Hello folks!
I'm having an odd issue and was wondering if anyone knew what I was going on.
I'm using an SB6183 with a Linux system as a router, along with wide-dhcpv6 and radvd to configure IPv6. It works great! the performance is actually greater than IPv4 in speed tests, and my Netflix problems went away when I got it working.
But there's a problem. After some time, between 12-24 hours after I start the IPv6 daemons, all connectivity goes away. I still have my prefix and IPv6 address, I can still ping6 my IPv6 default route, but Comcast stops my traffic from flowing.
Restarting dhcp6c IMMEDIATELY fixes the problem. The prefix is still the same, too, so it's not a situation where Comcast changed it.
Has anyone else seen this? Any suggestions? I was so happy I finally got IPv6 going and now this issue makes me sad. :(
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[IPv6] Strange IPv6 issue
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[Equip] Few questions about new 5341j
I've been running a 4x4 Arris TM602A for a very solid 1.75 years and just pulled the trigger on a Zoom 5341j, mostly for savings from $10 monthly rental fee that I thought I saw going up to $15, sometime, somewhere.
The Beta Diagnostic Tool has been telling me that all is well with my Arris and that it is capable of handling any of the Comcast speed packages available. I started with Performance and it has been free upgraded to about 50/6. After reading all the new free upgrades around me in the now-nuked NorCal upgrade thread, I kept rebooting the Arris but never got new provisioning. This was all tested from behind my router (see below) and I never tried connected directly from PC to Arris.
Directions for authenticating the Zoom involved by-passing the router and connecting directly from the PC nic, which I did. The process was a little bit "fits and starts" but I finally happened upon the right combination of reloads and buttons pushed. When I had internet still directly connected, I was testing about 89/6 on IPv4, a little lower on IPv6 at the Comcast test site. When I got the (IPv4-only) LAN all back together, more fits and starts, the test is back to about 50/6.
The router is a WRT54GL v1.1 running Tomato firmware and it has 100Mbps ethernet, so my naive expectation is it could pass 89, at least much more than 50, when the traffic is all to/from one computer. That's one question. Does this router have such a limitation?
Another question is the downstream power levels on the Zoom. When the tech installed the Arris, he talked about getting these close to zero +/-, ideally, and I thought he put a terminated splitter just before the modem to accomplish this:
[att=1]
They have settled not far from zero when I've looked and an example can be seen in the up-post link. Here is what the Zoom is looking like and it is slowly acquiring uncorrectables, although I've seen someone report he doesn't get any:
[att=2]
I've thought about taking the splitter out and seeing what breaks but probably someone reading this knows what's happening.
The elements of the LAN are sketched out below. PS3 is hardly used anymore. The IGEL is about 10W of a 24/7/365.25 hobby Hiawatha web server in Puppy Linux. The HP-GT7725 has an Hauppage tuner, an installation of Manjaro for recording OTA TV in Kaffeine, and an installation of the most excellent KODI, formerly OpenELEC, for viewing media files over the LAN. The HD Homerun also has a couple of tuners for OTA and broadcasts the stream over the LAN. DNS 323 stores the recordings and other video files for playing in KODI. Brother MFC and PC desktop help get things done for me.
[att=3]
Thanks.
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[CustSvc] Comcast Data Usage Metering Products are misleading
Having already read through some of the other posts I am going to vent my sac on this subject,
Here's my problem with the whole scenario. The data tools provided are crap.
July 2015 285 GB
Aug 2015 265 GB
Sep 2015 248 GB
Oct 2015 300 GB (as of noon)
When I go to the website https://customer.xfinity.com/MyServices/Internet
I can see the short form of the meter w/MAC address, etc.
(No notice here about the currency of the data)
Clicking onto the "view data usage details" link, another page is brought up
This shows the same basic data, but adds
Data Usage from October 01, 2015 October 31, 2015
Data used in the last 24 hours may not be displayed.
You have three monthly courtesy overages available. After using all three overages, you will be charged $10.00 for each 50GB of additional data provided.
But I have also downloaded and installed the desktop data usage meter
It says I used 298 GB. More importantly I says I used that amount as of 7 minutes ago.
Yes from the FAQ as part of the desktop application
Q.: The information displayed in the XFINITY Usage Meter application does not match whats on the usage meter page in My Account. Why?
A. The XFINITY Usage Meter application receives usage information based on the update frequency setting. By default, the usage information is updated every 3 hours, but could be set to refresh up to every 12 hours. Depending on this setting, the information displayed in the XFINITY Usage Meter application could differ from the display in My Account. Note that in both displays usage shown is not real-time and could be delayed up to 24 hours.
