Questions tagged [internet]
For questions about interconnected networks.
342
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frequency channels and wifi
i always hear that when i want to use multiple access points, i have to make them use different channels to avoid the interference of the radio waves. supposing that i have a router with built in AP(...
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Communicating Between Two Devices When One Lacks Internet Access
I am currently developing a software that needs to establish communication between two devices. Device 1 has internet capabilities, while device 2 may not always have internet access. I am ...
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Does an official list of tier 1 ISPs exist?
I'm trying to find an official list of tier 1 ISPs. I found a list on Wikipedia but can't quite understand how it was compiled, it just lists AS rank as a source.
I also found some other websites that ...
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Networking across campus with multiple ISPs
I currently have a campus that gets service from two ISP's that are each connected to their own router. The ISP's ingress and their routers are in different buildings on the campus. The buildings are ...
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Geolocation specific ASN
question: is it possible to determine the geolocation of a city/region of a specific ASN? For example, Telecom Italia has many ASNs. Is it possible to know for each one "which soil" they ...
user75148
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Does ARP play any role when we try to access a website?
I was looking to find the role of ARP whenever say we want to access a website like google.com. I found some answers here.
But, when I tried to use Wireshark to check the ARP request I wasn't able to ...
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Simple question about NAT [duplicate]
So I am learning about NAT. I understand that it changes IP from public>private and vice versa. From my understanding, when a packet or info gets sent to the public ip towards the private ip, ...
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VPLS over GRE over IPSEC
I need to connect to L2 networks over the internet, which means I'll need some form of security as well.
The first obvious idea is IPSec, but what I'm not sure whether I need GRE over IPSec or simply ...
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Alternative to the Internet for a local network
Suppose we are designing a network and we want to isolate it from the Internet. Are there any alternatives to the Internet for a local network?
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How do ISPs ensure that the IP block that is being advertised to them is valid?
Consider the following situation where we have a customer that is connected to two ISPs for redundancy
Let's say that this customer has its own IP address space that it wants to advertise to those ...
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Interior vs Exterior Gateway Protocols
I'm new to Networking and I was reading about the Interior and Exterior Gateway Protocols ,but i couldn't understand some points , as stated in a reference:
IGPs are designed to work in private ...
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Connect site-to-site private networks [closed]
I used VPN to connect site-to-site private networks from A to B. It worked fine. Then I used NAT for (1) hiding private networks and (2) LAN of 2 sites could access the Internet. The problem is that ...
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Direct connection slower than via switch
My office ISP provides a 1 GBPS connection. When I connect my laptop directly to the router provided by the ISP, and connect to fast.com, I get a speed of approximately 100 mbps.
Our office network is ...
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Internet speed over wifi through walls
I understand that my internet speed over Wi-Fi will deteriorate over distance , especially through walls.
My question is, will speeds drop to a set value, or will it drop as a percentage of the ...
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The relationship between IP address and AS number
I've recently been looking for the IP prefixes originating from a specific AS. And there are a few questions I'd like to get confirmed.
We can register IP addresses and ASN from RIR. But where can we ...
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Example of NCP Address
I'm looking to provide an example of an NCP (Network Control Protocol) address for a scholarly article that I'm writing.
The NCP was the protocol that was used by the ARPANet and which was introduced ...
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Possibility of transferring data over the same-level networks, rather than the higher-level network
This is a silly(maybe interesting) question.
Assume four ASes are connecting to the Tier 1 network(A, B, C and D). B is peering with C and D. A is close to B, but too far from C and D to make peering. ...
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in Twice NAT, why cant external network be advertised to private network?
This is from the NAT RCF:
The following is a description of the properties of realms supported
by Twice-NAT. Network address of hosts in external network are unique
in external networks, but not ...
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Network Oversubscription
I am just joining my firm, and there is already an issue I am taking a look at. I am not part of the networking team but want to contribute as much as I am able.
Our firm is experiencing a drastic ...
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Slow internet throughput if servers are connected on 10G. But good when on 1G?
In our datacenter I'm having throughput issues if a server is connected on a 10G port on the switch. For debugging I already removed our router and asked our ISP for a small IP range that I can use ...
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How do ISPs detect different types of traffic for varying QoS?
When I was looking into the use of CoS (Class of Service) bits, I came across a lot of articles which said that it was used to mark different types of traffic and offer varying quality of service. For ...
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Public IP / IP Transit / IP Peering / ASN / Internet Exchange
I am trying to understand the relationship between IP Transit / Peering and having our range of IP
If i subscribed to an ISP internet service and the IP range is allocated by the ISP - it is consider ...
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Made a VLAN on the switch. How to distribute the Internet to it? Is a bridge necessary or how is it done? (CLI interface)
Is a bridge necessary or how is it done?
I work through the CLI interface.
