SuSEfirewall2 question regarding FW_FORWARD_MASQ

I have a setup that requires external machines to access an application on an internal machine (masqueraded) when using a specific protocol. A packet sent to the firewall (IP and protocol 200) should be redirected to the internal machine 192.168.0.40. Using tcp or udp instead of protocol 200 would work, but why does not other protocols work??? I'm using... FW_DEV_EXT="eth0" FW_DEV_INT="eth1" FW_ROUTE="yes" FW_MASQUERADE="yes" FW_MASQ_NETS="192.168.0.0/24" FW_FORWARD_MASQ="0/0,192.168.0.40,200" If I can't forward other protocols than udp/tcp can I solve this setup in a different way??? I mean instead of installing Solaris, since that OS allows you to forward other protocols (I heard...). Thanks, Magnus