how-to block ads
|
|
4. Troubleshooting·I ran a tweak test and I see packet retransmissions, why?
·How do I test for packet loss?
·Why is my modem activity light constantly flashing (even if my pc is off)?
·How do I request a firmware update?
·I've upgraded firmware on my 3com sharkfin and the diagnostics page is gone.
·I'm Experiencing Packet Loss, What do I do?
| | | There seems to be an issue with packet transmissions when running the DSLR Tweak Test.
If your efficiency is over 75% or so, I wouldn't worry about it.
It appears as if the packet retransmissions are occurring somewhere out on the internet between your OOL connection and the DSLR tweak test. That is normal internet behavior and is not a problem with your connection.
As an alternate test, I'd suggest testing your connection here. If your efficiency is greater there, then I definitely wouldn't worry about it at all.
 feedback form
 feedback form
by Lex Luthor 
last modified: 2002-03-04 14:51:10 | | | Find out your default gateway by going to start-->run-->winipcfg (ipconfig for XP/2000/NT) and selecting your network card in the dropdown box.
If you have a router, the above process will only give you your router IP, instead you will need to go into your router configuration page and find your default gateway there.
Open up a dos box.
Let's say your default gateway is 24.188.240.1
Type ping 24.188.240.1 -t
Let the test run for a minute or two then hit ctrl-C to end.
If there is more than 2% packet loss, you probably have a serious problem that needs to be investigated.
If you do have packet loss, try to re-run the test a few times to see if it was just some sort of anomaly or if it's definitive.
feedback form
feedback form
by Lex Luthor
last modified: 2002-03-04 14:46:23 | | | Some flashing of the activity light, even when the computer is not in use, is completely normal. In most cases, this traffic consists of ARP broadcast packets. ARP, which stands for Address Resolution Protocol, is used by TCP/IP to translate IP addresses into their associated MAC addresses, a process which is required for network operation. (The DOCSIS and Ethernet hardware in devices like cable modems, digital cables boxes and the cable modem termination system use MAC addresses when transferring data)
On a few older modems, some additional flashing is caused by multicast packets. Although these are usually filtered out, some modems flash their activity light before the application of the filter.
Once one has established their machine is virus free and firewalled, there is no reason to be concerned about flashing of the activity light. The downstream has *plenty* of capacity to handle this traffic, so it should not cause any performance degradation.
---
Submitted by Bichon
feedback form
feedback form
by Lex Luthor
last modified: 2004-08-20 17:06:03 | | | OOL will "push" new firmware revisions out to your modem once they have tested the code and deem it "ready for public use".
If you don't have the newest firmware, but aren't having any problems, don't worry about it, you probably are best to leave well enough alone.
feedback form
feedback form
by Lex Luthor
last modified: 2005-09-27 22:34:07 | | | Visit JayKLM's web site for detailed instructions.
feedback form
feedback form
by Lex Luthor
last modified: 2002-09-03 17:22:27 | | | The first major cause of packet loss would be signal level trouble. Once your signals check out, packet loss is usually a network problem, not a problem inside the house. That said, it is required procedure by Cablevision that each trouble call be qualified with a check by a service tech prior to referral.
This step can be bypassed only if there is documented evidence of others with the same problem on the same node (multiple troubles reported to Cablevision Customer Service), or something else out of whack, such as Cablevision's Network Monitoring Systems reporting a high error count or bad signal to noise reading on the upstream at the CMTS.
There have been cases of packet loss (with otherwise good signals) caused by an intermittent connection at the tap, ground block, splitter, or other inside wiring. They want to eliminate these possibilities first. Also, the service tech can check signal levels, and also see if it's the modem itself that's causing the packet loss.
As a rule of thumb, the following procedure is recommended for anyone reporting packet loss:
1) Check signal levels /faq/1083. If any levels are out of spec /faq/1084, all bets are off for packet loss.
2) Document it. Run ping tests to the default gateway and note the results. See if it's a particular time of day, weather condition, etc. when it happens.
3) Contact Customer Service and request a ping test when the problem is happening. Let them schedule a service call preferably during a 'problem' time.
4) Have patience for the referral process to work.
For any cable operator, intermittent packet loss caused by intermittent noise or interference on the upstream plant is probably the most difficult problem to isolate and fix. It takes some time and considerable effort. Unfortunately, it's also something that the customer usually cannot do anything about themselves.
feedback form
feedback form
by Lex Luthor
last modified: 2005-09-27 22:33:17 |
|
