PPP and routing

Hello all,

I have a question about PPP on AS/400.

   PC(A)
     |
----------------------(LAN)
         |
       AS/400---PPP---PC(B)


AS/400 is configred as PPP Server. The PC(B) has a connection via 
PPP to AS/400. From PC(B), ping to AS/400 runs successfully. But 
ping to PC(A) does not reach. 

I saw TCP/IP Configuration and Reference(SC41-5420-02). At 4.19.5 
Example: Remote LAN Access with Transparent Subnetting, it says 
AS/400 can do proxyarp between LAN interface and PPP interface. 
But it does not work. 
 
Does anyone succeed to route to LAN over AS/400 PPP?


Thanks,
--
Ken Yamasaki 
Yokohama Kanagawa,JAPAN
ML/400(in Japanese only)=>http://www.tama.or.jp/~yamaken/ml400/ 
BTW, if my English is too poor to your understanding,
would you point out any errors to me?
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