Network Management Information Center

Recent Network Management News:

Revision of Comcast’s SNMP and SMTP Policies

Published on Wednesday, August 01, 2012

We've announced some changes our policies on Simple Network Management Protocol (SNMP) and Simple Mail Transport Protocol (SMTP), which will affect a very small portion of our customers.  You can find more information in two blog posts. One is a general post about both issues, and the other is specific to SMTP. While the policy change was announced today, implementation will occur gradually.

Comcast to Replace Usage Cap With Improved Data Usage Management Approaches

Published on Thursday, May 17, 2012

We've announced some important changes – there’s more information on our blog and our FAQs for more information. We will be revising our Acceptable Use Policies in the near future.

DNSSEC Deployment Completed, Domain Helper Deactivated

Published on Tuesday, January 10, 2012

As noted here on our blog, we have signed all of our domain names and all customers are now using DNSSEC-validating resolvers. Comcast is the first large ISP in the North America to have fully implemented DNSSEC, as part of ongoing efforts to protect our customers with Constant Guard™ from Xfinity. In addition, Comcast Domain Helper has been turned off, as we noted here.

Your Internet Service Performance

Published on Friday, November 18, 2011

At Comcast, we periodically review and revise our website to ensure that customers have the latest information about our services. We have revised our Internet service performance and Internet 2go service performance webpages to give customers the latest information on these services and help them make informed choices. You can read more about the performance of these services here and here.

IPv6 Pilot Market Deployment Begins

Published on Wednesday, November 09, 2011

Comcast has started our first pilot market deployment of IPv6. This first phase supports directly connected CPE, where a single computer is directly connected to a cable device. A subsequent phase will support home gateway devices. To learn more, check out FAQs on the pilot market deployment and the announcement and technical details on our blog.

Rules Regarding the Attachment of Devices to the Network

Published on Friday, May 20, 2011

Does Comcast have rules regarding the attachment of devices to our High-Speed Internet network by customers? Yes, and you can find information concerning the devices approved for use on the network, and the tiers of our service that they are appropriate for at In order for a cable modem device to be approved for use on the network, it must pass CableLabs certification, UL certification, FCC certification, and Comcast DOCSIS certification testing. Comcast's current DOCSIS device testing requirements and the test scheduling process are described here.

Your Internet Service Speeds

Published on Thursday, March 10, 2011

Comcast provides residential and commercial customers with a variety of high speed Internet plans from which to choose, ranging from our Economy tier (with download speeds up to 1.5 megabits per second ("Mbps"), and upload speeds up to 384 kilobits per second ("kbps")) to our Extreme 105 tier (with download speeds up to 105 Mbps, and upload speeds to 10 Mbps). Comcast provisions its customers’ modems and engineers its network to ensure that its customers can enjoy the speeds to which they subscribe. However, Comcast does not guarantee that a customer will actually achieve those speeds at all times. Without purchasing an expensive, dedicated Internet connection, no Internet service provider ("ISP") can guarantee a particular speed at all times to a customer. Comcast advertises its speeds as "up to" a specific level based on the tier of service to which a customer subscribes. Read much more about this topic here.

Updated Network Management FAQs

Published on Friday, January 28, 2011

Comcast created this site in 2008 to transparently disclose our network management practices, and we have updated it with relevant information since its inception. Today, we have updated our network management FAQs to describe and explain our current network management practices for our high-speed Internet services.

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