IF I sign out of the application and then sign back in the data refresh frequency should be irrelevant, especially if I have it set to three hours but I never see the "as of" value higher that about 60 minutes.
So this scenario suffers from multiple failures.
1. Depending on the tool used, the data provided by Comcast is different. These are their tools, and I am assuming (perhaps naively) that the data source queried is a unified system.
2. The verbiage associated with the displays is inaccurate and possibly purposefully misleading.
a. Web Site: (October 31 2015 at 12:42PM)
Data Usage from October 01, 2015 October 31, 2015
Data used in the last 24 hours may not be displayed.
It can't be both. It can't be "October 31, 2015" AND "data used in the last 24 hours may not be displayed"
b. Desktop App:
"Data as of 7 minutes ago." This is a definitive unqualified statement which is apparently total BS.
I think the 300 GB cap is just another money grab, but that is not the argument of this post. That is for another post.
The argument for this post is that it is essentially impossible to get close to the allotment with the tools available. Comcast expects its users to do one of four things:
0. Get a business account for unlimited use.
1. Stay substantially below the allotment, essentially avoiding potential overage charges by avoiding usage of the system up to the announced limit. This is like paying for gasoline in a car without an accurate gas gauge, knowing that if you run out there will be a service charge to add more to the tank. Also, when you go back to the gas station before you can add more to the tank you first have to empty whatever remains (first of month). So pay for 300GB/mo. and avoiding using a significant percentage, ever.
2. Use the system without attention to usage at all, and accepting that during some or all months extra fees will accrue to the account. This is essentially the extraction of customers money for using the system at the end of the month in the same way as it was used earlier in the month. Which means that the allotment is not based on any load or stress on the system but purely as a mechanism to control what users will use the system for.
3. Go somewhere else entirely. Which is the same as Comcast saying Get Stuffed to its customers, we're Comcast, and we're a functional monopoly. Eat it.
Does all this crap bother me. You bet. Because it isn't necessary. If Comcast is going to screw its customers, it should do so honestly. Make the tools accurately reflect the reality.
If you are going to hose me down, don't tell me you're using champagne.
PS. I just killed the desktop app, and then reloaded it, and logged in. Now it says my usage is 292GB as of 15 mins ago (at 1:28 PM) So somehow I unused 6GB of data in the last 45 mins.
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.sig under development
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[Signals] Side Discussion about 16 & 24 channel Downstream Bonding?
Since Comcast Supports Several Modems with 16x4 Bonding Capabilities, I was wondering If anybody out there with these modems on Comcast is seeing 16 channel DS bonding or at least more the 8channels bonded.
Mod Note: Please add reports if you have 16 channels downstream here -> https://secure.dslreports.com/forum/r29743167-Report-16-Downstream-Channel-Bonding-Here uid://455626
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Changing to a non-VoIP cable modem and keeping phone line active
I am looking to upgrade my cable modem. I currently have an Arris TM722 VoIP cable modem, which Comcast installed a few years back. Prior to that, our phone line did not run through a cable modem. I want to upgrade to a faster modem, either the Arris SB6183 or the SB6141. Neither of these, however, support VoIP. So, my question is, how do I keep my phone line running now without a VoIP modem? I don't believe there is any phone jack in the house anymore that connects outdoors since Comcast performed the installation. I spoke to a representative regarding the issue, however, they told me it's not possible for me to keep my phone line without a VoIP modem. Is this true, or are there alternatives?
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[Rant] comcast direct forum
The comcast direct forum sucks, the tech's don't help with your problem, but schedule needless service calls when it's a routing or a network issue. Typical Comcast crap.
I need them to fix my local node and they send me a service truck.
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http://www.reverse.net
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why would my line be trapped without notice? (upstream signal)
I was having problems on two upstream channels for a while: http://www.dslreports.com/forum/r30266210-Signals-T4-time-outs-on-upstream-for-72-hours-now
After having T4 time outs on 2/3 channels for a while, the issue turned into T3 timeouts. That meant that whenever my X1 box or modem rebooted and tried an initial sync on one of the two non-working channels, I had to wait 15 minutes for it to roll over to a new channel and hopefully it would pick the only working one.
