Questions tagged [internet]

For questions about interconnected networks.

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12 views

occasional loss of internet [on hold]

I have been trying to troubleshoot an issue with my home internet dropping occasionally over the past few months. I recently replaced both my router and my modem so I doubt there is hardware failure ...
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0answers
20 views

How to determine root-cause of network latency and disconnections [on hold]

I am connected to internet through ADSL. It happens frequently that i see very sharp latency in internet speed and even sometimes i am not able to browse. When calling the ISP they confirm they do not ...
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1answer
50 views

Why Internet protocol is divided in rows?

In simple words, why IP packet is divided in rows each one is 32 bit in length? For example this attached image shows the IP packet has 32 bit in the first row then another 32 bit and so on. Is it ...
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2answers
36 views

How fast DNS Propagation can practically be? [closed]

I've found via web search how info (i.e. DNS name-IP number pairing) is updated on authoritative DNS servers: https://www.freecodecamp.org/news/understanding-the-domain-name-servers-46c6bcf9afa3/. ...
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0answers
45 views

What is UDP traffic on port 80 and 1024? [closed]

I am currently investigating a set of anonymized passive Internet traces from a monitor in New York. There I am seeing a lot of traffic on UDP ports 80 and 1024, and I was wondering what that could be....
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1answer
39 views

How cellular networks gets internet? [closed]

Mobiles get internet but how? From the towers, we used to get signals and communicate with others like calling or a message but coming to the internet how in the terms of networking terms like radio ...
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1answer
29 views

What happens if we try to access an IP Address that does no exist

Beginner Question: I just read an article talking about how the internet works and how routers make sure that packets arrive at the destination. However there is one thing that is not explained ...
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1answer
32 views

Bonding and switching between 2 different Links/WANs/Interfaces

Before I ask anything, I'd like to say that I pretty much searched a lot (to what I know of from keywords and terms such as "bonding" "wans" "links" "failover" "aggregate") and I couldn't find any up ...
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1answer
40 views

MAc address or IP address? which one gets used from my pc to router? [duplicate]

Question 1) which one is used nowadays? NAT or PAT? Question 2) as I knew, when my pc requests some website, what happens is , the data(packets) from my pc go to router. then router makes the request ...
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0answers
57 views

Block internet on a Cisco catalyst 3560 port

Good day Is there a way to block a specific port in a Cisco Catalyst 3560 switch to block the user from accessing the internet but still have full access to the internal corporate resources. The ...
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2answers
936 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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1answer
46 views

Estimating bandwidth requirements and productivity gain from traffic data

My small office has a 30Mbit/s internet connection, on which two or three people work. We could get twice the bandwidth at a substantial cost. I imagine a bandwidth upgrade would slightly improve ...
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2answers
96 views

What's the role of Default Gateway?

It acts as the "gateway" to the Internet,but also from what i have read,it's the last thing a packet would be sent to while trying to route (when checking the senders' route table). Maybe it's the ...
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6answers
6k views

What stops someone from configuring their network with IP addresses they do not own?

Here's the scenario. I was picturing a university that bought a range of IP addresses. I think they'd still be inside a ISP (right?), but they'd have freedom to configure stuff the way they wanted. ...
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8answers
5k views

Why are IP addresses given to each interface and not device? What would the implications of that be?

Why do we need to give IP addresses to each interface? Wouldn't giving one to each device be enough?
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1answer
95 views

Analyze Network Traffic by Autonomous System Number?

I'm looking for the way to take an estimate consumptions toward internet per Autonomous System Number which could help me to make a decision if it's necessary to establish a peering with this AS's ...
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1answer
156 views

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 ...
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3answers
78 views

How is traffic forwarded though IXPs if route servers do not forward any traffic

while i was studying about IXP route-servers, i read that they do not forward any traffic. I get that a route server is a "control plane" entity and it is used for easier bgp peering. However, i ...
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1answer
276 views

Download Internet Routing Table

What is the best way to download a snapshot of the Internet's IPv4 routing table? I need check if IP addresses are routable. It needs to function offline, so a looking glass server won't work. I know ...
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2answers
91 views

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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1answer
42 views

Multiple Networks on Sonicwall with no access to cisco firewall

The issue im having is that i have 2 networks with 2 internet connections. We now all of a sudden have a POS system handling our network. This system blocks our email and a bunch of pages we use. They ...
4
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2answers
636 views

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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1answer
405 views

Are Protocols written in programming languages?

The protocols such as HTTP, IP, BGP are written in programming languages or simply plain English text ? If it is written in plain English, then how it is communicated with web browser, switches/...
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3answers
1k views

Need help understanding how packets travel across the internet

I've been learning about networks recently at a new job, and I did a presentation on what I've learnt so far. When I was describing the relationship between the datalink and network layer, I mentioned ...
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1answer
32 views

Are there any advantage of using multiple threads for a file upload, for an internet connected node? [closed]

I got asked in an intervew recently to design a file upload feature. After initial discussion, The interviewer asked if I can design for multiple threads. My thought was, As the network bandwidth is ...
6
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2answers
183 views

Why is internet speed called Bandwidth?

Why do we refer to our internet speeds as "bandwidth" with units of measurement like "10 Mbps"? As I understand it, Bandwidth is, as the name implies, the width of the frequency band, typically ...
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1answer
439 views

How to find a AS-SET of an asn?

