PPTP Router Client can't ping client router server

what’s wrong with my script, I try to connect using a proxy pptp b router and the Internet (WAN) router b using usb modem, router A as pptp server. why a router between the client and the client can not connect the router b. if between a router to router b can be connected.

# dec/15/2016 09:33:16 by RouterOS 6.37.3
# software id = IMR0-L2NF
#
/interface bridge
add arp=proxy-arp name=bridge1
/interface pptp-client
add add-default-route=yes connect-to=467a02ca39a5.sn.mynetname.net disabled=no keepalive-timeout=disabled name=pptp-out1 password=satdc user=satdc
/port
set 0 baud-rate=9600 data-bits=8 flow-control=none name=usb1 parity=none stop-bits=1
set 1 name=usb2
/interface ppp-client
add apn=indosat3g disabled=no name=ppp-out-matrix password=indosat phone=*99# port=usb2 user=indosat
add apn=internet keepalive-timeout=0 name=ppp-tsel phone=*99# port=usb2
/ppp profile
add dns-server=10.234.95.254 local-address=10.234.94.99 name=vpn use-upnp=yes
/interface bridge port
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=ether5
add bridge=bridge1 interface=wlan1
/ip address
add address=10.234.234.9/24 interface=bridge1 network=10.234.234.0
/ip cloud
set ddns-enabled=yes
/ip dns
set allow-remote-requests=yes
/ip firewall filter
add action=accept chain=input comment="PPTP FIREWALL" dst-port=1723 protocol=tcp
add action=accept chain=input comment="PPTP FIREWALL" protocol=gre
/ip firewall nat
add action=masquerade chain=srcnat out-interface=ppp-out-matrix
add action=masquerade chain=srcnat out-interface=pptp-out1
/ip route
add distance=1 dst-address=10.234.0.0/16 gateway=pptp-out1
/system clock
set time-zone-name=Asia/Jakarta
/system routerboard settings
set init-delay=0s protected-routerboot=disabled