Reverse Lookup Problem

[Stat]

Greetings. I am having a baffling problem with reverse lookups to my
server. My network is shaped as such;
internet <-> firewall *running portforwarding and bind9* <-> web
server

The firewall, of course, has two network cards. When I use `host' from
the web server I get;

orysia:/var/log/apache# host statnet.ca
statnet.ca has address 208.38.29.231

orysia:/var/log/apache# host 208.38.29.231
Host 231.29.38.208.in-addr.arpa not found: 3(NXDOMAIN)

orysia:/var/log/apache# host 192.168.1.1
1.1.168.192.in-addr.arpa domain name pointer
titan-fa-2-0-651.interbaun.net.

The reverse lookup on the internal NIC works???