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Trying to diagnose cable problem

T

twentworth

Member
I'm trying to figure out a connection problem I'm having with my cable modem (Road Runner) at home. I'm using pingplotter to graph my connection to one of Road Runner's routers (6 hops away), and as suspected, it's showing nearly complete loss of connection at random times - usually once every few minutes, sometimes more frequently.

I also use Road Runner at work, and I have used pingplotter to graph the work connection to the same router at the same time, and it does not show any of the connection loss I get at home.

My initial question is this: when I get the drop-out, it appears to originate from the very first address, which is an address that begins 10.48.x.x. I thought that these types of addresses were for "internal" use only. What is this address, and what might a complete drop-out from that address mean?

Thanks for any help.
 
The 10. address is just their internal network. Pretty normal.

But a complete loss of pings means something is seriously wrong. I'd call your provider and tell them of your troubles.

Does it always happen at this one router? If so then i'd start looking at the card in the router or the cable and start some debugging.
 
Yes, it appears to happen at the same router, 10.49.64.X. I just did another test - this time I ran pingplotter on my home computer pinging 10.49.64.x and simultaneously ran pingplotter on my work computer pinging same address. That address is the first hop at home, the fourth hop from work.

In a matter of 10 minutes, I had 24 drop-outs from home, but only 1 from work.

This is confusing. If that particular router is bad, then shouldn't I get the same results pinging from home or from work? Does this maybe point to something in the line between my house and the first hop? I've pinged my home (Linksys) router, and it has no problems.

Any ideas?
 
I would guess that you are dealing with some type of a RF issue. Generally the first hop in a trace on a Cable modem sytstem is to the CMTS. If you are getting loss on that hop it is a problem between your modem and the cable co's headend.

What type of mode do you have? We might be able to do some more diagnosis........
 
If I remember correctly most toshiba modems do not have an interal page for diagnosis. Call the cable co's support desk. Do what they ask (please be patient - most are required to walk thru certain steps, even if they are very basic) and they will most likely issue a Trouble Call for a tech to come by and verify signal strenght, etc.
 
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