wireless to wired interface bridge

[nixiao]

Hi,
 
I have installed my hostap on RedHat7.1 with kernel 2.4.17.
The wlan0 also comes out. I want use ppp0(or eth0) interface as external
interface,
while the wlan0 as internal interface. But after configuration of
iptables, wireless client still
can not ping outside ip address. 
Need I use so called wireless to wired bridge? If such, how can I choose
kernel option?
I think util also is needed.
 
Thanks
 
nixiao
 
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