Layer (5,6,7) based NAT

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Subject: Layer (5,6,7) based NAT
From: "Adam" <adam@xxxxxxxxxx>
Date: Sun, 29 Apr 2007 07:42:23 -0600 (MDT)
Importance: Normal
User-agent: SquirrelMail/1.4.4

I am wondering weather this is possible. I have one port and one public IP
address lets say:

34.123.22.33:5615

If I connect using SSH I want to DNAT to port 22, if I connect using SSL I
want to DNAT to port 443, if I connect using HTTP I want to DNAT to port
80.

If this kind of upper layer protocol determination possible? If so, is
netfiter the application to do it?

Follow-Ups:
- Re: Layer (5,6,7) based NAT
  - From: Martijn Lievaart
- Re: Layer (5,6,7) based NAT
  - From: Kirk Wallace

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