Comcast Business Support Community

Business and residential service at same address

I work with people who are in Europe and 7-8 times zones earlier than me. I had Comcast residential TV, internet and phone in my home for 20+ years. Never had an issue doing video conferences. post COVID, the bandwidth in our neighborhood seems to be maxed out. While I get 500+ Mps download speeds,

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Business and residential service at same address

I work with people who are in Europe and 7-8 times zones earlier than me. I had Comcast residential TV, internet and phone in my home for 20+ years. Never had an issue doing video conferences. post COVID, the bandwidth in our neighborhood seems to be maxed out. While I get 500+ Mps download speeds,

Single coax into house should be no problem. Comcast knows how to split to two modems running on different contracts. The raw coax bandwidth is greater, in general, the what you may demand or be delivered.

The Customer is happy

Long long ago in a galaxy quite close A Comcast Tech was on time for an appointmentComcast Business Internet was installedIncluding a new drop and lightning arrestorIPv4 and IPv6 functioned flawlesslyDownload and upload speeds were satisfactory(The 7th bill was correct with no adjustments) Today,

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The Customer is happy

Long long ago in a galaxy quite close A Comcast Tech was on time for an appointmentComcast Business Internet was installedIncluding a new drop and lightning arrestorIPv4 and IPv6 functioned flawlesslyDownload and upload speeds were satisfactory(The 7th bill was correct with no adjustments) Today,

A short time ago in a back yard quite close At 10:43 AM my modem showed no connection. (A shallowly buried coax cable had been dislodged and broken by tracked loader pivoting over the cable.) A ten minute call set up a 2-5 PM truck roll. A few mi

High packet loss on Comcast hop

I'm working with Cisco on troubleshooting some issues my organization is having with WebEx. I'm running Visual Traceroute to Cisco's destination address and one of the hops, AS7922 which belongs to Comcast, will always have a packet loss of 50-70%. Is this normal?

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High packet loss on Comcast hop

I'm working with Cisco on troubleshooting some issues my organization is having with WebEx. I'm running Visual Traceroute to Cisco's destination address and one of the hops, AS7922 which belongs to Comcast, will always have a packet loss of 50-70%. Is this normal?

Packet loss when pinging an intermediate node in a traceroute result is not unusual. And, in fact, is almost meaningless. The ping result of importance is the end-to-end packet loss which, in your example, is zero. A more detailed response is in "

Please recommend a modem with DHCP reservations

The school currently uses an SMCD3G-CCR which has performed well for years. Some new building control equipment needs a DHCP reservation because it can't be configured with a static IP address. When I spoke to the Comcast tech rep today, he said I needed static IP addressing. Since I want a local n

Just shy of three years since the gateway swap and IPv6 and NATted IPv4 are still working fine. The DHCP reservation for the HVAC controll system is still working, untouched by management for all this time.

Summary: status of Comcast IPv6

Comcast has made a lot of progress on IPv6 and its quite useable. Here is a summary that might help others though it is from a fellow customer and not from Comcast support. First some basics (as I've noticed a wide variety of experience on this forum - and sometimes with first level comcast

"Is it static or DHCPv6-PD?" Simply, "Yes." Comcast_Gina's reply implies that Comcast administratively provisions a fixed prefix reservation which produces the effect of a static prefix assignment to the customer equipment. From the customer viewpoi

Hairpin/Loopback/NAT Reflection

Hello friends. I have an access control program that wants to connect through a web-delivered program. I've set up port-forwarding, and it works fine when I'm outside the building. However, I can't reach it from inside the building. I assume because the source IP and destination IP are the same. Ca

Assuming IPv4 Addressing: How does the access control program determine the target IP address? There are various techniques that can be employed to utilize local addresses rather than global. A local-only DNS service can provide local IP addresses

Old and new Xfinity speed tests...2 radically different results

So we upgraded our internert to the Comcast Business 500 download speed plan. Sitting at my desk and running a speed test on http://speedtest.xfinity.com/. My results are 423.7 down/ 38.0 up, about what I would expect. When I use the "try our new speed test," link which takes you to https://speedte

My results for download are in general agreement between the two xfinity speedtests. However. The beta speed test does not display or allow choosing IPv4 vs IPv6 The beta speed test does not check or display upload speed The beta speed test does n