule setup doesn't work, telnet 127.0.0.1 4242
hangs for a minute in Trying 127.0.0.1...
, and then it times out. Maybe it's because the kernel is discarding the returning packets (e.g. SYN+ACK), because it considers them Martian. I don't need an explanation why the simple solution doesn't work, I need a solution, even if it's complicated (e.g. it involves creating may rules).
I could set up a usual DNAT from another local IP address, outside the 127.0.0.0/8
network, but now I need 127.0.0.1 as the destination address. I know that I can set up a user-level port forwarding process, but now I need a solution which can be set up using iptables
and doesn't need helper processes.
I was googling for this for an hour. It was asked multiple times, but I couldn't find any working solutions.
Also there are many questions about DNAT to 127.0.0.1, but I don't need that, I need the opposite.
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