There is VLAN "X" (with internet). You need to give the Internet to the newly created VLAN "Y".
Layer 3 ...
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where is the local resolver? [closed]
I'm looking into dns cache poisoning and I was confused as to where the local resolver was located.
From what I understand the local resolver is located in a DNS server where we perform lookups when ...
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How does providing IPv4 occur through mobile internet?
I've read that there are 2 types of IPv4 addresses: public ip-address and private ip-address.
Public ip is used to connect devices to the internet (WAN). There's always an example about routers that ...
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Does socket address include transport protocol (http://)? [closed]
Let's say I have the following: http://ip_addr:port
This is supposedly called the socket address (see sources below), but I can't find a conclusive answer anywhere if the transport protocol (http://) ...
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Switching Internet connection on Cisco ASA
I use Cisco ASA in branches of our organization. Each device has an IPsec tunnel that connects to the main office. To access the global network each device also has a NAT. Recently, a task arose to ...
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Mobile cellular Networks (GSM, LTE, 5G, ...) and MAC addresses
We've been provided with a new firmware for our telematics units, which connects to the Internet via a VPN provided by a mobile carrier; since this new firmware release, we've noticed that each and ...
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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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How can I set up two sub networks that can communicate by LAN but where only one has internet? [closed]
With only two routers, where one has a connection to the internet, is it possible to set up a second sub network that has no access to the internet, but where devices connected to either router can ...
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How do internet backbones (and their terminations) work? [closed]
If I establish a TCP connection between a web browser in an Australian household laptop, and a web server in a US data centre, what chain of physical hardware will the signal be sent through?
For ...
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Does a receiver send acknowledgements after data received/failed in a bus topology and in ring topology? If so, how?
if in a bus or ring topology, is there any acknowledgement or error mechanism that if a packet is sent/or failed to receive/lost.
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How do networks duplicate packets en route
I am sorry if this isn't a great place to ask this but I'm not sure which stackexchange to use. I'm not a network engineer but I am curious about one aspect of how the internet functions but I can't ...
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Can Vendor User Mac Address of Another?
I heard that each vendor is given a specific start in the Mac Address to use.
What's the problem of me creating a company and using the start of Mac Address given to google or Cisco? how is this ...
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Cisco 800 Series how Access VLan ISP?
i have a ISP that provide Internet by Vlan and static Ip :
ip XXXXXXXX
netmask 255.255.255.248 (/29)
gateway YYYYYYYY
with microtick i can get it work, but with a Cisco 800 Series dont.
how can i ...
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How to create an internet protocol like HTTPS? [closed]
If I want to create my own internet protocol, what should I do? How can I create it?
Will people be able to use my protocol in their internet browsers? I asked this question in a simple Discord server ...
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Does UDP's lack of congestion control clog up the Internet?
I'm reading Computer Networking: A Top-Down Approach, and from what I understand, UDP has no widely adopted mechanism for congestion control like TCP does. Isn't this a problem for the Internet as a ...
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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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Where is CSMA protocol really implemented?
I have multiple questions.
Where is/were CSMA protocol really implemented ? i.e In our computer ? routers ? switch ? or which component ? is is s/w or h/w based ?
Is it still used ? if not, which ...
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How do machines setup a route in a network?
So I have been reading a bit about networking, and I am a bit confused about what exactly happens after domain name resolutions.
Lets say I do a get request to "some.website.com". First, my ...
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Why is Cisco router PPPoE client configuration so complicated? [closed]
In some routers like Ubiquiti's UniFi Security Gateway, when you want to connect to internet via PPPoE, all you have to do is go to the web GUI or controller, go to WAN settings, hit the dropdown ...
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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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How routers route packets to a specific network
As I understand it, routers route packets to a specific network based on network id and of course the network id must be unique on the Internet, now the question is: maybe there are billions of ...
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How are MPLS routers connected to each other?
So MPLS is one of the many ways to connect two or more distant sites. In other words, it is some kind of a "WAN solution".
But what is the "WAN solution" for MPLS?
Take for example ...
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Is this how ATM and SONET work?
This is how I visualize how SONET carry ATM, and how ATM carry IP:
Is my visualization correct?
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What is the maximum number of networks in IPv4?
From my understanding, in IPv4 addressing, the first 2 octets identify the network, meaning 2^16 networks can exist. But that doesn't seem even closly enough as the population in even USA is above 300 ...
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Why do we need ATM if SONET/SDH can carry IP directly?
If SONET/SDH can carry IP, and ATM rides on SONET/SDH, then why do we need to encapsulate IP inside ATM?
That makes "IP over ATM over SONET/SDH". What's its benifit over "IP over SONET/...
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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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IS Network automation kills carries of network Engineers? [closed]
Iam working as network engineer since long time and i enjoying working same . But now i am afraid after listening of network automation .Is network automation kills jobs of network engineer across ...
user73775
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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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