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.

Filter by
Sorted by
Tagged with
0
votes
0answers
6 views

Regular connection failure for 3 seconds (Windows 10) [closed]

I am getting regular network connection failures every 30 minutes or so for 3 seconds. Ping to 8.8.8.8 looks like this: I've been experiencing this for the last 2 weeks and I can't remember doing ...
0
votes
0answers
22 views

Types of ARP messages [duplicate]

I have a little misunderstanding which message type the ARP protocol supports. From this link we can see that the ARP header consists of these fields: Hardware Type–It is 1 for Ethernet. Protocol ...
0
votes
1answer
37 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 ...
0
votes
0answers
17 views

How to access all devices on remote network via VPN? [closed]

I am planning to build a home lab. DESCRIPTION: My goal is to be able to access to my homelab from a remote pc (as my laptop). This is what I have in mind. In order to secure the access from the ...
-1
votes
0answers
9 views

Use Macbook to Connect to Home Desktop [closed]

I recently bought a macbook for university, as I am working on a laravel project I would like to leave my computer at home running the project and be abble connect to it and be able to work on it at ...
0
votes
1answer
19 views

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 ...
0
votes
2answers
56 views

what is the main function of root bridge and ring master?

When we learn the STP or RSTP,we all learn the election of root bridge, the lowest priority number or MAC address of switch will become the root bridge.So here is my first question: 1.So what can the ...
0
votes
0answers
14 views

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 ...
0
votes
1answer
30 views

Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
0
votes
1answer
33 views

If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology,combined with 8 Hubs and 2 switches,i want to ask two questions 1. If H3 is damage,but the fiber is still ok,will H2 damage too in the future? i have a thinking to ...
0
votes
1answer
49 views

questions about queuing delay

I am learning computer network, and confused by the queuing delay. In my textbook, it says that when La/R approaches 1, and with random inter-arrival times, then the average queuing delay is closer to ...
0
votes
2answers
61 views

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]
2
votes
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 ...
0
votes
1answer
71 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 ...
0
votes
1answer
54 views

What defines a device as connected to the Internet? [closed]

I recently saw a SO question: Are there global networks other than the Internet? I am aware of other networks such as ATM and the telephone network, which are not part of the Internet. My question is, ...
0
votes
1answer
41 views

Understanding the definition of layer 2

The Wikipedia (and other sources) page about the OSI model explains layer 2 as such: The data link layer provides node-to-node data transfer—a link between two directly connected nodes. ... Let's ...
-1
votes
2answers
57 views

why can't my PCs ping each other?

Consider the following network I can ping just fine from PC0 to PC1 and PC2 to PC3, but I can't ping from PC2 to PC1 or PC3 to PC0. Why? I'll share the configuration from the router: Building ...
0
votes
0answers
9 views

What exactly SLIP is (was) used for? [duplicate]

I try to understand what scenario exactly did the SLIP protocol (and its successor PPP) is aimed to address. Let's start with describing a modern network system, and help me figure out where SLIP used ...
0
votes
1answer
36 views

What is the addressing problem of SLIP? [closed]

In the RFC1055 that describes SLIP, in the DEFICIENCIES section, there is a bullet named "addressing" which says: both computers in a SLIP link need to know each other's IP addresses for ...
1
vote
0answers
17 views

my pfsense is reducing the speed to 40 mbps from 300+ mbps, what can be the issue? [closed]

I have a pfsense system BUSINESS B100 - CELERON DUAL CORE J1800 2.41GHZ 4GB DDR3 SODIMM SSD 60GB HDMI. https://www.amazon.com.br/gp/product/B086M2D8DJ/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&...
0
votes
1answer
24 views

Does creating frames done by device drivers?

If I got it right, TCP and IP packets are created normally by software running in the kernel. So when I as a user open up a socket of type TCP/IP and send a message, the kernel takes care of all those ...
5
votes
3answers
2k views

Why can PPPoE connect to a gateway which is not in the same subnet

We know the host needs to be within the same subnet as its gateway for the routing. However in PPPoE, the public IP has a 255.255.255.255 subnet mask, it means that the IP is not in the same subnet as ...
3
votes
1answer
73 views

why can a router make two PCs in different subnets access each other?

Case 1: PC A: 192.168.1.2 / 24, and it connects to LAN port1 of router A PC B: 192.168.2.3 / 24, and it connects to LAN port2 of router A Given above we know A and B can't talk to each other due to ...
2
votes
2answers
54 views

Can I backup config of an EdgeRouter Lite 3 to an EdgeRouter 4?

