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Packet Loss Test (Line Quality)
This takes care of the Security Scan, the Tweaks Test Applet and the East Coast Line Quality Test server.
Add sfo-monitor.dslreports.com - This is our San Francisco server.
Add sjc-monitor.dslreports.com - This is our San Jose server.
You should add those three domains to a "friendly" (local) zone with a lower protection rating.
Zone Alarm users click here for instructions.
Zone Alarm Pro users:
To become pingable, click Security > Customize (Internet side) > check off "Allow incoming ping (ICMP echo)." Click Apply then Ok. This will allow your machine to be totally pingable.
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You really will be queue-jumping, but not until whatever is being processed at that moment is completed.
If you're using a router, set it to allow pings. If you're using a firewall, the quickest way to become pingable is to tone down on the security level or just turn it off for the duration of the test. Some firewalls have an option to add IPs into a local or trusted zone that will give this IP more access than the general pool. These are the IP addresses that do the Monitor / Line Quality work.
Reason to be pingable:
This allows you to see if there are congestion problems, bottlenecks, bad routers and/or if something is wrong at your location. If you're not pingable, the only thing the test is useful for is a fancy traceroute.
There is an issue with your current network configuration.
Go back to the Desktop, right click on "Network Neighborhood" - "Properties." The Network Configuration window should pop up. In the white box, check for any duplicate TCP/IP or any duplicate hardware adapters. Leave only one and delete any extras. Reboot. You should run another Line Quality test to see if the problem persists. It shouldn't, but it's always good to check.
Another thing for Windows users to do is to have your NIC (ethernet card) installation disk handy, load into Windows Safe Mode, delete all the hardware adapters and start from scratch.
If you do not know how to enter into safe mode and make changes, just start a new topic asking for assistance in our Microsoft Help Forum.
1. Host LOSS - This indicates the percentage of packets dropped by that particular router.
2. Best - Lowest ping to the router
Avg. - Average ping to the router
Worst - Highest ping to the router
The lower the ping, the better.
3. Gateway - The second to the last hop is your gateway. The gateway is a node on a network that serves as a entrance for local users onto the ISPs network.
4. (YOUR ADDRESS) - This is your computer. A dropped packet (shows as 2% dropped) loss is very common with an ICMP stream.
- Make sure that your modem is at least 12 inches (roughly 30 centimeters) clear of anything that emits electromagnetic interference (such as a CRT monitor). Make sure that all cables are not physically damaged and are properly connected. Halogen lighting and light dimmers in proximity to the computer can also cause a problem.
- Ensure that your ethernet card is seated properly and that your drivers are up to date.
- Reset your modem. Unplug it for about a minute or two, then plug it back in and let it regain sync.
If none of the above correct the issue, it would be in your best interest to contact your ISP and have them do an inspection of the line itself.
Here's the technical definition for a Host Precedence Violation (under RFC-1812): "Sent by the first hop router to a host to indicate that a requested precedence is not permitted for the particular combination of source/destination host or network, upper layer protocol and source/destination port."
Keep in mind, this is just a reference; there is a much-easier-to-digest explanation.
Let's go back to your Test History page. Find a Line Quality test then open it. Go down and look at the "your first hop ping" row. Check your gateway's IP. Most likely, it is between 10.0.0.0 & 10.255.255.255, 172.16.0.0 & 172.31.255.255 or 192.168.0.0 & 192.168.255.255, correct?
Those three domain ranges are in something dubbed the "Private IP Network" domains. With the way the Internet works, your ISP has set up an "exclusive LAN." Your ISP has your gateway set up so that it is dedicated to only Internet traffic coming from you and going to you. The DSLreports servers are not recognized within your ISP's network, so your gateway doesn't respond to any packets being sent directly to it. Your first hop ping is then estimated. Nearly all of the time, it shows up as way higher than it really is.
Do you want to know what your first hop ping really is?
With your Windows PC, go to "Start" - "Run" - then type "ping -t Your Gateway's IP here."
With your Mac OS X PC, open Terminal and type "ping IP here."
Open the Network Utility and fill in the text box.
With your Linux PC, go to a shell, then type "ping Your Gateway's IP here."
Since the gateway recognizes you as a part of your ISP's "happy family," it will correctly respond to a ping and return accurate results.
If you really want to be added, we recommend beating your main switch with a herring.*
*Please be nice to routing equipment and the herring.
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However, if you are not seeing packet loss all the way to the final hop, this apparent packet loss may not be an issue.
Some providers are rate-limiting how often they respond with the TTL-exceeded ICMP packets used by traceroute and similar tools like the Packet Loss Test. This is done to prevent attacks against these routers, since responding to these packets requires much more CPU time than simply forwarding the packet does. If the router is set up to rate-limit, it will respond to a certain number of traceroute packets per second, and once that many have been received, it will stop responding to them for that second -- which will appear as packet loss. You are not losing any "real" traffic, assuming the final hop of your traceroute isn't showing any loss.