Guys (and gals,)
AWESOME contributions! This is a great example of true blue troubleshooting.
Having worked for Verizon, I wanted to toss in my 2 cents.
First of all, did they (during your call) truly answer your questions? Typically, they won't support anything router-related, as they're usually considered 3rd-party hardware.
Since a lot of the basics have been covered, (and I'm a professional at knocking-out my internet connection,) have you done any of the following?
1.) Registry cleaner-type programs?
2.) "Tweak" programs, anything that's "Boost Speed" related?
3.) Command prompt tweaks, like TCP-IP autotuning?
4.) Had recent infections? (Seems stupid, but an elevated command prompt with the sfc /scannow command can reset proper permissions which can, in rare circumstances, tie-into connectivity-related issues.)
5.) Attempted to "bridge connections" and attempt other things like that
in the Network and Sharing Center?
If so, then some house cleaning may be in order.
It's late here, almost 5am, so I apologize if I skipped anything by accident.
Your ISP can provide you with "Static IP Address" information. If they try to sell you one, don't take the bait. It's a lie. Don't settle into one or drop anchor with it; it's highly vulnerable if you didn't know that already.
So, say you're managing via Network and Sharing Center. You click on Manage Network Connections. You see your connection (we'll use "Local Connection 1," ethernet, in this example, which works, even though it's just an example and I know yours doesn't work.)
Right-click on the target connection and choose Properties.
From there, you can get to the area you want. Status is important because it can provide simple information you would otherwise have to dig out of the Command Prompt. If you're simply missing the Default Gateway (and have an IPv4 address, for example,) then some commands may help in an elevated command prompt, or one ran as administrator:
- ipconfig /flushdns
- ipconfig /registerdns
- ipconfig /renew
- netsh winsock reset
The last command may not apply, but I was told to use it and it has made a difference in the past. WinSock isn't usually operative, but I'd not pull out any stops in this case.
Back to Static IP address. In case it hasn't been defined, it's manually plugging in the 192.168.1.1 (address of your router,) which should take you to a dialogue box (login & password request) if you plug it into Internet Explorer, even-if OFFLINE. It'll ask for a Subnet Mask, which is 255.255.255.0. It'll ask for DNS Server 1, DNS Server 2, which can be found at DSLReports.com, and performing a search. I believe the poster before me identified them. I like to go to Google.com and type: site:dslreports.com Comcast DNS Servers. (That string with the colon searches within a site.)
By calling the ISP and asking for the DNS Servers (in an effort to setup a Static IP address,) they're mainly giving you DNS Servers you'd otherwise have to go elsewhere for, get online, and lookup.
Static IP? It's the opposite of DHCP or Dynamic. Your IP address is defined, it's the one you actually plugged-in piece by piece, and it never rotates or changes. Static is locked-in, thus why it's so vulnerable.
Depending on your router brand and model, you will have defaults as to the address or Default Gateway (9 out of 10 times it's the 192.168.1.1,) and you can either call for support (most offer free phone support, but it's difficult if you have VOIP phone service,) or lookup online, such as a .PDF manual.
YOU WILL NEED TO KNOW, assuming you haven't gotten into your Router Settings Page, the default ADMIN AND PASSWORD information. Usually, it's:
Login: admin, Psw: password, or admin/admin, (blank,) password, Admin/Password, Admin/password, etc. I'm sure you see the pattern.
I personally use a Linksys WRT600N. If you Google that model # in quotes (returns only that model in results,) you'll find the manufacturer's home page linksysbycisco.com. You'll even find setup software, in their case, LELA / Linksys Easylink Advisor, as routers are NOT easy, no matter what anyone says.
Steer clear of any firmware upgrades/downloads. They're risky and not worth it. If you don't mind, what router do you have?
Lastly, if this is sudden and you specifically encounter issues with P2P-related media, then that could be bandwidth compression. In my previous work, we had download/bandwidth limits that, if a customer exceeded any given month, we'd either give a call to or, in the case of P2P (due to high rates of p1r@cy and "unofficial" material,) simply suppress P2P via a remote patch.
You have the right to call your ISP and ask for Network Securities or Tech. Support as a starter.
If you're a major downloader, as I am myself, it could very well be the triggering event for your situation.
Case in point: I simply had a good run with uTorrent a few months ago, gathered up a bunch of good iTunes-library-related albums (discographies, actually,) + movies + games, etc., and got a call. I didn't really think it would be as bad as it was, installed a usage meter and found that I exceeded 300GB in 15 days. lol.
Sorry for the diatribe (after the fact, I noticed you're MUCH more savvy than I realized.) I don't mean to talk down, moreso spell it out for anyone else who has these problems or, perhaps, clarify a detail that the more qualified folks who posted before me mised.
Thanks for taking the time to read, assuming you got to this point.
PS - Safe mode with networking; does it offer any different results? Or, login as yourself, (Start Windows Normally,) that is restarting after the (administrator CMD prompt) sfc /scannow, then create a new User Account (Administrator rights,) then try to fiddle about. See if that does anything. Sometimes the simplest things can help. Also, check devmgmt.msc (Device Manager) and click "View" and "Show Hidden Devices" to see if anything's out of whack. Check, lastly, services.msc and make sure DHCP is enabled and all appropriate internet-related services; sort them by status (running or not,) then type (auto/vs/disabled or manual.)
That's my methodology to solving these situations. If you end up needing anything specific, driver-wise or anything, I'm at your disposal; I have access to a large library of those things that I don't have to "Google" or use a program to find for me.