Questions tagged [isp]

An Internet service provider (ISP) is a company that provides access to the Internet. Access ISPs connect customers to the Internet using copper, wireless or fiber connections.

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1answer
29 views

Port forwarding not working when client is on same local network?

EDIT: Based on the answers below, the question was in error. The issue was not due to port forwarding, but rather trying to access a server on the local network via our public IP in the first place. ...
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1answer
997 views

Can I circumvent my ISP blocking my chosen DNS servers?

My ISP suddenly started blocking my DNS (I was using google 8.8.8.8 DNS and 1.1.1.1) I could ping to 8.8.8.8 or 1.1.1.1, but no access to DNS service. I could not ping to any web address. I was ...
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34 views

can ISP know your search queries on instagram?

I've became a bit curious about what ISP can know about me. I'm already aware that ISP can read our search history and many other things but my question is that can ISP know the queries I search on ...
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Can two different computers on the same home network have different public IP addresses via different ISPs?

Comcast provides Internet service for my home network and I noticed last night that my public IP address had changed using WhatsMyIp.org. The "Hostname & User Agent" ended with the ...
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1answer
29 views

how to stop my ISP from changing my computer DNS setting

I keep setting my DNS on a Mac to 1.1.1.1 and 8.8.8.8 and ATT keeps changing it back to theirs. On my Mac! How is this possible? and how can I prevent it?
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No internet when I change my router

I have a PPPoE DSL connection. I have one router and it connects to ISP and I have internet access. But when I change it with any other router and try to connect it using using the ISP given ...
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3answers
430 views

What does ISP ping really mean?

I saw an article detailing Starlink's upcoming preorders and they mentioned that Starlink will have "latency from 20-40ms". Knowing even the basic definition of "ping" made me ...
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1answer
26 views

IPv6 accessibility and Hitron Router

For my Hitron CODA-4582U Router, this is the best I can find and come up with - However, trying to connect from internet failed: Immediate connect fail for 2607:9880:3627:ffa4:92b1:xx:xx:681f: ...
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1answer
4k views

Same Public IPs is possible?

As I understand two computers can't have the same public (external) IP address. Except for if those two computers are connected via the same router, then they can have (share) the same public IP ...
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8answers
4k views

How many internet users can an ISP assign to a single IP address?

It’s hard to believe that an IP address is reserved for only one internet user. Many internet service providers (ISPs) have to cater to several mobile Wi-Fi home subscribers in the same geographic ...
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Do ISPs advertise their IP prefixes to transit providers manually, or is it advertised automatically via BGP?

If an ISP has plenty of IP addresses to advertise to certain transit providers, do they assign some prefixes manually depending on how much they can use, or is it left entirely to ISP routers to do ...
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1answer
34 views

how to tell which ISP a public IP address belongs to?

Is it possible to know which ISP a public IP address belongs to? For example, if the company you work for has two ISPs and there is some kind of networking equipment in the computer room that routes ...
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1answer
325 views

YouTube keeps redirecting me to a strange address: “youtube.xcdn.app”

Every time I try to connect to YouTube with any browser it redirects me to this strange address: youtube.xcdn.app Ii tried to check if this address is available to everyone via “Is It Up or Down?” ...
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1answer
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Why am I getting two different IP addresses?

I have a dynamic PPPoE connection from my ISP. After logging in, the router says it's connected through 172.80.xx.xx (this is not the DHCP range for connected users), but in Google, when I search for &...
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1answer
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can i set up a reverse DNS to a public IP?

Is it possible to set up a "fake" reverse DNS to my internet public ip? I don't want to buy a fixed IP address from the ISP and have them set up rDNS for me, I need to change my public ip ...
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1answer
40 views

How can I find my next hop point for a home router?

My ISP won't provide the ip address of the modem connection. They say they are not allowed to give that information out. On their end they can see the modem and program it with their ip address/subnet ...
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1answer
42 views

Multiple different IPv6 WAN addresses same time

this is my first post, so be gentle with me for sometimes not using the correct terminology. I am using a Fibre ISP with CG-NAT (DS-Lite). I connect via IPv6 Prefix Delegation with a /56 address space....
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1answer
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When I do a GeoIP lookup, why does the nearby capital city come up instead?