After about 5 calls, where I finally convinced them that even though they could see my modem was connected i still had a line issue, they sent out a tech. There was no issue with noise on the line like I suspected, but he found a trap on the line (presumably a high-pass filter, since the two lower frequency channels were blocked). He removed the trap and did a bunch of tests and found no ingress on the line, which he stated was the typical reason lines are trapped.
When he removed the trap, all three upstream channels on the modem synced immediately at about 45dB.
Since the trap was placed on my line without any warning or notice, I'm wondering what the reasons traps are placed on the line are. It's curious that my modem went from T4 timeout to T3 timeout, and I'm wondering if my modem failed and was generating interference (T4 timeouts) until they trapped it, which sent it to T3. I had also been getting automated phone calls telling me my 6121 was not supported anymore for my plan (Blast) and I should upgrade ASAP. I wouldn't think comcast would put a trap to block an outdated modem and force it to one upstream channel right? I recently purchased a CM600 to replace my 6121, so if the modem had failed and generated the interference, the tech who was out recently wouldn't have seen it.
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-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die.
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[IPv6] SB6183 IPv6 problems
I had a perfectly running IPv6 config on my Zoom 5341J, routed through my Linux server, which looks like this:
p3p1 (WAN) is accepting RAs and has a link-local IPv6 address only.
bond0 (LAN) is allowing forwarding and is assigned a static IP from the /64 PD obtained on p3p1.
DNSmasq is serving DHCPv6 and SLAAC, doing RAs on bond0.
With the Zoom, the local Linux server, Windows machines, and mobile devices all passed http://test-ipv6.com perfectly, and quickly.
With the only change being the SB6183, here is what I see:
-Windows machines work fine and pass the test quickly every time.
-The local Linux server and mobile devices sometimes pass and mostly fail, with no consistency. Furthermore, the tests are very slow to run, even if it does pass. When it fails, the errors are all over the place (no IPv6 address, large packet (PDMTU) failure, browser blocking test URLs, no direct IPv6 access, etc.) - I've seen combinations of them all! Anything IPv6 related done directly on the server works, but is very slow or stalls entirely (example - wget on http://download.thinkbroadband.com/1GB.zip, which is IPv6). DNS lookups via Comcast's IPv6 DNS are instant. Almost seems like an MTU issue somewhere along the line that Windows isn't having a problem with, which may also explain these in dmesg (lots of them):
[22257.883035] Peer 0000:0000:0000:0000:0000:ffff:0c2f:ae63:49925/80 unexpectedly shrunk window 1023049849:1023051199 (repaired)
[22259.075034] Peer 0000:0000:0000:0000:0000:ffff:0c2f:ae63:49925/80 unexpectedly shrunk window 1023049849:1023051199 (repaired)
[22275.339033] Peer 0000:0000:0000:0000:0000:ffff:0c2f:ae63:49925/80 unexpectedly shrunk window 1023238849:1023240199 (repaired)
I've tried just about everything I can think of and it's leading me to some problem with the 6183 - I've even completely disabled the firewall and all associated rules on the Linux server, and direct access from the server still fails testing.
Any thoughts on this?
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[Connectivity] PC looses wifi connection when connecting to Comcast sites
I'm having a very strange problem. Whenever I connect to a Comcast website my pc looses the wifi connection. I have 3 other devices that connect via wifi and they do not have this problem. When I run diagnostics on the problem pc no problems are reported. To get things back sometimes all I need to do is disable the wifi adapter then re-enable it. Sometimes I need to restart the pc to get things back. I have no problems connecting to other sites I visit. All devices have latest drivers and software updates, including my router. I have no idea what to look at, so if anyone can offer some ideas it would be greatly appreciated.
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[Connectivity] CenturyLink.com blocked?
I'm in Portland, OR using Comcast Blast service and haven't been able to connect to www.centurylink.com for 2 days (I'm attempting to switch to Prism and Gigabit fiber). I've tried changing DNS settings, different browsers even different computers, but I'm unable to connect using my Comcast ISP. I have no problem using my smartphone to connect via Verizon (but not using WiFi). Before I get all in a tizzy, is anybody else having this problem or have any suggestions?
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[Connectivity] Partially loading webpages
I live in Fresno, CA. For the past two days I'm having a difficult time getting pages to load. About 50% of the time I have to refresh the page once or more to get it to work. I did a search and found a similar problem on the xfinity forums here > http://forums.xfinity.com/t5/Basic-Internet-Connectivity-And/Partially-loading-webpages-Northern-California/td-p/2637623. I and two others are having the same issue. Anyone else experiencing this?
