Random Line Drops

[ShadowXFX]

Hello all

Hope someone can help me cause this is driving me insane, randomly our line just disconnects then comes back on after a minute or so, does anyone know what the reason could be?

Telkom says they see no problem on their side.

On the router log this is what I see:

Jun 21 16:39:45 user alert kernel: Intrusion -> IN=ppp0.1 OUT= MAC= SRC=91.183.154.206 DST=41.132.221.143 LEN=48 TOS=0x18 PREC=0x00 TTL=109 ID=46862 DF PROTO=TCP SPT=1637 DPT=3389 WINDOW=65535 RES=0x00 SYN URGP=0 MARK=0x8000000
Jun 21 16:44:03 daemon crit syslog: Clear IP addresses. Connection DOWN.
Jun 21 16:44:03 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
Jun 21 16:44:10 user info kernel: device atm0.1 left promiscuous mode
Jun 21 16:44:10 user info kernel: device atm0 left promiscuous mode
Jun 21 16:44:10 user info kernel: br0: port 5(atm0.1) entering disabled state
Jun 21 16:44:12 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:44:39 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:45:06 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:45:33 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:45:59 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:46:26 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:46:53 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:47:19 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:47:32 user crit kernel: Line 0: ADSL link down
Jun 21 16:47:32 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = DOWN, Service Support = ATM
Jun 21 16:47:32 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
Jun 21 16:47:34 user crit kernel: Line 0: xDSL G.994 training
Jun 21 16:47:36 user crit kernel: Line 0: ADSL G.992 started
Jun 21 16:47:39 user crit kernel: Line 0: ADSL G.992 channel analysis
Jun 21 16:47:43 user crit kernel: Line 0: ADSL G.992 message exchange
Jun 21 16:47:43 user crit kernel: Line 0: ADSL link up, fast, us=512, ds=4096
Jun 21 16:47:43 user warn kernel: bcmxtmcfg: XTM Link Information, portid = 0, State = UP, Service Support = ATM
Jun 21 16:47:43 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=512000, DS=4096000
Jun 21 16:47:43 user warn kernel: bcmxtmcfg: Connection DOWN, LinkActiveStatus=0x0
Jun 21 16:47:44 user warn kernel: bcmxtmrt: MAC address: 84 c9 b2 d7 fa 1a
Jun 21 16:47:44 user warn kernel: [DoCreateDeviceReq.2367]: register_netdev
Jun 21 16:47:44 user warn kernel: [DoCreateDeviceReq.2369]: register_netdev done
Jun 21 16:47:44 user warn kernel: bcmxtmcfg: Connection UP, LinkActiveStatus=0x1, US=512000, DS=4096000
Jun 21 16:47:44 user warn kernel: BCMVLAN : atm0 mode was set to RG
Jun 21 16:47:44 user warn kernel: [ERROR vlan] bcmVlan_insertTagRule,1602: Invalid Number of Tags: 2 (max 2)
Jun 21 16:47:44 user warn kernel: [ERROR vlan] vlanIoctl ,530: Failed to Insert Tag Rule in atm0 (tags=2, dir=0)
Jun 21 16:47:44 daemon notice syslog: pppd 2.4.1 started by admin, uid 0
Jun 21 16:47:44 user info kernel: device atm0.1 entered promiscuous mode
Jun 21 16:47:44 user info kernel: device atm0 entered promiscuous mode
Jun 21 16:47:44 user info kernel: br0: port 5(atm0.1) entering forwarding state
Jun 21 16:47:45 daemon notice syslog: PPP: Start to connect ...
Jun 21 16:47:48 daemon crit syslog: PPP server detected.
Jun 21 16:47:48 daemon crit syslog: PPP session established.
Jun 21 16:47:48 user warn kernel: wp1=3c wp2=00
Jun 21 16:47:48 user warn kernel: e127wp1=00 wp2=3c
Jun 21 16:47:48 daemon crit syslog: PPP LCP UP.
Jun 21 16:47:49 daemon crit syslog: Received valid IP address from server. Connection UP.

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (dB): 106 120
Attenuation (dB): 500 305
Output Power (dBm): 195 91
Attainable Rate (Kbps): 5440 888
Rate (Kbps): 4096 512
D (interleaver depth): 1 1
Delay (msec): 0.13 0.25

Sorry for long post.

 

[werny]

According to this website = http://www.kitz.co.uk/adsl/max_speed_calc.php your attenuation of 50db isn't the problem and 4Mbps will be stable, you are about 3.6km's from the exchange. Also look at this graph, it will show you the distance from the exchange and the max speed you can get with your line stats:

However, your SNR is very low, with 10.6db it is going to disconnect from time to time, there is noise on the line.

SNR values:

* 6bB. or below = Bad and will experience no line synchronisation and frequent disconnections
* 7dB-10dB. = Fair but does not leave much room for variances in conditions.
* 11dB-20dB. = Good with little or no disconnection problems
* 20dB-28dB. = Excellent
* 29dB. or above = Outstanding

 

[OMB]

I had the same problem until about a month ago, after nearly 2 months of having the fault I finally had a total disconnection, so they had to send a tech, he changed the port at the exchange and since then I've been rock solid stable.

 

[ShadowXFX]

Thanks for the replies, I will ask them to go put me on a different port at the exchange.

 

[ShadowXFX]

Well hopefully it fixed now, last week a Telkom member came out to check the line and said there were no problems whatsoever yet today a different guy comes out and says immediately there is a problem and goes and fixes the line, apparently there was a breakage somewhere.

 

[ShadowXFX]

Sigh and there it drops again