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我的ADSL路由器不断断开连接，如何诊断？

AJPerez 发表于 Dev
40
AJPerez

我的ADSL路由器（有10年历史的Comtrend AR-5381u）每隔几分钟就会不断与Internet断开连接。像这样3-4天了；奇怪的是，它只发生在晚上。

我曾尝试从软件管理控制台重新启动路由器（这无济于事），然后将其物理上关闭然后再打开（在前几天，它解决了问题……今天没有了）。

我启用了WiFi（WPA2-PSK + AES和MAC过滤）。不知道这是否足够安全，但是无论如何，我正在检查“经过WiFi身份验证的设备”，并且显示的唯一一个是我自己的手机，因此这并不是一个无聊的邻居弄乱了我的WiFi。

另外，我没有运行任何P2P软件，也没有进行任何可能破坏Internet的工作。只需几个即可在Google Chrome浏览器中打开标签页，并在手机中打开一些后台应用程序。有时候我只是在电视上看Netflix或Youtube，根本没有电脑。

我该怎么做（如果有的话）来解决或至少诊断出问题？

我什至不知道这是我的路由器，ISP还是断开我的连接的人（DDoS？这不像我是Microsoft，而是我的家……）。

这是自上次（物理）重新引导以来的系统日志。有很多“内核入侵”，但是从我读到的内容来看，我不必担心它们，它们只是尝试从Internet访问我的路由器（不是吗？）。

Jan 1 00:00:08  syslog  emerg   BCM96345 started: BusyBox v1.00 (2011.10.28-05:10+0000)
Jan 1 00:00:24  user    crit    kernel: Line 0: xDSL G.994 training
Jan 1 00:00:24  user    crit    kernel: eth0 Link UP 100 mbps full duplex
Jan 1 00:00:37  user    crit    kernel: Line 0: ADSL G.992 started
Jan 1 00:00:41  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Jan 1 00:00:45  user    crit    kernel: Line 0: ADSL G.992 message exchange
Jan 1 00:00:46  user    crit    kernel: Line 0: ADSL link down
Jan 1 00:00:47  user    crit    kernel: Line 0: xDSL G.994 training
Jan 1 00:01:00  user    crit    kernel: Line 0: ADSL G.992 started
Jan 1 00:01:04  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Jan 1 00:01:08  user    crit    kernel: Line 0: ADSL G.992 message exchange
Jan 1 00:01:10  user    crit    kernel: Line 0: ADSL link up, Bearer 0, us=842, ds=16590
Jan 1 00:01:34  daemon  crit    syslog: PPP server detected.
Jan 1 00:01:34  daemon  crit    syslog: PPP session established.
Jan 1 00:01:40  daemon  crit    syslog: PPP LCP UP.
Jan 1 00:03:22  daemon  crit    syslog: PPP server detected.
Jan 1 00:03:23  daemon  crit    syslog: PPP session established.
Jan 1 00:03:26  daemon  crit    syslog: PPP LCP UP.
Jan 1 00:03:26  daemon  crit    syslog: Received valid IP address from server. Connection UP.
Apr 7 20:30:00  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=77.72.82.94 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=20107 PROTO=TCP SPT=41720 DPT=8859 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:30:00  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=46.161.55.108 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=19005 PROTO=TCP SPT=43447 DPT=2443 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:30:01  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=5.188.11.37 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=38893 PROTO=TCP SPT=55797 DPT=5389 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:30:29  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=59.38.100.155 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=61313 PROTO=TCP SPT=58121 DPT=1433 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:30:45  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=223.100.148.74 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=233 ID=33541 PROTO=TCP SPT=45265 DPT=1433 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:40:01  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=50.2.190.138 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=8313 DF PROTO=TCP SPT=18013 DPT=1250 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 20:50:07  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.216.140.16 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=23593 DF PROTO=TCP SPT=32210 DPT=3308 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:00:03  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=211.152.60.146 DST=95.16.160.53 LEN=40 TOS=0x00 PREC=0x00 TTL=110 ID=256 PROTO=TCP SPT=49268 DPT=445 WINDOW=16384 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:02:01  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:02:01  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:02:01  daemon  crit    syslog: Clear IP addresses. PPP connection DOWN.
Apr 7 21:02:01  daemon  crit    syslog: Clear IP addresses. Connection DOWN.
Apr 7 21:02:13  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:02:17  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:02:21  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:02:22  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:02:23  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:02:36  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:02:40  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:02:44  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:02:45  user    crit    kernel: Line 0: ADSL link up, Bearer 0, us=888, ds=17075
Apr 7 21:03:12  daemon  crit    syslog: PPP server detected.
Apr 7 21:03:12  daemon  crit    syslog: PPP session established.
Apr 7 21:03:15  daemon  crit    syslog: PPP LCP UP.
Apr 7 21:03:17  daemon  crit    syslog: Received valid IP address from server. Connection UP.
Apr 7 21:03:28  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.216.140.16 DST=95.16.58.57 LEN=40 TOS=0x00 PREC=0x00 TTL=242 ID=29519 DF PROTO=TCP SPT=17817 DPT=3729 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:04:07  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=5.188.11.37 DST=95.16.58.57 LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=44709 PROTO=TCP SPT=55797 DPT=3382 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:04:21  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:04:21  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:04:21  daemon  crit    syslog: Clear IP addresses. PPP connection DOWN.
Apr 7 21:04:21  daemon  crit    syslog: Clear IP addresses. Connection DOWN.
Apr 7 21:04:33  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:04:37  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:04:42  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:04:43  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:04:44  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:04:56  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:05:00  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:05:05  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:05:06  user    crit    kernel: Line 0: ADSL link up, Bearer 0, us=888, ds=16380
Apr 7 21:05:30  daemon  crit    syslog: PPP server detected.
Apr 7 21:05:30  daemon  crit    syslog: PPP session established.