After having worked 6 years and 24/7, my EdgeRouter Lite 3 have definitely died. I want to replace it by a new EdgeRouter 4. Can I easily use my EdgeRouter Lite 3 backup files and import it to a new ...
1
vote
3answers
135 views

Router interface on same subnet

Could someone please explain why can't be have 2 interface on same subnet? Do router use network address to forward traffic?
1
vote
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 ...
0
votes
0answers
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 ...
0
votes
0answers
20 views

What is the goal of the OSI model? [duplicate]

I'm currently learning about the OSI model, trying to understand exactly what it is and what is the purpose behind it. The Wikipedia page says: The Open Systems Interconnection model (OSI model) is a ...
1
vote
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 ...
1
vote
1answer
33 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 ...
1
vote
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?
0
votes
0answers
18 views

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 ...
1
vote
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.
1
vote
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, ...
0
votes
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 ...
0
votes
2answers
56 views

Are duplicate sequence numbers from different TCP-connections possible?

While learning about Sequence and Acknowledgment numbers one thing bugged me. I wasn't able to rule out for myself if the following scenario in which Host A sends data to Host B by using some ...
0
votes
0answers
7 views

im having trouble understanding subnets. I want to set up two subnets. net 1, net 2. net 2 can see net 1, net 1 should not see net 2 [duplicate]

I tried doing this by changing the mask, but now that I think about it broadcast would be different for each net. So to clearify net 1 devices can talk to each other but not net 2, net 2 devices can ...
0
votes
0answers
13 views

Why do we need Layer 3 logic to communicate to other networks? [duplicate]

My knowledge about networking is a bit rusty and as I am watching and learning about networking, TCP/IP and potentially get a CCNA/CCNP certification a thought crossed my mind: I keep seeing (simple, ...
0
votes
1answer
34 views

My laptop not comes on the network when connected to cisco 2951 routing port, so it does not ping [closed]

I have assigned 192.168.1.2/24 IP to laptop with 192.168.1.1 gateway. This gateway is actually the IP address of the Cisco 2951 router port. But my laptop doesn't come in the network that's why it ...
1
vote
4answers
95 views

IPv6 addresses plan and allocation

I read at several places that ISPs should allocate a /48 (or /56) IPv6 addresses blocks to end users Wikipedia for instance The RIRs assign smaller blocks to local Internet registries that ...
0
votes
1answer
18 views

Achieving clock synchronization via 1588V2

Is it possible to achieve frequency synchronization between 2 network points (not TOD but actual frequency) - by using 1588V2 alone ? Or do we have to use SyncE for that ?
2
votes
1answer
75 views

iSCSI with dedicated switches

Looking to purchase some dedicated 10GB switches for our iSCSI setup. Would the following setup allow us to use two switches for redundancy? Two VMWare ESXi hosts, each with 2 10GB NIC Storage with 2 ...
0
votes
0answers
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 ...
0
votes
2answers
61 views

Do domains frequently change their IP addresses

I have the domain of some organization that requests my site too much. I want to restrict their access - but how? We only have the domain of the requester sfasu.edu . The QA of our team is using tool ...
0
votes
2answers
21 views

How an intranet can be invisible to the IP module if the IP module allows a non-networked device connect to a network system?

A quote from RFC 791 document "Fragmentation, transmission and reassembly across a local network which is invisible to the internet protocol module is called intranet fragmentation and may be ...
0
votes
0answers
9 views

Finding IP address [duplicate]

I have a device (logger for data acquisition), ut seems that someone has changed it's default IP address and lost it. I can't access it. Is there's a way to find it's IP?
3
votes
4answers
183 views

Question about ARP requests

When a device tries to associate an IP address with a MAC address for a given device, it sends ARP requests to all devices connected to the same network. If I understand correctly, the searching ...
0
votes
1answer
33 views

public ip over private lease line

I have a private cross-connection with a service provider This private connection is connected from my firewall to their router and the L3 IP range /30 for this segment is private However, i just ...
0
votes
1answer
58 views

Is it possible to move a persistent TCP connection?

Context: Say I have a global cloud service. In each datacenter, I have numerous persistent TCP connections to various client devices. The TCP connections are distributed across various nodes in the ...
0
votes
1answer
44 views

How does a device on one network connect to with a device on another network

So if i have two routers and each router has lets say 2-3 computer devices.I am connected to the 1st router. So if i want to connect from my device to a device on the 2nd router than I will send the ...

1
2 3 4 5
14