Thanks for the offers of assistance guys. I've posted the relevant bits of my post to the VM newsgroups below, including modem info and traceroute results.
Quote:
The symptoms I've noticed
are:
1. Occasional drop outs or pauses for a couple of seconds - usually I don't
have to do anything to rectify this, sometimes I need to reboot the modem
and the router. This isn't a problem when downloading however it does affect
applications like IM, VOIP and online gaming.
2. Previously I've always managed to sustain a nice steady download speed
from gamefiles.virginmedia.com and any other site that has sufficient
bandwidth however over the past couple of months download speeds have
fluctuated wildly. They seem to ramp up to 19.5mbps, stay there for a couple
of seconds and then drop down to only 2mbps or 3mbps. This cycle is
repeated.
3. Downstream power levels seem to be fluctuating more than before - my
downstream power level was 6.2dBmV last time I looked, it's now 4.3 dBmV
(which is still higher than it was previously).
Both of these problems occurred at around the same time I was assigned a
completely different IP address (starting with 9, rather than the usual 8. I
also noticed that this IP address change resulted in an increase in both my
upstream and downstream power levels (although I believe they are still
within acceptable limits...?). I've no idea whether this is pure coincidence
or not!
Neither of the problems is there all the time, however the fluctuating
download speeds is there more often than not. Interestingly the download
speeds are always nice and steady when my connection has been throttled by
STM.
Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 26
Downstream Frequency : 315000000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : 4.3 dBmV
Downstream SNR : 38.7 dB
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 3
Upstream Frequency : 37500000 Hz
Upstream Modulation : QAM16
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 43.0 dBmV
Upstream Mini-Slot Size : 2
1 <1 ms <1 ms <1 ms 192.168.1.1
2 28 ms 33 ms 50 ms 10.69.240.1
3 8 ms 27 ms 30 ms osr01smal-ge32.network.virginmedia.net [80.1.61.133]
4 17 ms 8 ms 16 ms osr01perr-tenge71.network.virginmedia.net [62.30.247.53]
5 47 ms 28 ms 34 ms perr-core-1a-ge-200-0.network.virginmedia.net [62.255.149.129]
6 20 ms 11 ms 21 ms manc-bb-1a-as1-0.network.virginmedia.net [213.105.175.181]
7 42 ms 92 ms 35 ms gfd-bb-b-ae1-0.network.virginmedia.net [213.105.175.146]
8 19 ms 63 ms 47 ms redb-ic-1-as0-0.network.virginmedia.net [62.253.185.78]
9 17 ms 44 ms 19 ms 212.58.239.249
10 20 ms 30 ms 37 ms 212.58.238.133
11 26 ms 19 ms 17 ms virtual-vip.thdo.bbc.co.uk [212.58.224.138]
Cable Modem Event Log
Sat Feb 27 02:41:42 2010 Sat Feb 27 02:41:42 2010 Warning (5) DHCP REBIND
WARNING - Field invalid in response
Fri Feb 26 20:59:46 2010 Fri Feb 26 20:59:46 2010 Critical (3) Started
Unicast Maintenance Ranging - No Response received - ...
Tue Feb 23 00:01:20 2010 Tue Feb 23 00:01:20 2010 Warning (5) DHCP REBIND
WARNING - Field invalid in response
Sun Feb 21 21:52:21 2010 Sun Feb 21 21:52:21 2010 Information (7)
Downstream sync ok
Sun Feb 21 21:52:21 2010 Sun Feb 21 21:52:21 2010 Information (7) locked
and synced to rescue CMTS...all is well!