(I am starting this Q/A to help a mispost on https://security.stackexchange.com/questions/242826/why-is-an-ip-address-in-a-different-city) I personally live in a smaller city outside of my State's ...
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1answer
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Figuring out the ISP of an Akamai CDN hosted site

I'm interested in the effective ISP hosting a website. The IP of the FQDN of the site leads to the Akamai CDN. Q: May I somehow figure out, which effective ISP hosts the site? This is of interest, ...
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1answer
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Do you need two separate IPs each, for hosting a website, and for hosting a mail server? [IPv4]

Edit - I am only talking about public static IP addresses here. Do you need two separate IP addresses each, for hosting a website, and for hosting a mail server? Or can I use the same IP address for ...
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105k views

How can I monitor my ISP's connection quality over time?

I've got a very bad ISP and want to monitor the connection quality over a month's time. At the moment I just wrote a script which logs ping requests to Google's DNS server 8.8.8.8. How can I do ...
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1answer
4k views

Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)?

Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)? Single incoming Coaxial Cable with Joiner/ ...
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0answers
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Cable modem suddenly has connectivity problems, captured log: what do these errors indicate?

Normally our ISP and Internet service works very well and we get speeds up 115MBPS. Today everything was going great, then suddenly we lose connectivity. The wireless router is fine. I log into ...
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2answers
27 views

Create 2 independent local networks connected to one ISP

My brother lives in the house next to me and I am borrowing him internet. He is using a Vodafone router Sercomm Vox 2.5. For me I bought the same one in the second-hand market and connected it to his ...
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1answer
3k views

Download speed spikes

My download speeds drop to about 1 kbps then spike to between 200 kbps and 500 kbps then drop to about 1 kbps for about 5 seconds before it spikes again. But if I surf the internet i get speeds ...
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1answer
70 views

How to use my TP-Link for internet and my ISP's router just for VoIP

I've just upgraded from ADSL to VDSL, at the same ISP, and with that they sent me a new modem/router and they also switched my telephone line from POTS to VoIP. I do not wish to use their modem/router ...
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74 views

What is limiting most traffic on my fiber internet? 100m service getting 15m down, 100m up

A couple weeks ago I updated my ISP service from 15Mbps to 100Mbps. This is a dedicated fiber line to our server room. I'm excited to finally be able to try out game streaming like Stadia or Geforce ...
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252 views

Error: No response from the remote server

I am an ISP and have almost 80 users. I am using powerbeams to users at some distance. For few days I am facing an issue that few users from the same side lose their internet connection for few ...
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7 views

What could be causing router to be unresponsive then suddenly appear working?

At home, my ISP has installed a small, in-wall router (Tenda EPON, with Chinese writing over the box mostly) that takes in the optical fiber and outputs Ethernet signal that goes into my "usual&...
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Throttled speed to specific IP address from within home WiFi only

I am experiencing a weird problem where: Accessing my own dedicated server at a hosting provider in France is slow between the hours of 6pm and 10pm. Just accessing this particular IP is slow, not ...
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How do I access a IPv4 web server outside my LAN via IPv6 network

I am new to IPv6 Networking. Some background: I have CCTV NVR which is only IPv4 compatible. And my ISP is only IPv6 compatible. When on my local network I can access my NVR using 192.168.1.9. Now my ...
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1answer
24 views

Router doesn't work after move

A friend moved to new house in the same city and was experiencing some very strange behavior when trying to setup his internet. Charter/Spectrum came and installed the modem and they said everything ...
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1answer
2k views

How to check if your ISP does video throttling?

I’ve recently changed my ISP and noticed that I no longer can watch video sites like YouTube in real time; I need to wait for buffering first. On both ISPs, my speed was same 5 megabits per second. I’...
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1answer
33 views

Connect two subnets via ISP switch

I have a wireless router connected to my ISP switch in my home and then a workstation connected to another port on the same switch. Can I somehow connect the two subnets or is that only in the hands ...
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1answer
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What can be the cause of this error when attempting port forwarding for SSH?

