New Modem/Router?

[Nycz]

I have comcast xfinity here in the USA and use the modem/router that it comes with and have it wired to my PC. Just me using it since in an apartment. Does anyone else use the comcast modem/router and experience CIs in games?

[KaptCrunch]

any WiFi on the modem and brand, model of it

Edited Wednesday at 11:28 PM by KaptCrunch

[BUDMAN]

Comcast is shit, I had before ...

[KaptCrunch]

9 minutes ago, BUDMAN said:

Comcast is shit, I had before ...

yeah in canada is rogers  same crap

[Nycz]

i have the gig plan but get on average 1260 down. i have heard before that sometimes the faster speeds not on fiber like mine can have more issues unlike the slower speeds.

[KaptCrunch]

does your nic  suport those  speeds, look at the config of network interface card/chip.

IPv4 or IPv6 protocal set ? 

also check firmware of modem  is up to date

Edited yesterday at 03:56 AM by KaptCrunch

[Nycz]

my motherboard supports up to 2gbs

[KaptCrunch]

have tried network monitoring software to see whats going on 

[BUDMAN]

Comcast the upload sucks...

[Nycz]

i get 40 upload. i wish i could get the same up as down like some people do but i dont know how they get that.

[KaptCrunch]

Nycz  check your ISP  IP's address that are close to you,  first took at NIC IP address  or have tried ipconfig or tracert command in DOS then you see where is coming from

[Nycz]

the xfinity gateway modems auto update firmware in middle of the night. i think its iPv6

[KaptCrunch]

look at their modem dashboard to see settings

[Nycz]

xfinity has most of it all adjustable through their app which isnt much

[srt4fun]

Comcast/consumer routers are typically simplistic in configurations. Not much you can do wrong, lol. Basically plug-n-play.

I would suspect that your cable signal levels are off somehow. On either upstream and/or downstream too high or too low power levels can have adverse effects on your connection quality. You may be able to get speed, but have issues with stability or packet loss. This is something I have dealt with in the past. 

If you're able, take a screenshot of your modem's cable signal levels and post here. Should look similar to the attached image.

Should be able to access the admin web page by navigating to "http://<your gateway address>" (ex: http://192.168.1.1 ). user/password will be on the modem's info label (same place as your default wi-fi password). 

[srt4fun]

On that note, you would need to refresh the display of your signal levels periodically to get a better picture of them changing since it's only a snapshot of "right now". For example, during peak periods they may be too low and you need an amp. Or during peak periods they are normal, but off-peak they are too high. For that you would just have to add a splitter to attenuate the signal a little bit.

Edited 11 hours ago by srt4fun

[Nycz]

[srt4fun]

Your downstream looks great, your upstream power looks to be on the lower end.

For reference: Lower than 35dBmv is where major issues happen. Lower than 38dBmv is where possible packet loss/instability happens. Higher than 53dBmv possible packet loss/instability. Higher than 57dBmv major issues. 

Ideal upstream power is between 45-50dBmv. 

Ideal downstream power is between -8dBmv and +8dBmv (closer to 0 is better). Ideal for downstream SNR is anything above 30dB (best ~40-45dB)

Without getting too technical... The upstream power is controlled by Comcast's equipment when negotiating with your modem. However, if there is a lot of noise on the line, you can get issues at lower upstream levels. Congested nodes will likely want client modems to be talking quieter, to reduce overall noise, which may be why your power is on the low end. You could call comcast support and have a tech come and diagnose the line. Tell them you are experiencing lag/stuttering when playing games, or the like. They may also remotely adjust your upstream power. You could also try (but don't hold your breath) adding a coax splitter between the wall and modem to "trick" it to negotiate a higher upstream power, it will also negatively affect your downstream levels. Good thing is that your downstream power is excellent, so you have a bit of wiggle room there. The best fix would be that Comcast increases your modem's upstream power (whether it be by power adjustments, line repair, or node repair). 

 

Personally, I would add the splitter, check signal levels ~15-30min after modem boot, if all levels within spec, then monitor signal levels/quality over several days. If signal levels are way off, check again in another 15min, if still bad then remove splitter and call comcast.

Edited 5 hours ago by srt4fun