Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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What exactly happens when I enable net.ipv4.ip_forward=1? [closed]

Suppose I have this situation where I wrote a program to poison the ARP cache of 2 devices (let's say A and B), both in the local network to successfully able to MITM from device M. The program runs ...
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UDP Broadcast Packets Lag On Receiving End ESP8266 and Raspberry Pi [closed]

I'm working on a cool lighting project where each person in a group will be wearing string lights that are controlled using an ESP8266 WiFi microcontroller. All of the ESPs connect to an AP created by ...
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Can Windows Server DNS Manager access websites on the internet, or only local records? [closed]

In other words, is the list of records in DNS Manager the entire list, or is this just the extra records defined locally? If so, does it look at this list before searching the internet? From ...
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Can VPN software work without actual "physical" device? [closed]

I am wondering how VPN software works in general. I am a newbie to VPN and I am investigating. To be specific, my company has Pulse Secure VPN and we connect to VPN with Pulse Secure local client ...
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ISP allows me to browse a website but blocks streaming, what is this technique called? [closed]

There's this site where you can talk to strangers online, they have an option to turn your cam on for video chat. However, my ISP block video streaming on this site but allows me to browse the site. I ...
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2answers
30 views

Do segments at the transport layer contain IP information?

I have few questions about how UDP segments at the transport layer works. I read that The transport layer encapsulates the application layer data along with destination IP and destination port ...
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18 views

Cisco ASA 5505 no internet [closed]

I’m new to networking and I’m setting up a home lab and I’m having issues with my ASA 5505 getting internet access. Is there anything wrong with my configuration to stop it from getting connectivity? ...
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HDLC issue with understanding real life application

Trying to understand how hdlc works based on this topology that I created to better visualise my question: I've been reading the Chapter 3 of Wendel Odom book, but not understanding the purpose of ...
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Using epoll() instead of select() in a simple concurretn server program [closed]

I am trying to implement epoll() instead of select() in my concurrent server program. I've been sitting trying to implement it for days, and yet have not achieved the wanted outcome. I am able to ...
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1answer
39 views

What is the reason behind not returning unused IP addresses? [closed]

There are several companies out there with one or more /8 IP addresses, for example: DoD has more than 200 million, HP has one /8 (>16 million), Apple has one /8, General Electric has one /8, IBM ...
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Is fiber to computer(without the use of any other cables in between) possible?? Are any further developments getting carried out towards this goal? [closed]

All of us know well that the fiber to home(FTTH) connections are a trend nowadays. Every nation is planning to replace the existing metal wires with optical fiber cables. But we also see that the ...
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Really new to Networking and wondering how the first 3 octets of 255 is 1 network [duplicate]

Watching this video on subnetting and I am kind of confused as to why the first 3 octets are all counted as one network but the last octet only adding 1 bit to it makes another network entierly. I'm ...
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1answer
38 views

Does a router work both on Layer 2 and Layer 3? [duplicate]

According to TCP/IP model router works at Layer 3. But when data has to be transmitted to different network it is based on IP address but hop-to-hop transmission is based on MAC address. That means ...
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If you create 20 equal length subnets from the network 192.168.10.0 what is the network address of the last subnet? [duplicate]

Note: Last subnet means last of how many you created. It may not be the 20th subnet.
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network IP packet format

i completely understand that why receiver there is 576 bytes but my question is as technology update every after one Minutes then why we can't update that limit [enter link description here][1]
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1answer
67 views

Is really TCP takes 3*RTT time to make a connection?

TCP takes 3 RTT time I have read from one stack overflow answer to make a connection with server. We know that TCP takes triple (Syn, Syn/Ack, Ack) to make a connection by 3-way handshake with server....
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60 views

Connecting switches in daisy chain / ring

I have a network of 15 switches which are all connected together throughout a building (1 per floor) via daisy chain configuration. There is one cat-6 wire between each switch. All switches have ...
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1answer
924 views

What does it mean to “plumb” an IP address?

Plumbing an IP address means what? What are some examples of it?
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What is the significance of subnets in a network interface? [duplicate]

I am struggling to understand how subnets are used in interfaces (ie. virtual interfaces in Linux) I am not asking how subnets are calculated. An interface has an IP address, but it also has a netmask ...
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2answers
132 views

How is P actually chosen in P-persistent CSMA?

I am struggling to understand how the probability value P is chosen for P-persistent CSMA for any particular station, what's the logic behind this.I have read from Wikipedia . P-persistent This ...
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3answers
81 views

Why client will send a RESET when it is closed state?

Suppose I have an TCP state transition diagram. And assume that the last ACK is lost. Then, B will think that A did not receive the FIN and will retransmit the FIN. From B point of view this is the ...
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2answers
352 views

In tunneling, how destination routers identify if a packet is encapsulated?

In tunneling, a packet gets encapsulated in the payload section of another packet. If the router at one end encapsulates the packet, then how the router at another end identifies whether the packet is ...
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1answer
86 views

Are IPv4 type of service and IPv6 traffic class equivalent to each other or is traffic class IPv6 specific? [duplicate]

IPv6 has a traffic class field. According to the specification it is an IPv6 length, out of which first 6 bits are called code point or differential services code point (DSCP) and the last 2 bits are ...
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1answer
76 views

How to tell if an ipv4 address is public or private?

