Port forward back to wan interface, RT-N66U

[Niels]

Heey guys,

I have some shirtty setup atm. Let me explain.

I have a server running which is directly connected to the modem. on the router, which is also connected to the modem, I have script running which automatically sends a WOL when there is traffic for the server ip. So in order to have the router see this traffic the modem sends all the traffic on port x to the router which then has to forward port x to the server back on the same interface(WAN).

ip's:
modem: 192.168.3.254
server 192.168.3.115
router wan if: 192.168.3.1
router lan: 192.168.4.1
computers connected to router are on 192.168.4.xxx /24

Router firmware is latest official: 3.0.0.4.380_7378

Now when I try to access the server, it doesnt work.
dmesg gives the following report:

DROP <4>DROP IN=eth0 OUT=eth0 <1>SRC=x.x.x.x DST=192.168.3.115 <1>LEN=48 TOS=0x00 PREC=0x00 TTL=124 ID=20131 DF PROTO=TCP <1>SPT=53983 DPT=8096 SEQ=2012543468 ACK=0 WINDOW=8192 RES=0x00 SYN URGP=0 OPT (020405B401010402)
DROP <4>DROP IN=eth0 OUT=eth0 <1>SRC=x.x.x.x DST=192.168.3.115 <1>LEN=48 TOS=0x00 PREC=0x00 TTL=124 ID=20132 DF PROTO=TCP <1>SPT=53982 DPT=8096 SEQ=1890599052 ACK=0 WINDOW=8192 RES=0x00 SYN URGP=0 OPT (020405B401010402)
DROP <4>DROP IN=eth0 OUT=eth0 <1>SRC=x.x.x.x DST=192.168.3.115 <1>LEN=48 TOS=0x00 PREC=0x00 TTL=124 ID=20134 DF PROTO=TCP <1>SPT=53984 DPT=8096 SEQ=259767605 ACK=0 WINDOW=8192 RES=0x00 SYN URGP=0 OPT (020405B401010402)

All the packets get dropped. Why is this? How to get them accepted?

Thanks for the help,
Niels

p.s.
Router and modem are not in the same room.
Server shares a room with the modem.