Apr 7 21:05:33  daemon  crit    syslog: PPP LCP UP.
Apr 7 21:05:34  daemon  crit    syslog: Received valid IP address from server. Connection UP.
Apr 7 21:06:08  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=109.248.9.18 DST=87.218.25.144 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=38071 PROTO=TCP SPT=50193 DPT=51391 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:06:36  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.216.140.16 DST=87.218.25.144 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=50787 DF PROTO=TCP SPT=50400 DPT=4509 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:06:45  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=139.162.115.7 DST=87.218.25.144 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=54321 PROTO=TCP SPT=58362 DPT=110 WINDOW=65535 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:06:58  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.130.212.2 DST=87.218.25.144 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=56833 DF PROTO=TCP SPT=2 DPT=8034 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:07:18  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:07:18  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:07:19  daemon  crit    syslog: Clear IP addresses. PPP connection DOWN.
Apr 7 21:07:19  daemon  crit    syslog: Clear IP addresses. Connection DOWN.
Apr 7 21:07:30  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:07:34  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:07:39  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:07:40  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:07:41  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:07:53  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:07:57  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:08:02  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:08:03  user    crit    kernel: Line 0: ADSL link up, Bearer 0, us=888, ds=16847
Apr 7 21:08:27  daemon  crit    syslog: PPP server detected.
Apr 7 21:08:27  daemon  crit    syslog: PPP session established.
Apr 7 21:08:30  daemon  crit    syslog: PPP LCP UP.
Apr 7 21:08:31  daemon  crit    syslog: Received valid IP address from server. Connection UP.
Apr 7 21:09:07  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.222.211.90 DST=87.218.24.53 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=3613 PROTO=TCP SPT=53518 DPT=33392 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:09:15  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.216.140.16 DST=87.218.24.53 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=11129 DF PROTO=TCP SPT=6335 DPT=4869 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:09:27  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=181.214.87.248 DST=87.218.24.53 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=33982 PROTO=TCP SPT=46326 DPT=3389 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:09:39  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:09:39  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:09:39  daemon  crit    syslog: Clear IP addresses. PPP connection DOWN.
Apr 7 21:09:39  daemon  crit    syslog: Clear IP addresses. Connection DOWN.
Apr 7 21:09:51  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:09:55  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:10:00  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:10:01  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:10:02  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:10:14  user    crit    kernel: Line 0: ADSL G.992 started
Apr 7 21:10:18  user    crit    kernel: Line 0: ADSL G.992 channel analysis
Apr 7 21:10:23  user    crit    kernel: Line 0: ADSL G.992 message exchange
Apr 7 21:10:24  user    crit    kernel: Line 0: ADSL link up, Bearer 0, us=888, ds=16953
Apr 7 21:10:48  daemon  crit    syslog: PPP server detected.
Apr 7 21:11:18  daemon  crit    syslog: PPP session established.
Apr 7 21:11:21  daemon  crit    syslog: PPP LCP UP.
Apr 7 21:11:22  daemon  crit    syslog: Received valid IP address from server. Connection UP.
Apr 7 21:11:51  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=77.72.82.103 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=20005 PROTO=TCP SPT=54206 DPT=49 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:12:09  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=185.216.140.16 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=37390 DF PROTO=TCP SPT=18182 DPT=4929 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:12:41  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=141.105.71.116 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=55831 DF PROTO=TCP SPT=12970 DPT=8091 WINDOW=512 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:12:44  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=189.211.6.43 DST=95.16.175.33 LEN=52 TOS=0x00 PREC=0x00 TTL=114 ID=27155 DF PROTO=TCP SPT=61195 DPT=445 WINDOW=8192 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:12:52  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=5.101.2.205 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=38539 PROTO=TCP SPT=47669 DPT=3426 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:13:37  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=5.188.11.43 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=23727 PROTO=TCP SPT=47504 DPT=4049 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:13:42  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=77.72.82.88 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=6796 PROTO=TCP SPT=59153 DPT=3222 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:13:44  user    alert   kernel: Intrusion -> IN=ppp0 OUT= MAC= SRC=93.174.93.218 DST=95.16.175.33 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=22819 PROTO=TCP SPT=46685 DPT=20183 WINDOW=1024 RES=0x00 SYN URGP=0 MARK=0x8000000
Apr 7 21:13:59  user    crit    kernel: Line 0: ADSL link down
Apr 7 21:13:59  user    crit    kernel: Line 0: xDSL G.994 training
Apr 7 21:13:59  daemon  crit    syslog: Clear IP addresses. PPP connection DOWN.
Apr 7 21:13:59  daemon  crit    syslog: Clear IP addresses. Connection DOWN.
Apr 7 21:14:11  user    crit    kernel: Line 0: ADSL G.992 started

