Questions tagged [internet]
For questions about interconnected networks.
325
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Can SPF, DKIM and DMARC rule out the possibility that an email sent is not a spoofed email? [closed]
Excuse my ignorance. I'm just a beginner trying to fill in the knowledge gaps that I have on how email system in general works, so this might seem a silly question to some or even all of you.
Is there ...
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How to set up a MoCa adapter on a home network with Bell internet? [closed]
I have a new house and I want to set up a MoCa adapter for fast internet but need some guidance. Some facts about the house that I noticed.
There are 4 coaxial ports around the house. 1 in basement, ...
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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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27
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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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102
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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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3
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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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97
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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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47
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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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102
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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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What is "TIME_WAIT" connection in a TCP connection and what is it's purpose?
I am requesting a webpage running on local server port 8080 and was expecting one connection to be established between the server (port 8080) and client (random port). But one additional port is also ...
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2 AS in the same box JunOS
Today we have an MX204 and we announced our AS using Juniper, but we also have partnership with another internet provider that has another AS. This other AS has much less client and a much smaller ...
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Why is the Internet not hierarchically addressed? [duplicate]
IANA is recognized as an authority on global IP address allocation. See Wikipedia, or ietf.org, IANAs website, or Google it. They state that "both IPv4 and IPv6 addresses are generally assigned ...
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Routing with private addresses
Let's say that we have a private network, with private addresses and a NAT enabled router at the end. If the router is misconfigured and routes traffic to the global internet, keeping as source ...
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What role is ARP playing for a internet request?
For me it is not clear how the internet is working. Let's say we have host (local IP:192.168.12) and the gateway/router (local IP: 192.168.0.1 / extern IP: 62.1.2.134)
Now the client (192.168.0.12) ...
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Is not 192.168.88.1 (192.168.*.*) always an "internal" IP address?
I had some headache with a proxy setup which I couldn't figure out. Turns out that only "127.0.0.1" and "localhost" were recognized as "localhost" or "internal" ...
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What is an acceptable loss with external networks? [closed]
Based on my reading here, any traffic loss on the internal network should be quickly addressed. However what is an acceptable level of loss one can expect when communicating with external networks? ...
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Why does SONET need atomic clock but T-carrier does not?
SONET and T-carrier are both synchronous TDM.
But T-carrier does not use atomic clock. Why does SONET?
Is it because SONET does not use buffer? But how does it prevent bit loss if there is no ...
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Why is the IPv6 address I'm getting from whatismyipaddress.com wrong? [duplicate]
So I've portforwarded my machine using the graphical interface provided by my router. This interface also gives me a public IPv6 which I can use to communicate with my machine through the internet. ...
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Vxlan with internet access - possible because of high MTU?
So i was wondering, because VXlan requeres a high mtu to work properly (some set it even as high as the max configurable MTU (9000ish)), how would providing internet access for these nodes/servers ...
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Real world IP routing on the Internet [duplicate]
I used to think the Internet looks like a tree, with some extra edges for redundancy. And that the subnets are getting shorter and shorter as you go up towards the backbones, the roots of the "...
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654
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Automatic backup internet connection, is it possible? [closed]
I am trying by best to understand this topic. Apologies if this isn't the correct format or if it's lacking required information, I am little more than a home user. If someone could help point me in ...
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695
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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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filling routing table with next hop addresses
in a multi hop network when the packet leaves the source is it loaded with all the ips of the stops on its journey, then at each hop it checks the bitmask with the nodes routing table to see if this ...
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Speed comparison between agregated and non agregated internet
I have an offer for internet connection, where they offer me these speeds for a symetric and non aggregated connections over fiber optics (upload/download):
10/10 Mbit/s
20/20 Mbit/s
30/30 Mbit/s
...
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Peer-to-Peer (P2P) Networking Decentralization [closed]
How does P2P networking locate peers in the network if there is no centralized point to look up IP addresses of the individual computers in the network. Assuming there was no domain to use to do an ...
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Why can I forward email without mx record set up properly? [closed]
Say I have a domain
domain.com
I do not set anything on mx record in domain.com
Yet I can set a forwarder from say hello@domain.com to another email.
I set a address.
Is this normal?
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