Questions tagged [internet]
For questions about interconnected networks.
254
questions
0
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0answers
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 ...
0
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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 ...
0
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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 ...
0
votes
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/.
...
1
vote
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....
-1
votes
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 ...
0
votes
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 ...
2
votes
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 ...
-1
votes
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 ...
0
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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 ...
7
votes
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 ...
0
votes
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 ...
1
vote
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 ...
21
votes
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.
...
11
votes
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?
5
votes
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 ...
0
votes
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 ...
2
votes
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 ...
0
votes
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 ...
1
vote
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 ...
1
vote
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
votes
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 ...
1
vote
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/...
5
votes
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 ...
1
vote
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
votes
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 ...
1
vote
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
votes
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 ...
1
vote
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 ...
-1
votes
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 ...
1
vote
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
votes
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 ...
1
vote
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
votes
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 ...
0
votes
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 ...
1
vote
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 ...
-2
votes
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 ?
6
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
7
votes
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
votes
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 ...
0
votes
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
votes
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
votes
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
votes
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 ...