似乎每次出现几次“刺耳”之后，这条线就下降了。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。因此，也许是某种形式的攻击导致了它的瘫痪，或者至少使路由器没有响应，从而失去了连接。我能以某种方式保护它吗？

更新：

我拔下所有电话的电源，然后将路由器直接连接到墙上的插座。虽然略有改善，但仍然保持断开状态。

路由器统计数据显示，每当连接上升然后下降时，SNR容限约为9dB。有时它保持在8或7，有时会下降到5、4、3dB ...我所看到的最低值为1.9。有时它会恢复到7，而其他时候连接会丢失。下游和上游都像这样波动，但下游通常较低。我的连接是“下载速度最高可达20Mbps，上传速度最高可达1Mbps”，因此我猜上游并不“拥挤”。

我注意到的另一件事是，我有疯狂的HEC错误，主要是下游。每15秒产生5000个新错误。那是生产线实际启动并工作的时候...

这是当前统计页面的屏幕截图。自上次重新启动8小时前以来，有180万个HEC错误...

在此处输入图片说明

AJPerez

As most of the comments said, it was a problem on the line. Or it must have been, because it's solved now and I didn't change anything :). I was waiting until monday to call my ISP's customer service, but apparently they fixed the issue that same monday. The Internet connection hasn't dropped since then, and it's been 4 days already.

The SNR (signal-to-noise ratio) margin is much much better and stable now: 12-14 dB downstream and 9 dB upstream, anything over 6dB is good enough, so no problems there.

I still have HEC errors1 2, but now they're in the order of 5.000 per hour, instead of 225.000.

至于“内核入侵”警报，它们仍会不时出现在路由器的日志中，但是该线路一直在工作，因此很明显，这不是问题所在。也许他们没有帮助，因为路由器已经在极度嘈杂的线路中苦苦挣扎。

更新：只是进行后续操作以确认它实际上是该行。问题再次开始，并且在几次致电我的ISP之后，他们给我发送了一个全新的路由器...即使我直接将其直接插入“网络终端”测试端口而不是常规端口，该连接仍会丢失电话插头。实际上，它所处理的噪音甚至比我的老式路由器还要差。是时候数字化了，用光纤代替了DSL。

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。

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