On 7/3/2013 4:06 AM, Sami Halabi wrote:
Hi Julian,

I appreciate your willing to help me.

My Situation in short is:

----------- [a]     ------------------------- [b] -------------
internet B |---BGP---|84.xx.yy.1  192.168.0.1|-----|192.168.0.2/24
193.xx.yy.2|         |Aem1   Cem3      D  em0|  |  | neighbour
-----------         -------------------------   | --------------
     |                         |                 |
    [Q]                        |                 |
                         your networks        private network

I Have control only over the middle machine, so i cant establish a tunnel.
So I want it to act as MAN IN THE MIDDLE/ proxy.
every packet comes from private network to 192.168.0.1 ie:
packet hdr: src: 192.168.0.2 dst 192.168.0.1
should be translated as:
packet hdr: src: 84.xx.yy.1 dst 193.xx.yy.2
ports and data untouched.

and every packet from 193.xx.yy.2 (incoming/setup...) as:
packet hdr: src: 193.xx.yy.2 dst: 84.xx.yy.1
to be translated as:
packet hdr: src: 192.168.0.1 dst 192.168.0.2

btw: any other packet from src other than 193.xx.yy.2  to dst 84.xx.yy.1
should be dropped.

I believe this will work:

binat on em1 from 193.xx.yy.2 to 84.xx.yy.1 -> 192.168.0.1 \
  static-port tag netA
binat on em0 from 192.168.0.2 to 192.168.0.1 -> 84.xx.yy.1 \
  static-port tag netB

redir from any to 84.xx.yy.1 -> 192.168.0.2 tagged netA
redir from any to 192.168.0.1 -> 193.xx.yy.2 tagged netB
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