I've checked my IP on whatismyipaddress, and then I entered it on whois to verify it is public, as described here. This was superfluous already, as I've been accessing my PC from abroad via ssh ...
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2answers
30 views

Connecting to VPNs and my ISP

So pretty basic question, Say I connect to a VPN server using OpenVPN or Wireguard or whatever. For example, I connect to a VPN server with the IP address 55.66.77.88, using OpenVPN. Can the ISP I'm ...
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2answers
301 views

What exactly does an ISP see and how can I improve my privacy?

One of my friends has become a distributor (I guess) for an ISP. He asked us to buy our internet plans from him. What exactly will he be able to see that I do on the Internet? He can see that when our ...
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0answers
41 views

What to do when your DNS provider goes MIA?

I registered a couple of domain names with a VPS provider a long time ago (over 10 years). I stopped using the VPS over two years ago, but I never discontinued the DNS name registration with them. ...
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2answers
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Cannot access my box admin page

I have a problem with my ISP, I had a box installed at home but my ISP blocked access to the admin page via a browser using the gateway which is 192.168.1.254 so for every manipulation like the ...
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1answer
107 views

About ISP giving a Public Dynamic IP

The ISP gives a public IP address to its customer, and it uses DHCP to do that. Now the thing is, are they still using a nat public IP address? My own understanding would be: private IP - nat - my ...
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1answer
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Doing Traceroute/Troubleshoot within an ISP maybe using CGN?

RFC 6598 states that 100.64.0.0/10 is an shared address space and can be only used when service provider router is capable of doing NAT across router interfaces when the addresses are identical on two ...
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22 views

What conditions are there for me to access my router using it's public IP?

I've noticed that I can only access a router's login page when my current IP is in the same block as the router's IP. The IP's my ISP give my router are always within certain ranges, for example 12.34....
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1answer
100 views

I keep getting short internet outages but my ISP says everything is fine. How should I proceed?

I have a fibre internet connection as is typical in the UK - normal telephone cable to my house, then a combined home modem/router. My connection is generally stable and consistent in terms of ...
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0answers
52 views

What does it mean that I can detect two different public IPs from the same workstation?

Recently while trying to set up a new VPN configuration, I found out that I could detect two different public IPs: one by querying google (what is my ip) and the other by curling ifconfig.co. This ...
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2answers
3k views

Router speed not matching my ISP speed

My ISP recently upgraded me to 150 mbps, I can only get close to this if I wire directly from the modem to my computer. If I wire through my router it maxes at 55, the router model is Linksys E1550, ...
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45 views

Why is my Internet download speed so slow when connected to other servers than my ISP's?

I'm having a 30 Mbps connection(FTTH). This is my speed test result obtained from speedtest.net Speedtest Result The last result is when connected with my isp's server. I'm only getting the mentioned ...
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56 views

Port Scanning Shows ALL Ports Closed On My Public IP - Home Server Setup

I just switched over to centurylink fiber. C4000XG gateway. I've run servers out of the house for a decade or more and am intimately familiar with port forwarding and firewall settings and everything. ...
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2answers
35 views

2 ISP's into one network

So the situation I've gotten myself into is this: I have a client with a rural property that we've done some automation and networking work for as part of his new home build. The problem we had, is in ...
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0answers
657 views

IPv6 Config on Asuswrt-Merlin (374.43 LTS releases)

For my home LAN I use an ASUS RT-N66U running the Asuswrt-Merlin (374.43 LTS) fork which is a nice simple and stable firmware and also updated regularly. My ISP is BT in the UK. I have been using ...
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2answers
3k views

How to disconnect/connect ADSL modem connection to ISP by command? (Windows 7 SP1 x64)

I want to write that command in a .bat file and run it by windows scheduler at certain times of night and morning. (for example: open connection at 23:00 and close it again next day at 9:00 ...

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