Questions tagged [network]

For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.

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About accept() function [closed]

When we call the function of accept, accept function will be blocked until getting the request from a user. My question is that how accept() is works? how OS wait until getting a request? Two ...
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Understanding TCP congestion control

Why is the congestion avoidance here [6,14] and [18,25]. Why not [6-10] and [18-22]? Other examples I have seen online suggest otherwise: For example here: https://www.researchgate.net/figure/TCP-...
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Solution to get a cable connection without passing cables throw the wall [closed]

I have a fiber link comming to my apartment, connecting to the "fiber reader" (i didnt really know the name of that) and connecting to a wifi router. Problem is, my laptop had a crap wifi receiver, ...
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How should I set up a network in an old mutliple floor building? [closed]

I recently moved into an old house. Were the internet is suboptimal. Right now it looks something like this: The Coaxial cable from the provider goes into the Provider Router in the basement. Then ...
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25 views

VPN - help to building VPN networks [closed]

I am at the stage of designing a VPN network. Unfortunately, I have no experience in this type of installation, which is why I would like someone to help me, or at least direct me. I am currently ...
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12 views

Pc components, including router. Which component stores information [closed]

This just for personal interests, let's assume I want to investigate a case as a police officer. I wonder from a technical perspective which Pc components save memory. (Including the router) Using ...
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6 views

Turtorials for building a computer cluster [closed]

I am completely new to Linux and networking and need some starting tips. For a project I want to use 5 (later more) old PC's of the same type, which I want to interconnect, to use them as one unit. ...
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13 views

Making our DNS resolving / recursion more resilient and more private [closed]

We want to make our DNS resolving more resilient, independent and less susceptible to spying by tech giants/ISPs by setting up our own DNS recursor. The DNS infrastructure is known to be one of the ...
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15 views

TCP connection closes instantly (without timeout) when I change my IP address through the windows network and sharing center [closed]

I have tcp connection to some tcp server on internet. Tcp client is a simple application that I have created which works on my computer. The problem is that when I change my ip address through the ...
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15 views

Finding file transfer overhead [closed]

If this is not the right thread for this question, please bear with me and suggest the better one. So basically I'm trying to setup an experiment to estimate a data transfer overhead through an ...
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What benefits does a non-persistent HTTP connection? [closed]

My Question is rather short. What benefits does a non-persistent HTTP connection. And on what conditions would someone implement it over persistent HTTP? Thanks
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does my traffic go through ssl vpn while I am connecting to browser based vpn [closed]

due to the coronavirus, we started the work from home, so we connect to the company by SSL-VPN my question is what if I connected to this SSL-VPN and then I connected to browser-based VPN (like ...
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Steam P2P, SoftEther VPN and other issues when using a router in school network [closed]

I am currently living in my university dormitory. The school provides one LAN port per person, however there is no Wi-Fi access in the dorms, so the school allows us to use a wireless router on the ...
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7 views

Assume that we use Selective Repeat algorithm with window size N=6 to transfer the file from [closed]

Question: Assume that we use Selective Repeat algorithm with window size N=6 to transfer the file from size 9. The losses occur where data segment 5 and ACK segment 3 are sent on their first ...
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How does a packet go from my computer to a server for example Google, in the first person perspective of the packet? [closed]

So, take for example my home network. It consists of 4 computers connected to a switch, which is connected to a router, which is connected to the modem to ISP. Correct me if I'm wrong, the router ...
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1answer
74 views

Latency of 10G fiber SFP+

I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire ...
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9 views

Header Size of Sigfox packet

I am trying to find the header size range for a Sigfox packet and I can't seem to find it anywhere. I have looked on the Sigfox website and it says that the maximum payload is 12 bytes but it says ...
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3answers
28 views

Can two or more computers that are physically close together form a connection/network without a router? If they can, how do they do so?

So, I am pretty familiar with things when a router is used. To my knowledge, packets travel from Computer A to the router, then the router directs it to Computer B. Problem solved. I get confused when ...
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1answer
24 views

Will arp table on the host (linux) will refresh after no of failure?

Let say I have a remote hostA and remote hostB. Initially hostA has an IP address of ADDR1 and hostB has an IP address of ADDR2. Now clientA made a successful connection with hostA using ADDR1. ...
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14 views

what is role-based source authentication network misconfiguration mean?

what is role-based source authentication misconfiguration mean? in a Context of SDN where i have assigned priority to a candidate flow rule , recognized 3 standard authorization levels among flow ...
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1answer
29 views

What would the bandwidth be while transferring from a machine with a 2.5 Gbps NIC to a machine with a 10 Gbps NIC?

I have two machines connected via a managed network switch capable of supporting 10 Gbps bandwidth. What would the bandwidth be if I transfer data from machine 1 with a 2.5 Gbps network card to ...
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1answer
51 views

Are subdomain and subnetting related concepts?

Recently while trying to grasp some basic networking concepts - I felt subdomain and subnetting are related concepts and wanted this group to confirm and add more insights on this. I understand that ...
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1answer
27 views

How are the rules in a network protocol defined? [closed]

New to network protocols here. Everywhere I read about network protocols it keeps claiming that they are simply just some rules and guidelines that allow computers to link to networks - but how is ...
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1answer
36 views

Why does Network address translation (NAT) need Port Address Translation (PAT) if IPs are different in the internal network?

For example, there are several servers in the local network 192.168.0.1, 192.168.0.2, 192.168.0.3, etc. They are connected to one public IP. Why does NAT also assign ports to each local IPs that are ...
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4answers
59 views

P2P Connections

Hey there I am a noob in the field of networking and I have a confusion: What is the difference between point-to-point and end-to-end connection ?
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1answer
23 views

Segregated network - managed switch or router?

