[Sephiroth]

Originally Posted by minichaz

Hi Sephiroth. Can you explain what you mean? I'm curious because that packet loss was 40% yesterday when things were bad and less than 2% this morning when things were working properly. Surely if my firewall was blocking the relevant ICMP packets I'd see 100% loss all the time? I'll keep an eye on it but it does appear directly related to the issue.
[SEPH]: The 10.xx address is the "you" side of the UBR/CMTS (a private IP address supplied to the cable modem by the CMTS) and every path ping will likely show some/all packets as discarded. The fact that you get through to the next node is proof that nothing is wrong due to node 2.

The more technical explanation is that your router or modem simply doesn't respond to some or all ICMP requests (i.e. it doesn't create ICMP TTL expired packets). It depends on what the cable modem or router is doing at the time. Or it's the router firewall rejecting pings (but then it'll be 100% all the time).

Surely the "me" side is my cable modem which has a different 10.*.*.* IP address. Isn't the CMTS the start of the VM side?
[SEPH]: Not really. The CMTS will have a 68.xx or 203.xx public (registered) IP address.

The CM must talk to the CMTS. The 10.xx private address is issued to the CM by the CMTS allowing the CM to communicate with the CMTS.

As I understand it the CMTS won't just be me but will be shared with many others. With students returning for their new term could this be congestion?
[SEPH]: That's a different matter. If there is no network issue (a very complex subject) then poor performance is usually down to congestion.

That can be cause by oversubscription, unbalanced CMTS connections, too many homes connected to the street box and/or those students who do their excessive thing.

Many thanks,
Charlie

Fair enough. It's a complex subject.