最近我与 ISP 之间的连接出现了严重的问题。
我的 D-Link 2750U 路由器报告以下衰减：
+------------------+------------+-----------+
| Attenuation (dB) | Downstream | Upstream |
+------------------+------------+-----------+
| | 365 | 183 |
+------------------+------------+-----------+
我的 ISP 说这是错误的，我的线路上的衰减约为 18dB（我距离互联网交换机有 27 公里，这意味着衰减约为 37.5dB，或者我是这么认为的）。
以下是过去一小时我的路由器上的日志记录：
May 24 17:27:44 user crit kernel: Line 0: ADSL link down
May 24 17:27:44 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = DOWN, Service Support = ATM
May 24 17:27:44 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
May 24 17:27:45 user crit kernel: Line 0: xDSL G.994 training
May 24 17:27:55 user crit kernel: Line 0: ADSL G.992 started
May 24 17:27:59 user crit kernel: Line 0: ADSL G.992 channel analysis
May 24 17:28:04 user crit kernel: Line 0: ADSL link down
May 24 17:28:05 user info kernel: device atm0.1 left promiscuous mode
May 24 17:28:05 user info kernel: device atm0 left promiscuous mode
May 24 17:28:05 user info kernel: br0: port 6(atm0.1) entering disabled state
May 24 17:28:06 daemon crit syslog: Clear IP addresses. Connection DOWN.
May 24 17:28:06 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
May 24 17:28:10 user crit kernel: Line 0: xDSL G.994 training
May 24 17:28:19 user crit kernel: Line 0: ADSL G.992 started
May 24 17:28:24 user crit kernel: Line 0: ADSL G.992 channel analysis
May 24 17:28:28 user crit kernel: Line 0: ADSL G.992 message exchange
May 24 17:28:29 user crit kernel: Line 0: ADSL link up, Bearer 0, us=507, ds=4096
May 24 17:28:29 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = UP, Service Support = ATM
May 24 17:28:29 user warn kernel: bcmxtmrt: MAC address: cc b2 55 45 e5 c4
May 24 17:28:29 user warn kernel: [DoCreateDeviceReq.2367]: register_netdev
May 24 17:28:29 user warn kernel: [DoCreateDeviceReq.2369]: register_netdev done
May 24 17:28:29 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=507000, DS=4096000
May 24 17:28:29 user warn kernel: BCMVLAN : atm0 mode was set to RG
May 24 17:28:29 user warn kernel: [ERROR vlan] bcmVlan_insertTagRule,1602: Invalid Number of Tags: 2 (max 2)
May 24 17:28:29 user warn kernel: [ERROR vlan] vlanIoctl ,530: Failed to Insert Tag Rule in atm0 (tags=2, dir=0)
May 24 17:28:29 user info kernel: device atm0.1 entered promiscuous mode
May 24 17:28:29 user info kernel: device atm0 entered promiscuous mode
May 24 17:28:29 daemon notice syslog: pppd 2.4.1 started by admin, uid 0
May 24 17:28:29 user info kernel: br0: port 6(atm0.1) entering forwarding state
May 24 17:28:30 daemon notice syslog: PPP: Start to connect ...
May 24 17:28:56 daemon notice syslog: PPP: Start to connect ...
May 24 17:28:57 daemon crit syslog: PPP server detected.
May 24 17:28:57 daemon crit syslog: PPP session established.
May 24 17:28:58 user warn kernel: wp1=3c wp2=00
May 24 17:28:58 user warn kernel: e126wp1=00 wp2=3c
May 24 17:28:58 daemon crit syslog: PPP LCP UP.
May 24 17:28:59 daemon crit syslog: Received valid IP address from server. Connection UP.
May 24 17:29:15 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=64.94.18.71 DST=105.228.182.104 LEN=52 TOS=0x10 PREC=0x00 TTL=111 ID=16934 DF PROTO=TCP SPT=61017 DPT=64481 WINDOW=8192 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:29:18 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=195.59.54.103 DST=105.228.182.104 LEN=60 TOS=0x10 PREC=0x00 TTL=55 ID=2661 DF PROTO=TCP SPT=62203 DPT=64446 WINDOW=14600 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:29:19 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=195.59.54.103 DST=105.228.182.104 LEN=60 TOS=0x10 PREC=0x00 TTL=55 ID=2662 DF PROTO=TCP SPT=62203 DPT=64446 WINDOW=14600 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:29:21 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=195.59.54.103 DST=105.228.182.104 LEN=60 TOS=0x10 PREC=0x00 TTL=55 ID=2663 DF PROTO=TCP SPT=62203 DPT=64446 WINDOW=14600 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:37:31 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=87.109.102.146 DST=105.228.182.104 LEN=60 TOS=0x10 PREC=0x00 TTL=42 ID=49921 DF PROTO=TCP SPT=1449 DPT=80 WINDOW=5840 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:39:24 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=213.114.250.165 DST=105.228.182.104 LEN=52 TOS=0x10 PREC=0x00 TTL=108 ID=29039 DF PROTO=TCP SPT=58156 DPT=80 WINDOW=8192 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:52:27 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=27.254.41.97 DST=105.228.182.104 LEN=48 TOS=0x10 PREC=0x00 TTL=113 ID=24755 DF PROTO=TCP SPT=4123 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0 MARK=0x8000000
May 24 17:56:33 user crit kernel: Line 0: ADSL link down
May 24 17:56:33 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = DOWN, Service Support = ATM
May 24 17:56:33 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
May 24 17:56:35 user crit kernel: Line 0: xDSL G.994 training
May 24 17:56:44 user crit kernel: Line 0: ADSL G.992 started
May 24 17:56:48 user info kernel: device atm0.1 left promiscuous mode
May 24 17:56:48 user info kernel: device atm0 left promiscuous mode
May 24 17:56:48 user info kernel: br0: port 6(atm0.1) entering disabled state
May 24 17:56:49 daemon crit syslog: Clear IP addresses. Connection DOWN.
