Hi all I am still relative new to arduino and CAN bus shield, but currently, i have 2 bought 2 can bus shield from sparkfun and are trying to make them to communicate to one another. Currently i am using the code from this website.
http://www.seeedstudio.com/wiki/CAN-BUS_Shield
I am able to send message out, but unable to receive the message.
Any help will be greatly appreciated. 
the connection between CANH-CANH and CANL-CANL, do i need a 120 ohm resistor?
I would like to play with the CANbus shields but need to finish up some other projects first. I therefore cannot answer your question directly. If you search the forums for “CANbus” I think you will find more information.
Good luck,
That shield uses a high speed CAN transceiver, so you want 120 ohm resistors at the farthest ends of the bus.
More details on the physical CAN options and their termination is among other places here
Hi. omg. i connected the resistors in series instead of parallel. now i can receive the message. Thank you all! 
Please go back and mark your thread as SOLVED. thx