FreeBSD 5.2 Router Setup

[Michael Madden]

I am trying to setup a pc with FreeBSD 5.2 as a
router.  I've got two NICs setup. My laptop
can ping the LAN side of the router (192.168.200.1),
and it can also ping the WAN side of the router (172.16.20.10).
However, I cannot get past the WAN side of the router to
other pcs or the internet, but if I login to the
router, I can see other pcs and the internet.
It almost seems like IP forwarding isn't working
isn't working on the router.

Here is /etc/rc.conf:

ifconfig_xl0="inet 172.16.20.10  netmask 255.255.0.0"
ifconfig_xl1="inet 192.168.200.1  netmask 255.255.255.0"
defaultrouter="172.16.255.1"
gateway_enable="YES"
hostname="pcmadden.cms-stl.com"
linux_enable="YES"
moused_enable="YES"
ntpdate_enable="YES"
ntpdate_flags="time-ext.missouri.edu"
sshd_enable="YES"
usbd_enable="YES"

Here is the output of ifconfig:
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         options=b<RXCSUM,TXCSUM,VLAN_MTU>
         inet 172.16.20.10 netmask 0xffff0000 broadcast 172.16.255.255
         inet6 fe80::201:2ff:fe3f:5823%xl0 prefixlen 64 scopeid 0x1
         ether 00:01:02:3f:58:23
         media: Ethernet autoselect (100baseTX <full-duplex>)
         status: active
xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         options=b<RXCSUM,TXCSUM,VLAN_MTU>
         inet 192.168.200.1 netmask 0xffffff00 broadcast 192.168.200.255
         inet6 fe80::210:5aff:fea8:fd83%xl1 prefixlen 64 scopeid 0x2
         ether 00:10:5a:a8:fd:83
         media: Ethernet autoselect (none)
         status: no carrier
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
         inet 127.0.0.1 netmask 0xff000000
         inet6 ::1 prefixlen 128
         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3

Here is the output of netstat -r:
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            guardian-int       UGS         0      516    xl0
localhost          localhost          UH          0        2    lo0
172.16             link#1             UC          0        0    xl0
stldns             00:06:5b:8b:dd:9f  UHLW        0       43    xl0   1059
hulk               00:30:d3:01:98:f1  UHLW        0        6    xl0
light              00:c0:4f:a1:2b:f8  UHLW        0        3    xl0   1057
legolas            00:06:5b:84:44:c5  UHLW        0     1325    xl0    836
guardian-int       00:a0:8e:1d:bd:b4  UHLW        1        0    xl0    660
192.168.200        link#2             UC          0        0    xl1

Internet6:
Destination        Gateway            Flags      Netif Expire
localhost.cms-stl. localhost.cms-stl. UH          lo0
fe80::%xl0         link#1             UC          xl0
fe80::201:2ff:fe3f 00:01:02:3f:58:23  UHL         lo0
fe80::%xl1         link#2             UC          xl1
fe80::210:5aff:fea 00:10:5a:a8:fd:83  UHL         lo0
fe80::%lo0         fe80::1%lo0        U           lo0
fe80::1%lo0        link#3             UHL         lo0
ff01::             localhost.cms-stl. U           lo0
ff02::%xl0         link#1             UC          xl0
ff02::%xl1         link#2             UC          xl1
ff02::%lo0         localhost.cms-stl. UC          lo0

Any help figuring this out would be greatly appreciated.

Thanks,
Michael