May 24 17:56:49 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
May 24 17:56:49 user crit kernel: Line 0: ADSL G.992 channel analysis
May 24 17:56:53 user crit kernel: Line 0: ADSL G.992 message exchange
May 24 17:56:53 user crit kernel: Line 0: ADSL link up, Bearer 0, us=1087, ds=4160
May 24 17:56:53 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = UP, Service Support = ATM
May 24 17:56:53 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=1087000, DS=4160000
May 24 17:56:56 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
May 24 17:56:56 user warn kernel: bcmxtmrt: MAC address: cc b2 55 45 e5 c4
May 24 17:56:56 user warn kernel: [DoCreateDeviceReq.2367]: register_netdev
May 24 17:56:56 user warn kernel: [DoCreateDeviceReq.2369]: register_netdev done
May 24 17:56:56 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=1087000, DS=4160000
May 24 17:56:56 user warn kernel: BCMVLAN : atm0 mode was set to RG
May 24 17:56:56 user warn kernel: [ERROR vlan] bcmVlan_insertTagRule,1602: Invalid Number of Tags: 2 (max 2)
May 24 17:56:56 user warn kernel: [ERROR vlan] vlanIoctl ,530: Failed to Insert Tag Rule in atm0 (tags=2, dir=0)
May 24 17:56:57 daemon notice syslog: pppd 2.4.1 started by admin, uid 0
May 24 17:56:57 user info kernel: device atm0.1 entered promiscuous mode
May 24 17:56:57 user info kernel: device atm0 entered promiscuous mode
May 24 17:56:57 user info kernel: br0: port 6(atm0.1) entering forwarding state
May 24 17:56:57 daemon notice syslog: PPP: Start to connect ...
May 24 17:57:03 user crit kernel: Line 0: ADSL link down
May 24 17:57:03 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = DOWN, Service Support = ATM
May 24 17:57:03 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
May 24 17:57:05 user crit kernel: Line 0: xDSL G.994 training
May 24 17:57:06 user info kernel: device atm0.1 left promiscuous mode
May 24 17:57:06 user info kernel: device atm0 left promiscuous mode
May 24 17:57:06 user info kernel: br0: port 6(atm0.1) entering disabled state
May 24 17:57:14 user crit kernel: Line 0: ADSL G.992 started
May 24 17:57:19 user crit kernel: Line 0: ADSL G.992 channel analysis
May 24 17:57:23 user crit kernel: Line 0: ADSL G.992 message exchange
May 24 17:57:23 user crit kernel: Line 0: ADSL link up, Bearer 0, us=507, ds=4096
May 24 17:57:23 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = UP, Service Support = ATM
May 24 17:57:24 user warn kernel: bcmxtmrt: MAC address: cc b2 55 45 e5 c4
May 24 17:57:24 user warn kernel: [DoCreateDeviceReq.2367]: register_netdev
May 24 17:57:24 user warn kernel: [DoCreateDeviceReq.2369]: register_netdev done
May 24 17:57:24 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=507000, DS=4096000
May 24 17:57:24 user warn kernel: BCMVLAN : atm0 mode was set to RG
May 24 17:57:24 user warn kernel: [ERROR vlan] bcmVlan_insertTagRule,1602: Invalid Number of Tags: 2 (max 2)
May 24 17:57:24 user warn kernel: [ERROR vlan] vlanIoctl ,530: Failed to Insert Tag Rule in atm0 (tags=2, dir=0)
May 24 17:57:24 user info kernel: device atm0.1 entered promiscuous mode
May 24 17:57:24 user info kernel: device atm0 entered promiscuous mode
May 24 17:57:24 daemon notice syslog: pppd 2.4.1 started by admin, uid 0
May 24 17:57:24 user info kernel: br0: port 6(atm0.1) entering forwarding state
May 24 17:57:24 daemon notice syslog: PPP: Start to connect ...
May 24 17:57:51 daemon notice syslog: PPP: Start to connect ...
May 24 17:57:54 daemon crit syslog: PPP server detected.
May 24 17:57:54 daemon crit syslog: PPP session established.
May 24 17:57:54 user warn kernel: wp1=3c wp2=00
May 24 17:57:54 user warn kernel: e126wp1=00 wp2=3c
May 24 17:57:54 daemon crit syslog: PPP LCP UP.
May 24 17:57:55 daemon crit syslog: Received valid IP address from server. Connection UP.
谁能告诉我为什么连接经常断开？我不太清楚如何解释这里的信息...