problem with getway

[AETCH]

I have install freebsd 4.x,and have two netcards.
I want it as getway.
I have config "gateway_enable=YES"  in rc.conf,and then reboot.
[a pc]--------[freebsd]-------[b pc]
After reboot , I try to use a pc to ping b pc ,it`s not work ,but a pc and
b pc can ping freebsd successful,why?
Please give me a hand.
Thanks!!
 
aetch


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