Questions tagged [isp]

Questions relating to the operations of ISPs and interacting with them.

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How do ISP's calculate a customers internet bandwidth [closed]

While calculating the amount of bandwidth a customer is using, specifically what parts of an ethernet packet does an ISP(/router) that take into account? Three parts of an ethernet packet: Physical ...
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Is there a difference between BIDI LR and DFB BiD or are they compatible?

My ISP is offering 25GBit Fiber soon and I am looking into the required hardware. One of the devices I will need to purchase is a new transceiver that can handle the speeds. The one my ISP recommends ...
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How can I use two WiFi routers with one cable to the ISP router?

Let me explain... There is the fiber optic ISP router on the first floor, connected to it via LAN cable is a switch, connected to the switch via LAN cable is a WiFi router on the 7th. I want to add ...
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Overlapping IP addressing on dynamically assigned wireless VLANs (can Fortigate do this?) [closed]

Broad question touching many vendors. CONTEXT DESCRIPTION For a project of a client of mine (I'm giving the context to make things clearer, please don't reply with "get a professional", I'm ...
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1 answer
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In practice, how are BGP Advertisement destinations determined and configured?

Say there is ISP-Alice (ISP-A) and ISP-Bob (ISP-B). They both serve neighboring areas, but they currently only peer with ISP-Charlie. They want to change that and peer directly with each other to ...
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If IPv6 exists, why do we still pay for static IPv4 addresses?

Given that there is some ridiculous number of IPv6 addresses per every single person on the planet, why do ISPs still charge for IPv4 addresses? Why not just give the user an IPv6 address? Is it ...
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A possible solution to offloading clients on an existing network

I am working with an existing network that services approximately 1500 rural wireless clients [diagram: Customer], and it uses a single core Arista 7050T layer3 switch [diagram: Main Router] hooked up ...
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1 answer
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What is ISP proxy?

One of my customer requested to implement data center for server space rental service. He need to rent his server for data center and ISP proxies. I can setup as a data center. But i have no idea ...
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6 votes
2 answers
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Is a point-to-point T1 line literally a line in real life?

In Packet Tracer this is how we draw a WAN link, or a T1 link: Does the "red line" here literally means there is a single cable connecting the two routers in real life? If no, then what are ...
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Multiple IP address on an unmanaged switch

Sorry if this question have been already asked. My ISP is providing multiple public IP's on an interface. Can I use an unmanaged switch to conect to ISP's interface and then connect this switch to ...
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Why are ISPs arranged in hierarchies?

ISPs are organised in a hierarchy where the Tier 3 ISPs are connected to Tier 2, and Tier 2 ISPs are connected to Tier 1 ISPs. Why are they organised in a hierarchy? Is it because if all devices were ...
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Peering of ISPs

How does having multiple peers affect an ISPs performance? If I have 2 option of ISPs to select from, where ISP1 has only 2 peers and ISP2 has 10 peers, which one should I select? Or does number of ...
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Is ATM a Wide Area Network?

Is Asynchronous Transfer Mode a wide area network? Or is it just a framing protocol? What I mean by wide area network is that, if there is such a thing called "ATM provider", does it mean ...
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Where are ATM switches located in real life?

Consider the following diagram from this link: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/bbdsl/configuration/xe-3s/bba-xe-3s-book/bba-ppoe-atm-xe.html If I am correct, here's how I see it ...
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Why is OSPF more popular than IS-IS in enterprise networks? [closed]

I've read that IS-IS is more popular than OSPF in Internet Service Providers due to historical reasons (mainly that initially IS-IS had better hardware support and wasn't for IP only). But why did ...
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How is traceroute able to display hostnames?