Sun Feb 21 21:52:21 2010 Sun Feb 21 21:52:21 2010 Information (7)
Downstream sync ok
Sun Feb 21 21:52:20 2010 Sun Feb 21 21:52:20 2010 Critical (3) SYNC Timing
Synchronization failure - Loss of Sync
Sun Feb 21 21:52:20 2010 Sun Feb 21 21:52:20 2010 Information (7)
Downstream sync failed
Wed Feb 17 03:47:53 2010 Wed Feb 17 03:47:53 2010 Warning (5) DHCP REBIND
WARNING - Field invalid in response
Mon Feb 15 13:04:47 2010 Mon Feb 15 13:04:47 2010 Information (7)
Downstream sync ok
Mon Feb 15 13:04:47 2010 Mon Feb 15 13:04:47 2010 Information (7) locked
and synced to rescue CMTS...all is well!
Mon Feb 15 13:04:47 2010 Mon Feb 15 13:04:47 2010 Information (7)
Downstream sync ok
Mon Feb 15 13:04:47 2010 Mon Feb 15 13:04:47 2010 Critical (3) SYNC Timing
Synchronization failure - Loss of Sync
Mon Feb 15 13:04:47 2010 Mon Feb 15 13:04:47 2010 Information (7)
Downstream sync failed
Sat Feb 13 07:03:32 2010 Sat Feb 13 07:03:32 2010 Warning (5) DHCP REBIND
WARNING - Field invalid in response
Fri Feb 12 08:23:46 2010 Fri Feb 12 08:23:46 2010 Information (7)
Downstream sync ok
Fri Feb 12 08:23:46 2010 Fri Feb 12 08:23:46 2010 Information (7) locked
and synced to rescue CMTS...all is well!
Fri Feb 12 08:23:46 2010 Fri Feb 12 08:23:46 2010 Information (7)
Downstream sync ok
Fri Feb 12 08:23:46 2010 Fri Feb 12 08:23:46 2010 Critical (3) SYNC Timing
Synchronization failure - Loss of Sync
Fri Feb 12 08:23:46 2010 Fri Feb 12 08:23:46 2010 Information (7)
Downstream sync failed
Fri Feb 12 04:09:27 2010 Fri Feb 12 04:09:27 2010 Information (7)
Downstream sync ok
Fri Feb 12 04:09:27 2010 Fri Feb 12 04:09:27 2010 Information (7) locked
and synced to rescue CMTS...all is well!
Fri Feb 12 04:09:27 2010 Fri Feb 12 04:09:27 2010 Information (7)
Downstream sync ok
Fri Feb 12 04:09:26 2010 Fri Feb 12 04:09:26 2010 Critical (3) SYNC Timing
Synchronization failure - Loss of Sync
Fri Feb 12 04:09:26 2010 Fri Feb 12 04:09:26 2010 Information (7)
Downstream sync failed
Tue Feb 09 04:57:27 2010 Tue Feb 09 04:57:27 2010 Information (7)
Downstream sync ok
Tue Feb 09 04:57:27 2010 Tue Feb 09 04:57:27 2010 Information (7) locked
and synced to rescue CMTS...all is well!
Tue Feb 09 04:57:27 2010 Tue Feb 09 04:57:27 2010 Information (7)
Downstream sync ok
Tue Feb 09 04:57:27 2010 Tue Feb 09 04:57:27 2010 Critical (3) SYNC Timing
Synchronization failure - Loss of Sync
Tue Feb 09 04:57:27 2010 Tue Feb 09 04:57:27 2010 Information (7)
Downstream sync failed
Mon Feb 08 10:44:27 2010 Mon Feb 08 10:44:27 2010 Information (7)
Downstream sync ok
Mon Feb 08 10:44:27 2010 Mon Feb 08 10:44:27 2010 Information (7) locked
and synced to rescue CMTS...all is well!
|
There seems to be this sequence of events cropping up every couple of days...
Quote:
Information (7) Downstream sync ok
Information (7) locked and synced to rescue CMTS...all is well!
Information (7) Downstream sync ok
Critical (3) SYNC Timing Synchronization failure - Loss of Sync
Information (7) Downstream sync failed
|
Cheers,
Ed.