In LNet (lnet-types.h), the enum constants are started from 0 and so the values are given per the position in the struct. It looks like this.

enum lnet_msg_type {
    LNET_MSG_ACK = 0,                          
    LNET_MSG_PUT,
    LNET_MSG_GET,
    LNET_MSG_REPLY,
    LNET_MSG_HELLO,                                                                                    
};

This should be fixed and be given specific values.

As Andreas pointed out - "This avoids bugs in the future if one of these constants is deleted, or if someone accidentally tries to add a value in the middle of the list, which would bump up all of the following values by one and break the network protocol compatibility."