I've read the below thing, in a website. According to standards set forth in Internet Engineering Task Force (IETF) document RFC-1918 , the following IPv4 address ranges are reserved by the IANA for ...
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2answers
1k views

How is UDP used in multimedia system inspite of being connectionless

We know that UDP does not care about segment (packet) in-order and their arrival on the destination.Then how on YouTube or VoIP (skype) are we able to stream videos? If a packets is lost (doesn't ...
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1answer
29 views

How a socks proxy is different from a normal proxy? [closed]

Socks is a protocol that a proxy uses, then it's called socks proxy. A normal proxy may use any other protocol. How a socks proxy is different from other proxies. What are all the unique features of ...
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1answer
37 views

What's the procedure to limit a subnet on a Cisco router from seeing another subnet when both are using NAT?

I have a Cisco 891F router. The internet is hooked up to G8. The student network is Vlan 200, and the Office is Vlan 100. (I know the internet has an internal subnet (192.168.1.5), but that's because ...
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1answer
32 views

IPv4 entries L3 switch

I am preparing the spec for L3 switch. I decided to buy the C9300L series switch, but I found out that the C9300L series has no IPv4 routing table entries. What does that mean? What is the impact of ...
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19 views

What is preamble in ethernet frame and why is it used? [duplicate]

I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean? Also I've seen another definition that preamble gives NIC time to realize a frame is ...
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2answers
184 views

Why can IPv4 and IPv6 use strict source routing(in options field) and flow label respectively inspite of connectionless protocol?

In IPv4 option field one field option is source routing option this means packet will always be routed by router Or not. Packet can also be routed by source such routing is known as source routing. ...
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14 views

Does the OSI model apply anywhere else other than computer networking? [duplicate]

I try to understand the OSI model, more about why it was created and what exactly it tries to achieve. The Wikipedia page says: The Open Systems Interconnection model (OSI model) is a conceptual ...
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1answer
39 views

What exactly defines a WAN?

I've found this question but it doesn't seem to answer my question. What is the "technical" definition of LAN and WAN I know that a Wan consists of more LAN's together and MAN's and it's ...
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1answer
34 views

How Switch knows if the packet reached it's destination?

In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
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1answer
20 views

In PPTP, do encapsulated packets get further encapsulated in Ethernet frames?

I know that for PPP to travel in datalink layer 2 (ethernet) , the ppp frames need to get encapsulated in a ethernet frame , thus PPPoE. Is the same case for PPTP too?
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What really a point to point connection means? [duplicate]

I know that point to point connection is used to directly connect between two nodes without any intermediate. But if we take in our world the internet(WAN) , let's say I want to achieve a point to ...
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1answer
25 views

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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1answer
45 views

How do switches handle network data if the destination computer is powered off in half-way?

Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
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1answer
42 views

Connectivity issues with 127.x.x.x series [closed]

I have a couple of servers with the below config server1: lo: 127.0.0.1/16 scope host eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet ...
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1answer
38 views

Problems with cat 6 cable

Our company have all the networking with cat 5 cables. My problem is: one of our employees bought a cat 6 cable but we don't have any rj 45 for this cable, we only have for the cat 5. I tried so many ...
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1answer
63 views

Does IPv4 of all devices follow this standard xxx.xxx.x.x?

I think the title says it all. I haven't found the answer anywhere else on the internet.
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2answers
118 views

Class D network for multicasting between group

We know Multicasting is defined as a single source sending to multiple recipients on a network when the receiver broadcasts a signal for acceptance. Multicasting has its own Class D IP addressing ...
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2answers
39 views

Can two different LANs be part of the same private network? [duplicate]

If you had two geographically dispersed LANs with public IPs that are in a different subnet range to each other, (one is 154.30.24.x/24, and the other is 134.64.9.x/24) if they were physically or ...
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1answer
44 views

Lan and baseband channel

We know the baseband line at one time send or receive data(half duplex). If more than one host send data at same time may occur collision. In bus topology see the same thing. Inspite this in home, ...
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0answers
14 views

Definition of a socket [duplicate]

I wanted to confirm whether the definition of a socket I've understood in a computer network context is true. A socket is file who is unique and named by local IP,Local port, Foreign IP and foreign ...
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2answers
80 views

What type of network cable is this and will CAT6 provide me any benefit over this?

I have a router configured as access point and connecting to the host router with four wire twisted pair cable which looks like below: I have some doubts regarding this: What type/sub type of this ...
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1answer
46 views

Why is the VPN throughput reduction different when using a cellular network and when using Ethernet? [closed]

I built a VPN server using openvpn as a protocol and measured the throughput between server and client. There are significant throughput reduction at cellular network. Throughput decreased by more ...
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18 views

how does a propagation delay is being considered as part of a nodal delay? [duplicate]

considering the definition of nodal delay, it's the time taken by the network node devices(router, switch, and hub) to process a packet and forward it to the receiver. so propagation delay is a delay ...
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1answer
39 views

What IP addresses are appropriate for a network inside an embedded device? [closed]

I am making an embedded device with two processors, a "gateway" processor which is connected to external ethernet, and a "webServer" processor, which is only connected to the ...
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3answers
347 views

Questions about NAT

So i just started learning about NAT and networking in general. As powerful as this technology may seem, it was specifically made for reducing the amount of IPV4 addresses used throughout the internet,...
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1answer
44 views

protection method that you need to know exact 3 or more ports to access network

long time ago i found an wiki article for method that protect your network from unwanted access. method was something like: attacker need to know 2, 3 or more exact ports which are open to access the ...

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