AirO

AirO is intended for technical and not-too-technical owners of Wi-Fi capable Android devices. It displays the health of the Wi-Fi (“Local Area”) connection, and measures the characteristics of a “Wide Area” connection to a server deeper in the network. It can be used to answer questions like:

• What’s wrong with my Wi-Fi today?

• How strong is my Wi-Fi signal?

• Is there evidence of wireless interference?

• Is the problem in the Wi-Fi connection, or out on the Internet (or corporate network)?

• Is the overall connection to the data center good enough to run my corporate apps?

For an admin guide, including instructions on setting up your Aruba network so mDNS (AirGroup) automatically configures target addresses for AirWave and iPerf servers (allowing the app as downloaded to work on different networks without user interverntion) see the Air Observer Admin Guide hosted on the Aruba Airheads Community web page http://community.arubanetworks.com/t5/Aruba-Apps/New-Admin-Guide-for-the-AirO-Air-Observer-app/td-p/229749 (or go to community.arubanetworks.com and search for "AirO").

The top “Wi-Fi and Local Area Network” section of the screen displays three measurements that show the health of the Wi-Fi connection:

• Signal Strength or RSSI in dBm

We measure signal strength first because if it’s poor, there is no chance of getting a good connection. The remedy, in simple terms, is to get closer to the access point.

• Link Speed.

The usual cause of low link speeds is poor signal strength. But sometimes, even when signal strength is good, interference on the air from Wi-Fi and non-Wi-Fi sources reduces link speeds.

• Ping. This is the familiar ICMP echo test to the network’s default gateway.

A low link speed will often cause long ping times. If link speeds are good but pings slow, it may be a long way to the default gateway over a narrow broadband connection.

The lower section of the screen displays results from tests between the device and a server computer, usually in the corporate data center or on the Internet. The address of this server is chosen from a number configured in ‘settings' – but once chosen, only one server address is used for these tests.

• Ping. There is a ping measurement to this server. It is the same ping test as above, but because this one goes farther it will normally (but not always) take longer. Again, 20msec would be fast and 500 msec would be slow.

Some networks may block ICMP (ping) traffic. In this case, the Wide Area Network ping test will always fail, but normal (e.g. Web) traffic may pass.

• Speedtest. The next tests are ‘speedtests’. For this, we use the iPerf function (iPerf v2). In a corporate context, this should be an iPerf server instance set up somewhere in the core of the network, probably a data center. Because it is a (TCP) throughput test, the figures here will never be more than about 50% of the ‘link speed’ figure for the Wi-Fi connection. The iPerf client in the app is configured to run in bidirectional mode, first an upstream test then downstream.

爱郎是用于Wi-Fi的能力Android设备的技术和不太技术拥有者。它显示了Wi-Fi（“本地”）连接的健康状况，并测量了“广域”连接到服务器在网络中更深的特点。它可以用来回答这样的问题：

•有什么毛病我今天的无线网络？

•如何强是我的Wi-Fi信号？

•是否有无线干扰的证据？

•是否在Wi-Fi连接问题，或在互联网（或企业网络）上的？

•是将数据中心的不够好，我运行的应用程序的企业的整体连接？

对于管理员指南，其中包括如何设置你的阿鲁巴网络，这样的mDNS（AirGroup）指令自动配置了AirWave和iperf的服务器的目标地址（如允许下载到工作在不同的网络，而无需用户interverntion应用程序）的空中观察管理指南托管在看阿鲁巴Airheads社区网页http://community.arubanetworks.com/t5/Aruba-Apps/New-Admin-Guide-for-the-AirO-Air-Observer-app/td-p/229749 （或去community.arubanetworks.com并搜索“爱郎”）。

顶部的“Wi-Fi无线和局域网”屏幕部分显示三次测量，显示了Wi-Fi连接的健康：

•信号以dBm强度RSSI或

我们首先测量信号强度，因为如果它是可怜的，就没有机会得到一个很好的连接。补救措施，简单来说，是更接近接入点。

•链接速度。

低链路速度通常的原因是信号强度较差。但有时，甚至当信号强度良好，在从Wi-Fi和非Wi-Fi的源气的干扰降低连接速度。

•平。这是大家熟悉的ICMP echo测试到网络的默认网关。

低链路速度往往会导致长平次。如果链接速度是好的，但坪慢，这可能是一个漫长的过程，在一个窄的宽带连接的默认网关。

屏幕显示的下段从设备和服务器计算机之间的测试结果，通常在公司数据中心或在互联网上。该服务器的地址选择从多个配置的“设置” - 但一旦选择了，只有一个服务器地址被用于这些测试。

•平。有一个平测量到该服务器。这是相同的ping测试上面，而是因为这一次越走越远，将通常（但并不总是）需要更长的时间。再次，20毫秒将是快速和500毫秒将是缓慢的。

有些网络可能会阻止ICMP（平）交通。在这种情况下，广域网Ping测试总是会失败，但正常的（如网络）流量可能会通过。

•SPEEDTEST。接下来的测试是“speedtests”。对于这一点，我们使用的iperf函数（的iperf V2）。在企业方面，这应该是建立在某处网络的核心，可能是数据中心的iperf的服务器实例。因为它是一个（TCP）吞吐量测试，该数字在这里绝不会超过50％的“链接速度”数字的Wi-Fi连接的。所述的iperf客户在该应用被配置成在双向模式下运行，则第一上游测试的下游。