Re: Comcast problems again

Carey,

Comcast is not breaking your connection due to detecting multiple PCs
behind your NAT device.  Ask all you want about how NAT works and how to
hide the fact you have devices behind the NAT router just do it so you
can learn about these things.  It won't fix the issues you are having.
Period.

If you really want to find the issue and resolve the issues troubleshoot
it systematically.  Start by locating the bottleneck.

1. Walk down the stack and make sure the issue is an IP one and not
higher up (poorly performing DNS can slow things down a ton and make it
look like it's a network throttling / congestion issue.

2. Localize the problem.  Do a traceroute to say google then do 1000
byte pings to each hop along the way to see where the time starts
increasing by larger increments.  This is where it is saturated / being
throttled. Also, test throughput to a test node outside the firewall on
the comcast segment WHEN you are getting a slowdown.  If it slows down
to the test node at the same time the issue is in your internal network.

Hopefully this helps you solve the issue,

On Thu, 2011-05-26 at 21:57 -0500, Carey Tyler Schug wrote:

> It still doesn't explain how the web side of NAT looks different 
> compared to a single computer so Comcast can break it, and if there is 
> some way to tweak NAT so Comcast won't break it.  Like force NAT to use 
> a smaller range of translated port numbers?
> 
> --Carey

-- 
Trev Peterson
Advanced Reality
Email: [email protected]
Phone: +1 847 406 9018

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