PPTP ping client to client error

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http://unix.stackexchange.com – I installed pptp server on a centos 6 64bit server PPTP Server ip : PPTP Local ip : Client1 IP : centos 5 64bit Client2 IP : centos5 64bit PPTP Server can ping Client1 And client 1 can ping PPTP Server PPTP Server can ping Client2 And client 2 can ping PPTP Server The problem is client 1 can not ping Client 2 route -n on PPTP Server Destination Gateway Genmask Flags Metric Ref Use Iface UH 0 0 0 ppp0 UH 0 (HowTos)