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RV042 port forwarding / routing

Hello folks,

I'm having a really hard time tring to set up port forwarding to my LAN. Let me explain a bit of how my enviroment is set up.

RV042 -> MS-TMG (former ISA Server) -> LAN

RV042 WAN IP: Public IP (Does not matter)

RV042 LAN IP: 10.31.11.1

TMG WAN: 10.31.11.2

TMG LAN: 10.3.1.2

I've set up a port forwarding directing port 3002/TCP to 10.31.11.2 (TMGWAN) so that TMG can redirect to my LAN, but when I look at TMG Log, I see that the packages have the destination address of TMG WAN (10.31.11.2).

I don't know why RV042 is changing the destination address of the packages and for the TMG it seens that the packet is coming for him (wich is not true and it's not allowed).

I can't port forward to my lan (10.31.1.x directly bacause of the webinterface does not allow this).

I've also tried DMZ but the behavior is the same.

I've also tried uPnP but the packages are not arriving at TMG...

Here is the route table of RV042

200.XXX255.255.255.255186..XXX40ppp0
200..XXX255.255.255.255186..XXX40ppp0
186..XXX255.255.255.255*40ppp0
186..XXX255.255.255.255*45ipsec1
189.XXX255.255.255.255*40ppp0
189.XXX255.255.255.255*45ipsec1
10.31.11.0255.255.255.0*50ixp0
10.31.3.0255.255.255.0186.213.76.110ipsec1
10.31.2.0255.255.255.0186.213.76.110ipsec1
10.31.1.0255.255.255.010.31.11.22ixp0
10.31.1.0255.255.255.0*50ixp0
default0.0.0.0186.XXX40ppp0

Does anyone have a clue how can I get this thing working?

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