Recent Network Management News:
- Published on Tuesday, April 08, 2014
On May 20, 2011, we first posted about these rules. Those rules have now been updated to reflect that IPv6 is now required, that DOCSIS 1.1 and 2.0 modems are now or soon will be in end-of-life status, and that we are preparing for DOCSIS 3.1 modems.
These rules pertain to the attachment of devices to our High-Speed Internet network by customers. 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 http://mydeviceinfo.comcast.net. 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.
Please also note that customers may purchase their own cable modem for use on the Comcast network. However, Comcast does not support all possible modems on its network because there may be compatibility issues with some devices. The Comcast Agreement for Residential Services (Sections 6(b)(1)–(3)) makes clear that a device must meet Comcast’s minimum technical specifications in order to successfully install, access, operate or use a particular service. In addition to our full list of approved devices, a list of recommended retail devices can be found at http://mynewmodem.comcast.net.
- Published on Thursday, March 13, 2014
Recently, the Internet community has taken notice of NTP amplification attacks, as well as other attacks leveraging DNS, SNMP, and other protocols. These attacks take advantage of the fact that some networks have not taken steps to prevent network address spoofing. Since we have been asked what steps Comcast takes to prevent network spoofing, we have put together an FAQ on the subject.
In short, we use one of two techniques: Unicast Reverse Path Forwarding (uRPF) verification and DOCSIS Source Address Verification (SAV). Using these techniques our customers are prevented from sending traffic with spoofed IP addresses through their cable modems.
Read more about this topic here in these FAQs on preventing network spoofing.
- 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.
- Published on Thursday, May 17, 2012
- 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.
- 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.
- 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.
- 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 http://mydeviceinfo.comcast.net. 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.