eth1 - iptables do not work

Hi,

I am new to debian. My box has eth0 - x.y.v.z and eth1 - 192.168.15.1
My problem is that I can not connect to my linux box from 192.168.15.x

I could setup the iptables for eth0. So I can connect from outside to 
x.y.v.z
I could setup the FORWARDING: 192.168.15.x can connect to the internet.

BUT the internal host can not connect to the debian server. I try ssh.
It can not connect through the external interface either.

I have no idea how to debug this problem. Thanks for your help in advance!
Tamas

iptables -L -n -v (I simplified the output)
Chain INPUT (policy DROP 1 packets, 78 bytes)
target     prot opt in     out     source               destination       
 
LOG        all  --  eth1   *       0.0.0.0/0            0.0.0.0/0         

                                                    LOG flags 0 level 6
ACCEPT     tcp  --  *      *       192.168.15.x         192.168.15.1
                                   state NEW,RELATED,ESTABLISHED tcp
dpt:83

/var/log/messages
Oct  8 18:00:51 violin kernel: [22171.104927] IN=eth1 OUT= 
MAC=00:15:e9:85:7f:4f:00:15:c5:b6:52:54:08:00 SRC=192.168.15.23 
DST=192.168.15.1 LEN=48 TOS=0x00 PREC=0x00 TTL=128 ID=17510 DF PROTO=TCP 
SPT=4576 DPT=83 WINDOW=655
35 RES=0x00 SYN URGP=0


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