When performing a traceroute, what function on the ISP gateway is advertising the hostname? When we traceroute to Google.com for instance; Tracing route to google.com [216.58.213.14] over a maximum of ...
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1 answer
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How are Upstream Frequencies assigned for Cable Modems? [closed]

For the past week I've had serious internet issues where people couldn't use my services because of packet loss and upload speeds plummeting to kbit/s resolution (0.09 mbit/s). I noted that one of my ...
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2 answers
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Ping responses to the Gateway

Last week, I have experienced a strange scenario with Adtran NV3448(a router) and an ISP circuit. Adtran is a similar company like Cisco, also makes networking equipment such as Router, switches, etc. ...
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3 answers
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What is the relationship between an ISP and an AS?

Can one AS unite several ISPs, can/does an ISP own several ASes? No matter what I read nobody really clarifies this relationship or at least doesn't writes it down. Or is ISP and AS just a synonym? Is ...
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CMTS (DOCSIS 3.0) with CGN (CGNat)

For a new project/building I am working with the CMTS model MA5633-XB10 by Huawei. The usual way is done by implementing two DHCP servers in the same VLAN, from which the CPE gets the private IP ...
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Who owns the in-between routers displayed when I execute a traceroute command?

When i traceroute a website, i get the IPs of all the routers in the path between me and the website. Who owns all those routers? Are they organized in a particular kind of building?
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Can you become your own ISP?

How exactly does an ISP connect you to the vast network of computers which is the internet? In my area there are several ISP's. For example. Bell, Rogers, and Cogeco all connect you to the "same ...
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After routers within an AS have their routing tables sorted, how router A make sure the packets from it take the most efficient route to router Z?

Question in the title. I know a bit about IGP. My understanding is that these protocols only ensure every router in an AS knows about other routers within the AS. So, the scenario, correct me if I'm ...
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How can a server from US connect to a tier 1 ISP?

According to this graph : here is a full size version The facebook AS32934 server in the US is direcly connected to DE-CIX in germany. How can that be possible ? Is there fibers over the ocean ?
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Active\Passive Routers w\ BGP

What I'm trying to do is take two routers, "A" and "B" where 'A' is the primary router. Just like with active\passive firewalls and HSRP I want to "float" the default gateway between either Router A ...
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How does ISP know which port to open for incoming answer from a site requesting, since sites answer in different ports from ones we ask? [closed]

I wondering how does ISP open door for incoming answer from a requesting site since the answer doesn't come from the requesting door, and how to achieve my computer IP since it's behind ISP firewall, ...
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Modems involved in dial-up connection

I am currently studying the textbook Computer Networking -- A Top-Down Approach (7th Edition) by Kurose and Ross. In a chapter on Home Access: DSL, Cable, FTTH, Dial-Up, and Satellite, the authors ...
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Single-homed connection to ISP without NAT feature

Is it possible to connect my private network to the ISP router without a Network Address Translator (NAT) feature enabled on my router? As I understand, in a single-homed scenario connection to ISP, ...
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WiMax technology

Does WiMax technology is used by an ISP for providing cellular internet services? Are WiMax technology different from cellular technology for providing internet? Please mention the difference if ...
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ASA ISP limit of ISP Speed

I've got configured ASA with two ISP. First is main ISP and second for backup. Is possible to set on conf of ASA if the speed of main ISP will be at low bandwith, ASA will active a backup ISP?
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Reasons for buying ASN for organisation that are located at single place

I see here that even some organisation/universities have bought ASN which are located at single location. What benefit they will get by buying ASN ? Is it compulsory to buy ASN if I have to buy some ...
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What technique is my ISP using to censor web traffic? [closed]

BBC news is censored in the country where I live. Out of interest I decided to briefly look at how this is done. First of all they apparently MITM DNS - if I look up BBC domains on Google's 8.8.8.8 I ...
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What does NAT64 do which can't be done by deploying IPv6 + NAT444?

