A Technical question about Cable Modems and MTU

[Bob Impact]

I'm not entirely sure if anyone will be able to help out with this but here goes nothing...

I recently got Comcast High Speed Internet (Cable Modem behind a LinksysBEFW11S4 router, I am hardwired to the router, two other machines are wireless) and I'm having problems with my connection. First of all, it's MAXING at just under 1MB/S, I can't get any streaming content to stay running for longer than 5 minutes, Large file downloads eventually hang up, and some webpages appear blank until I reload them several times. I have attempted to remedy this using dslreports.com's Tweak Test and Dr. TCP. The one bug I have noticed over and over is that my MTU is reliably at 576. Setting the router and machine to 1500 has changed nothing, although the other machines on the router are getting 1500 MTU constantly. All other means of connection are disabled (56K modems and such). I recently purchased and installed a coax cable amp, and my connection speed has risen somewhat, but I still have the same Dr0pped streams problem. If anyone can help please do so here, or IM me at tdwidth.

Thanks.

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Thanks, FlufferNutter and CZM.

[FollowThisLogic]

It may help to know, I'm pretty sure Comcast caps your bandwidth at 128kbps upstream, 1Mbps downstream.

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[ToddEVF]

if i am correct, FTL is correct.

However all cable high speed internet access is capped at a certain point.

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[Bob Impact]

Capping the speed or not, I would be more interested to know if they set the MTU at 576 and cap it. I also would doubt Comcast is capping at 1MB/S as they advertise the speed at 1.5.

<center><img src="http://czm.racknine.net/images/bobimpactfog.gif"><br>
Thanks, FlufferNutter and CZM.