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Problems with my network

Hello,
I have a problem with my network at work. I will describe short the installation of my network and what problem I have.
It is a cluster with sereral pc (only debian systems) with one server, which serves as fileserver, dhcp server, local dns-server and so on. Then I set up an extra loginserver and only the server and the loginserver have an extern IP address. All the nodes of the cluster have ips in the local network and the loginserver and fileserver have external ips and internal ips. between the loginserver and fileserver is also a firewall.
Now the Problem: Everything works fine, I mean that i can reach every computer from any pc in the local network and i can reach the loginserver and fileserver from extern. But I can't reach the loginserver from the fileserver. I can't ping, or ssh to it, when I use the internal IP address of the loginserver. What strange is, that i can ping from the loginserver to the fileserver without any Problem. I tried to find the problem, but I don't get it.
(external addresses are 134.2.*.* and internal addresses are 192.168.1.*, fileserver has 192.168.1.1 and loginserver 192.168.1.2) 

Some output from the loginserver:

lspci -v | grep Ether
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11) Subsystem: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11) Subsystem: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express 

ifconfig -v
eth0 Link encap:Ethernet HWaddr 00:E0:81:2D:A6:E2 inet addr:134.2.180.192 Bcast:134.2.255.255 Mask:255.255.0.0 
         inet6 addr: fe80::2e0:81ff:fe2d:a6e2/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:901063 errors:0 dropped:0 overruns:0 frame:7
         TX packets:2299546 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:150252974 (143.2 MiB)  TX bytes:3298738644 (3.0 GiB)
         Interrupt:169
eth1 Link encap:Ethernet HWaddr 00:E0:81:2D:A6:E3 inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 
         inet6 addr: fe80::2e0:81ff:fe2d:a6e3/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:3378341 errors:0 dropped:0 overruns:0 frame:0
         TX packets:2137499 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:3873940232 (3.6 GiB)  TX bytes:272342735 (259.7 MiB)
         Interrupt:169


route -en
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 134.2.180.191 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 134.2.180.193 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 134.2.0.0 134.2.180.191 255.255.0.0 UG 0 0 0 eth0 0.0.0.0 134.2.180.191 0.0.0.0 UG 0 0 0 eth0 


some output from fileserver:
ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:30:48:C3:FE:2A inet addr:134.2.180.193 Bcast:134.2.255.255 Mask:255.255.0.0 
         inet6 addr: fe80::230:48ff:fec3:fe2a/64 Scope:Link
         UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
         RX packets:802938552 errors:0 dropped:0 overruns:0 frame:0
         TX packets:597120351 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
RX bytes:850023992338 (791.6 GiB) TX bytes:366997720384 (341.7 GiB)
eth1 Link encap:Ethernet HWaddr 00:30:48:C3:FE:2B inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 
         inet6 addr: fe80::230:48ff:fec3:fe2b/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:9751734720 errors:0 dropped:0 overruns:0 frame:0
         TX packets:7767688483 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
RX bytes:9357536869878 (8.5 TiB) TX bytes:3240504190213 (2.9 sit0 Link encap:IPv6-in-IPv4 NOARP MTU:1480 Metric:1 
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
TiB)


route -en
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.1.2 0.0.0.0 255.255.255.255 UH 0 0 0 eth1 134.2.180.191 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 134.2.180.192 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 134.2.0.0 134.2.180.191 255.255.0.0 UG 0 0 0 eth0 0.0.0.0 134.2.180.191 0.0.0.0 UG 0 0 0 eth0
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