Why was NAT64 developed? What does it do that can't be done by deploying IPv6 + NAT444, and allocating your customers a (public) IPv6 and a (private) IPv4 address (behind a shared public IPv4 address)?...
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2 answers
1k views

How to know if ISP network have multiple routes

When it is time to choose an ISP in a remote area, I hope that the chosen ISP is having an acceptable redundancy in his network. Is there any way to verify all different route an ISP is having in his ...
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Map of WAN cables in general [closed]

Whenever i search for the physical location and path of WAN connectivity, i only find submarine cables, and a site that seems like a paid service. Is there no free map where i can e.g. show the route ...
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How does cellular data differ from an ISP, and what can be tracked?

Are IP addresses given to a phone static or not? Also, how can phone companies keep track of a person if they wanted to find them? For example, I don't have an account and use a pre-paid card. I'm ...
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3 votes
1 answer
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Public and Private IPs

I wondered if someone could explain this to me. At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
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1 answer
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How do i find out if a LAN is behind a multi-level NAT? [closed]

Not much i can specify here - its obvious that my CPE is NATing my LAN, but how do i find out if my ISP is using a carrier-grade NAT (obviously, without asking them)? I heard that port forwarding is ...
7 votes
2 answers
1k views

How do routers on the backbone avoid IP address conflicts?

As the title suggests, how do ISPs, and other networks connected to the backbone ensure that their host network address isn't already in use by another backbone node, as there is no controlling device ...
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Which part of an IPv6 address is assigned by the RIR?

Given my PC or any other, which part of the IPv6 address is allocated by the RIR and which part is allocated by the ISP? I know a prefix of /64 is commonly used, does that mean the bits before the /...
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In one organization having two ISP which configured on fortigate firewall ? How can we do the failover for internet?

Organisation don't have AS number .As of now we are doing manually route for any ISP at a time. when default Internet link is go down that time making second link enable on firewall. I saw the some ...
3 votes
1 answer
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WISP Network Edge Device - Router vs Switch

I am faced with an issue right now working for a small rural WISP. We have roughly 250 wireless customers throughout our area using Ubiquiti radios. Our main fiber drop comes in from a larger ISP on ...
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4 answers
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Can I make 2 ISP providers' IP addresses into 1 IP address?

We have 2 ISP providers (X, Y) and we have connected the ISPs to a core switch>Sophos firewall>Switch rack>end user (LAN & WiFi). This ISP works on fail-over mechanism. The issue here is that we ...
1 vote
2 answers
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Can large ISPs really offer 1Gb "dedicated" service to every home and business?

Hopefully this is on topic for this site. While researching synchronous carrier service, so called EDIA or Ethernet Dedicated Internet Access, to a rural location in New Hampshire, USA, I came across ...
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2 answers
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Internet structure and ISP networks in detail

I am studying about internet structure, ISPs and their interconnection. However, I have trouble connecting some terms and understanding the greater infrastructure of internet in more detail. I will ...
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1 answer
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Pros and Cons of two different ISP connection Model

I have seen two different models to connect My Server to cloud. Model 1: DNS ------| |---ISP_Router---Cloud----DSL Modem---Office_Router---Switch---My_Own_Web_Server Google ------| ...
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2 answers
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Is it common for ISPs to connect to each other directly?

I'm reading up on the relationship between latency and ISP interconnectivity (that higher ISP interconnectivity results in lower latency, which makes sense to me). My understanding is that IXPs ...
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Different Source and Destination IP to and from ISP [closed]

Could somebody tell me which model the ISP are using ? I have a leasedline WAN with following information. IP: XXX.XXX.XXX.123 Gateway: XXX.XXX.XXX.126 Subnet: 255.255.255.248 The problem is every ...
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How can I use a firewall as Internet Breakout?

I am currently installing a firewall in my company (using OPNsense) but I was asked to use the same system as "Internet Breakout" as well. Does anyone know how to accomplish this? I understand that ...
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Would it be possible to split ISP connection via Switch?

In my current setup, my ISP is directly connected to my firewall. Now I want to add a PC that I can put Static IP to test the ISP directly outside of the Firewall. would this be possible? I have 5 IP ...