FreeBSD gateway

[Constantine]

Hello!
I have installed FreeBSD 4.7 recently, and it seems it does not want to work as a gateway. I have two network cards in my FreeBSD computer, fxp0 for LAN and sis0 for the cable modem. I am new to FreeBSD, so I am confused what the difference between gateways and routers is (I was thinking they link to the same thing). I can ping my FreeBSD box from winxp, I can ping internet from remote session to FreeBSD, but I cannot ping internet from my winxp.
My winxp has ip 192.168.0.1, netmask 255.255.255.0, and gateway 192.168.0.18 settings. Now FreeBSD /etc/rc.conf follows:

gateway_enable="YES"
kern_securelevel_enable="NO"
nfs_reserved_port_only="YES"
ifconfig_sis0="DHCP"
ifconfig_fxp0="inet 192.168.0.18 netmask 255.255.255.0"
#router_enable="YES"
# from handbook
gateway_enable="YES"
firewall_enable="YES"
firewall_type="OPEN"
natd_enable="YES"
natd_interface="sis0"
natd_flags=""
#/ handbook

The last two lines from dmesg:
IP packet filtering initialized, divert disabled, rule-based forwarding enabled, default to deny, logging disabled
ip_fw_ctl: invalid command

%netstat -rn
Routing tables

Internet:
Destination Gateway Flags Refs Use Netif Expire
default 68.105.xxx.x UGSc 2 0 sis0
68.105.xxx/24 link#1 UC 1 0 sis0
68.105.xxx.x 00:03:xx:xx:xx:xx UHLW 3 0 sis0 1197
68.105.xxx.xxx 127.0.0.1 UGHS 0 0 lo0
127.0.0.1 127.0.0.1 UH 1 0 lo0
192.168.0 link#2 UC 1 0 fxp0
192.168.0.1 00:04:xx:xx:xx:xx UHLW 3 28742 fxp0 1005

Thank you!

--
Constantine


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