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NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
reply to deepwoods

Re: [Speed] new "Performance Promo" is mostly unusable

Have you checked your Juniper firewall QoS settings?

After I migrated to Comcast from dual 3 mbps DSL circuits going through a Cisco dual WAN router, I also initially saw really crappy performance.

I checked and double checked my router/firewall settings, and everything looked as is should. I had previously setup QoS to optimize my slower DSL connections for VoiP, and after I changed the WAN settings from dual WAN PPPoE to a single WAN with DMZ for the new Comcast connection, those old QoS settings had seemingly been deleted. However, even though I could no longer see those old QoS config settings, they were still being used by the router. It took a factory default reset of the router, and manual reentry of all of my firewall rules to get proper performance with the new Comcast connection.
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.

deepwoods

join:2011-07-07
Berkeley, CA
Thanks - that's a reasonable reply.

Problem is, the bad performance is clearly associated with time of day. At times it runs at wire speed (20 down and 10 or so up). But "waking hours" and ALL weekend it is essentially unusable. And, that's with one person OR three people. None is doing anything but page loads.

Were there an issue with QOS (which I do not set) it would be constant.

This is up the pipe, and either a misconfiguration or - as i suspect - over provisioned. I am happy to retract the latter when it gets resolved.


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
An overcrowded node (and here I am using the network engineer's generic definition of node, not Comcast's limited and redefined definition for a fiber-coax media converter), can happen with any shared network. An extremely overcrowded access concentrator was one of the reasons I dropped AT&T DSL.

What you are seeing used to be quite common on Comcast. But for the most part it has been fixed by their DOCSIS 3 upgrades (which is not to say that some areas might not still have that problem). You might try to get Comcast to re-provision your account and make sure that you have the proper config file pushed to your modem to see if that helps.

On thing you might try is to clone the MAC address of one of your PCs into the WAN interface of your Juniper firewall (and then reboot both the modem and the firewall). That might get you a new DHCP assigned address in a different IP address block than you currently have; and that might mean different routing and better performance. I have seen that improve things on Comcast connections (but it is a long shot).
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.