I have 3 pc connected to a switch that is connected to a bigger network. I want those pc to live in their network and don't expose their ips. (in this very moment the scope is accomplished using a pc ...
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1answer
33 views

Significance of UTP / FTP in relation to keystone connectors

Whilst I am aware of what F/FTP, and the like, means in relation to cabling, I am a bit nonplussed as to the significance when applied to a keystone connector. To my understanding, if a keystone ...
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1answer
21 views

Passing network bonding to other port [closed]

I currently developing network for office place using mikrotik cloud core router, the outline is 2 ether interface into 1 bonding interface and distributing into 2 ether interface or maybe 1 ether ...
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2answers
61 views

Point to point link with two Internet connections

Thank you in advance for reading this question. I have two buildings, let's say A and B, each connected to the Internet. Devices in A also need to access devices in B and vice-versa. The Internet ...
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2answers
319 views

Why the network switch drop the frame acording to ethertype/length?

I have a network switch IC , and I am using to the send BPDU packet. I can send packet with 2 byte ethertype/length field like this : 81 00, 80 00, 91 00 and some special hex number. But if I try to ...
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0answers
31 views

Why do corporate networks prefer application-level over network-level proxies? [closed]

I was recently using an application at work, which was unable to download needed files because proxy settings were not configured for the application. The company firewall blocks non-proxy connections....
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1answer
24 views

ASA shows Action:Drop on packet-tracer, no reason or phase

I am doing a very simple lab with one asa and two computers. PC1 connected to dms PC2 connected to outside : Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores) : ASA ...
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1answer
47 views

Campus Area Network Deisgn [closed]

I have 10 buildings in a campus and I want to design a Network. The design should follow the three layered hierarchical model. Below is my design, I just want to know if the design will work just fine ...
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1answer
87 views

Symmetric routing and asymmetric routing plz elaborate

First of all thanks, Am pretty much confused this both term of routing read blog's and notes but still kinda confused.
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1answer
28 views

PoE only data and power over network

Is ethernet(PoE) the only (power and data) over the network. I did google this I'm dyslexic and dysgraphic so English I tryed
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1answer
46 views

What is underlay and overlay network?

Curios to know about underlay and overlay networks and differences between them.
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3answers
43 views

Can odd or even parity correct errors

Can odd or even parity correct errors? Odd or even parity can be used to detect errors. Can it correct errors?
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Given a subnet mask, how can I determine which addresses can be assigned to public network hosts? [duplicate]

For example, I'm given a subnet mask of 255.255.255.248 and need to determine from a list - 16.70.118.63 134.178.18.56 200.47.224.159 68.111.178.93 192.168.16.87 217.37.10.192 - which addresses can be ...
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3answers
2k views

What is the least possible separation of two NICs with the same MAC address?

Suppose you have two NICs with the same MAC address, but not necessarily the same IP address. What is the least possible separation (in terms of number of switches, routers, different IP subnets etc.) ...
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1answer
30 views

Unable to receive logs from a device to our SIEM Syslog server via TCP 514 [closed]

I want to collect logs from a security device (McAfee Email Gateway) to our SIEM Syslog server. This security device can forward logs only via TCP syslog on any port (in our case it is 514). We are ...
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1answer
57 views

Cisco ASA5585-X replace SSP-20 with SSP-60

We have cisco ASA5585-X with SSP-20 running in production and we need more power so planning to replace SSP-20 with SSP-60 module but not sure we can just hot swap with SSP-20? Does ASA5585-X support ...
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1answer
36 views

How does triple handshake avoid establishing connection for duplicate packets(coming later down the line)

The idea behind triple handshake seems to be for duplicates to not cause issues. The way I understand it host sends a sequence x to server. Server acknowledges it and sends it's own sequence y. Host ...
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1answer
37 views

Why do we need machine learning for QoS classification in SDNs if we have DSCP in IP address for QoS enforcement?

DiffServ (Differentiated services) uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. If ...
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2answers
227 views

Internetworking packet transfer

What happens when a packet gets lost or corrupted? Mostly flow control is in the data link layer with acknowledgements. Does this happen on network layer as well like among multiple networks. A packet ...
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2answers
56 views

Why is there a need for a MAC address on top of IP address? [duplicate]

The way I understand is that MAC address uniquely identifies a NIC on a global level. IP addresses do not because they may go through a NAT box and the ISP may issue a single external IP address for a ...
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13 views

Building simple network configuration [duplicate]

For the below network configuration I need to propose an IP addresses, netmask and anything else obvious that I am possibly forgetting. The network is built of four Computers, Router and a Switch. I ...
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3answers
2k views

Why can a host with a single NIC and on two networks have 2 IP adresses?

I understand that an IP adress refers to a NIC and not to a host, therefore a single host can have as many IP adresses as NICs. But Tannenbaum says: It really refers to a network interface, so if ...
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1answer
35 views

Can Northbound interfaces (REST API) in a Software Defined Network (SDN) be used to manipulate QoS parameters?

I am working on a project involving Quality of Service (QoS) manipulation in Software Defined Networks (SDNs). I know that the following parameters affect the QoS in an SDN: Time information (inter-...
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1answer
40 views

How a wireless access point reads all the available SSIDs

When a wireless access point is broadcasting its SSID (beacon frame) I assume it sends it on specific selected channel (channel 1-14 for 2.4 GHz network). But how do all the other access point ...
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13 views

Which mask to use for 1024 address size subnet [duplicate]

I am trying to identify if given IPs are from same 1024 SUBNET. 192.168.3.1 192.168.2.19 192.168.1.1 The part I got stuck is that SUBNET address size is 1024. If I am sure, by checking IP addresses ...

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