Basic Internet Connectivity And Modem Help
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Note: this is not comcast defending the issue this straight from dslreports faqs and has no reason to defend comcast.. In other words.. Just the faqs 
and I quote:
Q: Why am I seeing so much packet loss in my provider's network? (#14068)
A: If you are also seeing packet loss from these points all the way to the final hop of your test, that points to a problem on the device first showing packet loss, or on the inbound connection to that device.
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 ratelimit, 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 appears as packet loss. You are not losing any "real" traffic, assuming the final hop of your traceroute isn't showing any loss.