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[Connectivity] Denver Local News report "Slow Internet? Here are 9 reasons why"
http://www.9news.com/story/news/investigations/2015/11/09/internet-speed-test-slow/75480596/
What do you think? read it tell me what you think..
9. You router is in a terrible spot
8. Your router is old
7. You router could be on the same channel as your neighbor
6. Something is interfering with your Wi-Fi signal
5. Your connection is not secured and somebody is else is using it
4. Too many devices are being used at the same time
3. Your router's firmware/software needs to be updated
2. Your service is just not reliable
1. You've got spyware or a virus
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Network Engineer, IP Engineer, Docsis..; the views expressed on this post are mine and do not necessarily reflect the views of my employer..
Gamer.. Living the dream one catastrophe at a time :)..
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new SB6141 - does my signals look good?
So I finally bit the bullet and swapped my Comcast supplied SMC modem for a brand spanking new SB6141.
This thing is fast!
Can you guys take a look at my signals and see if they are ok? I did read the FAQ but just wanted the reassurance.
Also, what's the best way to return this SMC business modem?
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[Equip] Discussion about Comcast EndOfLife (EOL) (yes or no) Modems
Mod Note: Original Topic Title: Why is the SB6120 end-of-life, but the 6121 not?
Topic change when thread was resurrected 11-11-2015.
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Please reply using the small reply button bottom right of post to which you are responding in case a subtopic needs to be separated from this one. TIA, uid://455626
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Saw this recent development on http://mydeviceinfo.comcast.net ... what gives? I always thought the 6121 was the same as the 6120, just without an integrated MoCA filter (big whoop)
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no place like ::1
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[CustSvc] Comcast call back on FCC complaint
I had a nice conversation with "D S" from the "Customer Security Assurance" department yesterday in response to my FCC complaint over the data usage policy.
Not that anything is going to change anytime soon but just wanted to put it out there that I actually had an intellectual conversation with someone from Comcast who actually seemed like they were doing a good job.
Basically we had a conversation about the usage plan and he took my input on it and logged it. Not much more you can ask the rep to do other than to listen to your complaint and send it to the right people. My complaint is that the plan doesn't scale properly with your usage plan (same cap all tiers) and they are exempting their services from cap (new stream service, etc). The rep did mention that several others have complained about the cap not scaling with speed tiers.
Comcast gets a pretty bad rap so I just wanted to put something out there slightly positive; hopefully they will actually do something with the complaints they are getting.
Anyone else get any call-backs on their FCC complaints and what was your conversation like?
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[Equip] ARRIS SB6183 or Zoom 5370
I have a SB6120 on Comcast Performance tier. Since the SB6120 is EOL and I'm going to upgrade to a higher tier soon, I would like to replace it with a 16x4 modem. I've narrowed it down to the ARRIS SB6183 or the Zoom 5370. They're both currently $89.99 on amazon. Which one do you guys recommend?
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[Connectivity] 100's of sockets to Comcast DNS servers
I've noticed occasional (yet daily) marked degradation in internet responsiveness, so I started monitoring things. Right off I see my router (which is separate from the cable modem) establishes 100's of connections to Comast DNS servers 75.75.75.75 and 75.75.76.76. My router capacity is overrun and now, while these DNS connections may be of some use, other connections (e.g., to actual websites, etc.) must wait for these DNS server connections to time out. Unfortunately, each connection is on a 5 minute inactivity timeout which I'm unable to affect. So what appears to be crappy ISP QoS may rather be my hardware. BUT, everything is perfectly fine (no delays, network performing to spec, etc.) once the router clears up all these (to my mind and opinion) USELESS connections.
So my question is WHERE (or WHAT) is (may be) making the request for all these connections?
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[Equip] tm862g for voice other modem for data
I have a new account coming online for another property, I absolutely do not want the gateway to be a "bridge" I want to have a separate modem for data, I don't care if the TM862G is a hotspot, as long as data is on it's own device... is this still possible? we use to do this all the time in the past with split configs, just don't know if they still let you do it with owned EMTA and owned modem when the emta is a gateway device
the region this is in has 12 (or maybe it was 16?) channel bonding right now, and the TM862G is only 8x4 I think?
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[AV] Possibly found a Comcast-owned headend in my area
Thing is, there's a 400 ft antenna tower with several highly directional antennas but no dishes on the ground. Why could that be?
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[Security] Comcast injects copyright warnings into browsers
http://www.zdnet.com/article/comcast-injects-copyright-warnings-into-your-browser/
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