使用定向无线电中继，吞吐量下降到接近零

10

我们正在使用以下1Gbit / s无线电链路设置：位置A：

  • 具有1Gbit / s符号的Internet网关。纤维
  • 我们的大多数服务器包括dhcp，dns，文件服务器（smb），voip服务器，Exchange服务器
  • 55位客户/用户
  • 定向无线电中继A（Lightpointe AireLink 60 SX）-1Gbits / s

位置B：

  • 一台文件服务器（smb）
  • 30位客户/用户
  • 定向无线电中继B（Lightpointe AireLink 60 SX）-1Gbits / s

位置A和B之间的距离为177米。两个位置共享一个子网：用于客户端和服务器的192.168.0.0/24，VoIP电话位于10.6.3.0/24子网中（两个位置也共享）。因此，两个位置之间都没有路由，并且无线电链路正在充当网桥。

定向无线电继电器A的设置：

Link Status: UP
Mode: Data
RSSI, dBm: -46
RSSI Alarm Thrshld, dBm: -60
RSSI Alarm Clear, dBm: -50
RF Link: high    
TX RF Band, GHz: 62.5
RX RF Band, GHz: 59.5
TX Power, dBm: -7
Distance: Very short
ACM: Enabled
Modulation: 16QAM 5/8
TX Lock: normal lock
RX Lock: normal lock
Modem Lock: locked

定向无线电继电器B的设置：

Link Status: UP
Mode: Data
RSSI, dBm: -49
RSSI Alarm Thrshld, dBm: -60
RSSI Alarm Clear, dBm: -50
RF Link: low
TX RF Band, GHz: 59.5
RX RF Band, GHz: 62.5
TX Power, dBm: -4
Distance: Very short
ACM: Enabled
Modulation: 16QAM 5/8
TX Lock: normal lock
RX Lock: normal lock
Modem Lock: locked

RF Link RX错误定向无线电继电器A：0 RF Link RX错误定向无线电继电器B：0

我们在位置B遇到以下问题：

  • VoIP音频中断（一次最多仅一个方向，每次大约3秒）
  • smb吞吐量有时会下降到5 Mbit / s甚至更低
  • 传出邮件（交换服务器）有时非常慢
  • 互联网连接速度慢

文件传输速率降至零，并且文件传输因0x8007003B（位置A-> B）而中止： 示例1：文件传输速率下降到零并且文件传输中止 示例2：文件传输速率降至零并且文件传输中止

总结一下：似乎是造成吞吐量大幅下降的原因，但我们不知道这里发生了什么。我们安装了两个带有两个桥接以太网端口的“中间人”服务器，每个服务器用于在无线链路数据端口和将其连接到本地网络的交换机端口之间ntopng以及tshark两个位置处收集数据。

从位置A的客户端访问位置A的服务器以及从位置B的客户端访问位置B的服务器都没有问题。

  • server.location-a = 192.168.0.149
  • server.location-b = 192.168.0.242

iperf显示出良好的数据速率：

user@location-a:~$ iperf -c server.location-b -i 2 -t 20
------------------------------------------------------------
Client connecting to server.location-b, TCP port 5001
TCP window size:  512 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.149 port 63378 connected with 192.168.0.242 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 2.0 sec   198 MBytes   832 Mbits/sec
[  3]  2.0- 4.0 sec   195 MBytes   817 Mbits/sec
[  3]  4.0- 6.0 sec   198 MBytes   831 Mbits/sec
[  3]  6.0- 8.0 sec   199 MBytes   836 Mbits/sec
[  3]  8.0-10.0 sec   165 MBytes   692 Mbits/sec
[  3] 10.0-12.0 sec   198 MBytes   829 Mbits/sec
[  3] 12.0-14.0 sec   195 MBytes   817 Mbits/sec
[  3] 14.0-16.0 sec   193 MBytes   810 Mbits/sec
[  3] 16.0-18.0 sec   200 MBytes   838 Mbits/sec
[  3] 18.0-20.0 sec   199 MBytes   833 Mbits/sec
[  3]  0.0-20.0 sec  1.89 GBytes   814 Mbits/sec

