int off = 0;
        int tot = buf.getLength() - 24;
        while ( off < tot ) {
            int fragSize = tot - off;
            if ( ( 24 + fragSize ) > this.max_xmit ) {
                // need fragementation
                msg.flags &= ~DCERPC_LAST_FRAG;
                fragSize = this.max_xmit - 24;
            }
            else {
                msg.flags |= DCERPC_LAST_FRAG;