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foddy · 02-05-2011, 09:35

Occasionally, I have a problem where I lose Internet connection completely. Everything looks like it's working, my router has its IP address, I can see the 192.168.100.1 web site, but nothing beyond it.

Shutting down and bringing up the external interface forces things to work again (it probably causes the DHCP lease to be renewed). But it's the same IP address. Does the cable modem (VMNG300) maintain some sort of connection state that it's losing?

There were a few errors in the CM log at around the same time over a period of around a minute:

SYNC Timing Synchronization failure - Loss of Sync
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
No Ranging Response received - T3 time-out
MIMO Event MIMO: Stored MIMO=0 post cfg file MIMO=-1;

Any ideas?

Thanks.

---------- Post added at 10:35 ---------- Previous post was at 10:08 ----------

I should add - 64QAM, 7.04-8.17 dBmV downstream power levels, 16QAM 46.96 dBmV upstream.

I have a 3.5dB forward-path attenuator, a two-way splitter and a 8dB forward-path equaliser between VM and the cable modem (in that order, the equaliser being plugged into the modem).

02-05-2011, 09:35	#1
foddy Inactive Join Date: May 2004 Location: St Albans Services: Tivo, 50Mbps Posts: 134	Connection loss Occasionally, I have a problem where I lose Internet connection completely. Everything looks like it's working, my router has its IP address, I can see the 192.168.100.1 web site, but nothing beyond it. Shutting down and bringing up the external interface forces things to work again (it probably causes the DHCP lease to be renewed). But it's the same IP address. Does the cable modem (VMNG300) maintain some sort of connection state that it's losing? There were a few errors in the CM log at around the same time over a period of around a minute: SYNC Timing Synchronization failure - Loss of Sync Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out No Ranging Response received - T3 time-out MIMO Event MIMO: Stored MIMO=0 post cfg file MIMO=-1; Any ideas? Thanks. ---------- Post added at 10:35 ---------- Previous post was at 10:08 ---------- I should add - 64QAM, 7.04-8.17 dBmV downstream power levels, 16QAM 46.96 dBmV upstream. I have a 3.5dB forward-path attenuator, a two-way splitter and a 8dB forward-path equaliser between VM and the cable modem (in that order, the equaliser being plugged into the modem).