双向--tradeoff（-r）

user@location-a:~$ iperf -c server.location-b -i 2 -t 20 -r
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-b, TCP port 5001
TCP window size:  512 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.149 port 49535 connected with 192.168.0.242 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 2.0 sec   191 MBytes   801 Mbits/sec
[  4]  2.0- 4.0 sec   196 MBytes   824 Mbits/sec
[  4]  4.0- 6.0 sec   196 MBytes   822 Mbits/sec
[  4]  6.0- 8.0 sec   193 MBytes   809 Mbits/sec
[  4]  8.0-10.0 sec   196 MBytes   821 Mbits/sec
[  4] 10.0-12.0 sec   187 MBytes   783 Mbits/sec
[  4] 12.0-14.0 sec   164 MBytes   690 Mbits/sec
[  4] 14.0-16.0 sec   166 MBytes   697 Mbits/sec
[  4] 16.0-18.0 sec   191 MBytes   803 Mbits/sec
[  4] 18.0-20.0 sec   196 MBytes   820 Mbits/sec
[  4]  0.0-20.0 sec  1.83 GBytes   787 Mbits/sec
[  4] local 192.168.0.149 port 5001 connected with 192.168.0.242 port 45775
[  4]  0.0- 2.0 sec   221 MBytes   928 Mbits/sec
[  4]  2.0- 4.0 sec   221 MBytes   929 Mbits/sec
[  4]  4.0- 6.0 sec   222 MBytes   933 Mbits/sec
[  4]  6.0- 8.0 sec   222 MBytes   933 Mbits/sec
[  4]  8.0-10.0 sec   222 MBytes   932 Mbits/sec
[  4] 10.0-12.0 sec   188 MBytes   789 Mbits/sec
[  4] 12.0-14.0 sec   223 MBytes   935 Mbits/sec
[  4] 14.0-16.0 sec   222 MBytes   932 Mbits/sec
[  4] 16.0-18.0 sec   223 MBytes   934 Mbits/sec
[  4] 18.0-20.0 sec   222 MBytes   933 Mbits/sec
[  4]  0.0-20.0 sec  2.14 GBytes   918 Mbits/sec

反转iperf服务器和客户端：

user@location-b:~# iperf -c server.location-a -i 2 -t 20
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.242 port 45778 connected with 192.168.0.149 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 2.0 sec   220 MBytes   921 Mbits/sec
[  3]  2.0- 4.0 sec   218 MBytes   916 Mbits/sec
[  3]  4.0- 6.0 sec   217 MBytes   910 Mbits/sec
[  3]  6.0- 8.0 sec   221 MBytes   926 Mbits/sec
[  3]  8.0-10.0 sec   213 MBytes   892 Mbits/sec
[  3] 10.0-12.0 sec   188 MBytes   787 Mbits/sec
[  3] 12.0-14.0 sec   218 MBytes   916 Mbits/sec
[  3] 14.0-16.0 sec   218 MBytes   916 Mbits/sec
[  3] 16.0-18.0 sec   219 MBytes   919 Mbits/sec
[  3] 18.0-20.0 sec   223 MBytes   937 Mbits/sec
[  3]  0.0-20.0 sec  2.10 GBytes   904 Mbits/sec

用-d双重测试：

user@location-b:~# iperf -c server.location-a -i 2 -t 10 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size:  255 KByte (default)
------------------------------------------------------------
[  5] local 192.168.0.242 port 45784 connected with 192.168.0.149 port 5001
[  4] local 192.168.0.242 port 5001 connected with 192.168.0.149 port 52423
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0- 2.0 sec   210 MBytes   882 Mbits/sec
[  4]  0.0- 2.0 sec  45.7 MBytes   192 Mbits/sec
[  5]  2.0- 4.0 sec   172 MBytes   722 Mbits/sec
[  4]  2.0- 4.0 sec  50.8 MBytes   213 Mbits/sec
[  5]  4.0- 6.0 sec   205 MBytes   859 Mbits/sec
[  4]  4.0- 6.0 sec  65.5 MBytes   275 Mbits/sec
[  5]  6.0- 8.0 sec   215 MBytes   901 Mbits/sec
[  4]  6.0- 8.0 sec  73.0 MBytes   306 Mbits/sec
[  5]  8.0-10.0 sec   223 MBytes   934 Mbits/sec
[  5]  0.0-10.0 sec  1.00 GBytes   860 Mbits/sec
[  4]  8.0-10.0 sec  55.0 MBytes   231 Mbits/sec
[  4]  0.0-10.0 sec   290 MBytes   243 Mbits/sec

