Ok so I just bought a new router ASUS RT-AC87R and modem Motorola Surfboard SB6141, and went through the setup. Afterwards my wired and wireless speeds dropped from 25-30Mbps to 0.5-7Mbps, and my uploads are basically non existent at 0.15Mbps. I call the devil himself at Comcast and had them send a signal, and it's still ridiculously slow and inconsistent. Everything is secured with WPA2, and there are no internet leaches steeling my internet. All of my firmware is up to date. I tried turning off all of the excess features of my router that could be slowing me down like encryption and what not, but still no luck. ASUS teck support doesn't do weekend calls so I'm kind of S.O.L. here. Does anyone know any fixes, is my router defective or what?
I'll post any updates when I learn something new to help with diagnosis.
Plugged in the old router/modem (Comcast's rented one), and everything is back to normal. I left the ASUS router plugged in and it doesn't get internet. It tells me to activate the Comcast modem, but if i wire into the Comcast modem/router everything works.
Are you testing these speeds over wireless or wired?
Not sure about your ISP, but some ISP supplied models will freak out and run poorly if you do not release the DHCP lease on the old router before connecting the new one.
I had a weird problem with that model Surfboard where I had to set the connected device to negotiate the link as 100baseTX half-duplex, even though the modem has a gigabit port. I was having similar speed woes, and even had a Comcast tech come try to sort it out. To my dismay, he said that everything worked fine for him, and he showed me consistent speed tests achieving my full bandwidth allocation. But on all of my computers, I still had shitty speeds. It was particularly frustrating because he was using a crappy Wal-Mart netbook that didn't even have a gigabit port. After he left, I ended up testing the ports on all my computers to make sure they weren't all fried or something, before finally deciding to try different link speeds. And somehow that ended up fixing the problem! So if your router has a gigabit wan port, it might be possible that this is the issue you are hitting. You could test this by wiring directly to your computer and manually configuring the link speed to see if there is a difference. I doubt you can set the link speed on the router manually, so if you do see that you get the expected speeds when set to half-duplex, you can either exchange the modem for the same model and hope you have better luck, or do what I did and just get a different model modem. I went with the Zoom model of similar specs and was happy to find no issues with it (and it was much cheaper).
FWIW, I think my problem was rather unusual and like nothing I've ever heard of before, so it's probably not your problem. But it can't hurt to be sure :)
I plugged my Comcast modem/router back in, and all of my speeds were back to normal. Then I plugged in the new router to the Comcast one to test the router, and the router's wifi speeds were good so I returned the modem and got a new one. Now I just finished hooking up the new modem and my wifi speeds are fine, but my ethernet speeds are less than half down, and again they are almost non existent uploading. Tomorrow I'm going to try to swap the router out for a new one and see if that helps. Man this ASUS 4 step set up has turned into 40 steps.
Edit..
ASUS router tech support is useless. I tried calling on my day off the other day because for some reason router support is only open Mon.-Fri. 5:30am-7:30pm, (their computer support is open 24/7 BTW) and I sat on hold for 20 min. Then I got transferred to the survey about how my service advisor was. Ain't that some BS.
I called tech support and they gave me the stupid treatment "have you tried turning it off and back on again", their final solution was to update the firmware (which I already did, but decided to humour them and did it again just to try.) Aaaannnddd, guess what it didn't work, so I went back to the store and swapped it for a brand new one. The new one works perfectly. I just got a shitty one I guess.
Thank you to everyone who posted on this forum. I really appreciate it.