How can we find the as-set of asn? For Example I have the asn:32934. I want the as-set?
18
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2answers
3k views

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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1answer
251 views

How can I reduce latency to Australia from another country? [closed]

I often do a lot of work from the UK to destination networks in Australia be it voice calls or something more benign like gaming. Both of which work best with the lowest RTT possible. On average the ...
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3answers
116 views

Why do we need an ethernet MAC address? [duplicate]

Don't think it's a duplicate. I've searched really many articles and couldn't find the satisfying answer. I understand : how ARP works MAC address is an unique address for each NIC IP is network ...
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1answer
92 views

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 ...
2
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1answer
64 views

What does 22/23 and 10.3/11.4 mean and why cannot access internet?

What does this specification mean? I asked the one who gave me this but I did not understand. Vlan 22/23 192.168.10.3/11.4 a) Does 22/23 mean that 23 subnets have been allocated b) The forward ...
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0answers
35 views

Internet not working [closed]

I have this types of network in my office. Recently we have moved to new i BSNL internet. My problem is when i bypass router and connect poe cable to computer internet is working but when i put ...
2
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1answer
84 views

Definition of bandwidth capacity for an internet connection

First, I want to test the data rate of a fibre-optic internet connection, but I understand that results are affected by the circumstances of the test, like number of hops between the CPE and the other ...
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1answer
508 views

What is the maximum distance that a cable/fiber optic internet connection can operate without the internet quality degrading? [closed]

I hope that this is not an ignorant or misinformed question, I am new and I'm trying to learn more about internet provision. I have read that DSL has a maximum distance of 18,000ft (or 5.5 Km) before ...
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0answers
93 views

Frequent Internet Disconnection [closed]

Hello everyone! I am relatively new to this forum, and wanted to get some useful feedbacks and resolution from "network-PROs" on my problem.. I have a network with a main router connected to the ...
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4answers
1k views

Can we run the Internet on circuit switching?

Generally we use IP and ATM for data communication and can we use circuit switching for data communication ? Can we use circuit switching for Internet ?
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3answers
1k views

Is QoS an issue for VOIP calls over the Internet? If not, why not?

I'm trying to decide whether I should buy SIP trunks from my ISP or a 3rd-party. As I understand it, it's important to maintain QoS on an internal network (i.e. prioritize VOIP traffic). Is this not ...
3
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2answers
94 views

Before the invention of Classless Inter-Domain Routing (CIDR) did hosts have subnet masks assigned?

Before the invention of CIDR, did hosts also have a subnet mask assigned or only have an IP address and the network was determined by the class of the IP address?
2
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1answer
194 views

How do protocols like PPTP, L2TP work below IP level

I have been using these protocols without deep understand how everything works under the hood. I understand a process of tunneling as follows When we are using protocols like OpenVPN, IPSec, SSH ...
2
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2answers
735 views

What exactly is the local loop?

It would be crazy to have two transmission lines per every subscriber run from the subscriber to the ISP, do ISPs use a multiplexer then?On a cable network everyone is on the same line so multiplexing ...
2
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2answers
70 views

Is “Mobile Router” a Thing in Real Life?

As you all know IP indicates your location in the internet. Although end devices can move and relocate, routers (the backbone of the internet) are static. Thus, they keep meaningful routing and ...
3
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2answers
145 views

Does each router have the IP addresses of all the routers and hosts connected to the 'Internet'?

I am new to computer networking,and was reading about the topic routing. According to my understanding,each router has a routing table associated with it. From that table it could know,which output ...
2
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1answer
42 views

Traffic Destined to X Should Bypass a Certain AS Y

Let's say you do not want the traffic destined to your /8 prefix to traverse AS Y. How would you modify your BGP configuration to do that? Thank you for your time
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2answers
5k views

Is it true that the fd00::/8 address range (ULA) in ipv6 is for machines that you NEVER want to speak with anything on the Internet?

Is it true that the fd00::/8 address space (User Local Addresses) in ipv6 is for machines that you NEVER want to speak with anything on the Internet? I was just reading that here and rather surprised ...
7
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2answers
790 views

What are the differences in the contents of datagrams, frames, and network packets?

I'm reviewing the networking security unit of the class I'm in, and I had a question. I know that datagrams are packets at the transport layer of the OSI model, whilst frames are the name for packets ...
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1answer
57 views

Do packets travel through household routers or only designated ones? [duplicate]

I'm trying to wrap my head around the path the packets take on the internet. I know that they hop between multiple routers until they get to their destination, but are these routers only in ISP's ...
5
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1answer
150 views

Class A most significant bits '0' as in RFC1166 or older or '00' as suggested in RFC4632?

I was just reading RFC4632 "2. History and Problem Description" and I don't get the part about Class A with MSB '00'. That would in my understanding mean, there are actually only 64 available networks,...
5
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1answer
139 views

What's the domain of an IP?

CIDR stands for "Classless Inter-Domain Routing". But what's a domain in this case? Seems to not be the same kind of domain as DNS deals with...
2
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1answer
76 views

What is the preferred way to prevent a particular subnet from being sent to one ASN

I have the following network. I want to prevent Subnet 2, S2, from being routed outbound of ISPA (preferring ISPC is also acceptable). None of my ISPs use BGP communities. Given that this is a live ...