在启动smb文件传输位置A-> B的同时进行两个方向的操作（从位置B-> A启动smb文件传输没有问题：

user@location-b:~# iperf -c server.location-a -i 1 -t 30 -r
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size:  238 KByte (default)
------------------------------------------------------------
[  5] local 192.168.0.242 port 45787 connected with 192.168.0.149 port 5001
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0- 1.0 sec   111 MBytes   934 Mbits/sec
[  5]  1.0- 2.0 sec   109 MBytes   913 Mbits/sec
[  5]  2.0- 3.0 sec   111 MBytes   928 Mbits/sec
[  5]  3.0- 4.0 sec   111 MBytes   932 Mbits/sec
[  5]  4.0- 5.0 sec   111 MBytes   928 Mbits/sec
[  5]  5.0- 6.0 sec   101 MBytes   844 Mbits/sec
[  5]  6.0- 7.0 sec  73.8 MBytes   619 Mbits/sec
[  5]  7.0- 8.0 sec   111 MBytes   929 Mbits/sec
[  5]  8.0- 9.0 sec   109 MBytes   916 Mbits/sec
[  5]  9.0-10.0 sec   112 MBytes   938 Mbits/sec
[  5] 10.0-11.0 sec   109 MBytes   918 Mbits/sec
[  5] 11.0-12.0 sec   111 MBytes   933 Mbits/sec
[  5] 12.0-13.0 sec   106 MBytes   891 Mbits/sec
[  5] 13.0-14.0 sec  85.8 MBytes   719 Mbits/sec
[  5] 14.0-15.0 sec   112 MBytes   935 Mbits/sec
[  5] 15.0-16.0 sec   111 MBytes   934 Mbits/sec
[  5] 16.0-17.0 sec   110 MBytes   924 Mbits/sec
[  5] 17.0-18.0 sec   112 MBytes   937 Mbits/sec
[  5] 18.0-19.0 sec   112 MBytes   940 Mbits/sec
[  5] 19.0-20.0 sec   112 MBytes   935 Mbits/sec
[  5] 20.0-21.0 sec   111 MBytes   928 Mbits/sec
[  5] 21.0-22.0 sec   110 MBytes   923 Mbits/sec
[  5] 22.0-23.0 sec  79.1 MBytes   664 Mbits/sec
[  5] 23.0-24.0 sec   112 MBytes   937 Mbits/sec
[  5] 24.0-25.0 sec   112 MBytes   936 Mbits/sec
[  5] 25.0-26.0 sec   111 MBytes   934 Mbits/sec
[  5] 26.0-27.0 sec   112 MBytes   937 Mbits/sec
[  5] 27.0-28.0 sec   111 MBytes   928 Mbits/sec
[  5] 28.0-29.0 sec   112 MBytes   938 Mbits/sec
[  5] 29.0-30.0 sec   112 MBytes   941 Mbits/sec
[  5]  0.0-30.0 sec  3.15 GBytes   901 Mbits/sec
[  4] local 192.168.0.242 port 5001 connected with 192.168.0.149 port 52898
[  4]  0.0- 1.0 sec   104 MBytes   872 Mbits/sec
[  4]  1.0- 2.0 sec   103 MBytes   867 Mbits/sec
[  4]  2.0- 3.0 sec  97.9 MBytes   822 Mbits/sec
[  4]  3.0- 4.0 sec  95.9 MBytes   804 Mbits/sec
[  4]  4.0- 5.0 sec   101 MBytes   851 Mbits/sec
[  4]  5.0- 6.0 sec   102 MBytes   860 Mbits/sec
[  4]  6.0- 7.0 sec   103 MBytes   867 Mbits/sec
[  4]  7.0- 8.0 sec   103 MBytes   868 Mbits/sec
[  4]  8.0- 9.0 sec  50.0 MBytes   419 Mbits/sec
[  4]  9.0-10.0 sec  14.8 MBytes   124 Mbits/sec
[  4] 10.0-11.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 11.0-12.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 12.0-13.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 13.0-14.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 14.0-15.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 15.0-16.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 16.0-17.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 17.0-18.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 18.0-19.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 19.0-20.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 20.0-21.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 21.0-22.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 22.0-23.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 23.0-24.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 24.0-25.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 25.0-26.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 26.0-27.0 sec  0.00 Bytes  0.00 bits/sec
[  4] 27.0-28.0 sec  0.00 Bytes  0.00 bits/sec
[  4]  0.0-28.9 sec   876 MBytes   255 Mbits/sec
networking  local-area-network  server-message-block  wireless-bridge 
— 史蒂芬
source
3
您有大量数据可以证明确实发生了此问题，但是没有任何数据可以揭示出发生此问题的原因。问题出现时，您是否从这些无线接口收集了流量转储？任何异常都会有潜在的帮助。在这些几乎中断的情况下，我也没有直接从AP本身看到任何数据。这将有助于确定两者之间是否存在某种信号衰减。也许一家造纸厂正在释放预定的屁气。
— 后台打印程序'18
1
天线之间是否有物理障碍？鸽子？
— Nikolai
并增加“物理影响”：天线是否有可能因风，振动等摆动而偏离所需的方向？此频率上是否还有其他发送者可能不时开启并引起干扰？可能需要记录吞吐量下降的时间，并将其与可能的影响相关联。
— dirkt

Answers:

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