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Questions tagged [lan]

For questions about Local Area Networks (LANs).

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Cisco 3750G alternatives without routing function [on hold]

I need some alternatives for cisco 3750g routable switch. It's kinda expensive, is there anything like cisco 3750g just without routing function? I'm gonna use it for whole building, with 4 floors, +-...
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0answers
14 views

Setting up a LAN using laptop [on hold]

I'll be going to a place that doesn't have internet nor a router at all and I wanted to work on my website which I run using Apache (WAMP). Is there a way I an use my laptop to make a LAN just so the ...
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0answers
23 views

Connect to internal LAN network through VPN [on hold]

I am going to explain what I'm trying to do before I ask for help for the part I'm stuck at. Final application I should be able ssh into (or for now, just be able to ping) the devices in the local ...
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0answers
12 views

Unable to connect ethernet [closed]

I recently moved into a new home. The house already has ethernet ports installed in all rooms so I figured getting my network set up would be easy. But I have spent 3 days trying to figure out this ...
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0answers
8 views

Netsys LAN extender in trunk mode, how to access the MGMT interface [closed]

Hi anyone used Netsys LAN extenders (3020E)? These are modems came in pairs, you can boot them up without configuration and they will act as a LAN wire between buildings; SW1 <-> (LAN) Modem 1 (...
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2answers
66 views

What's the role of Default Gateway?

It acts as the "gateway" to the Internet,but also from what i have read,it's the last thing a packet would be sent to while trying to route (when checking the senders' route table). Maybe it's the ...
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0answers
17 views

DHCP Broadcast messages [duplicate]

Why are there so many DHCP broadcast messages while trying to give a computer some network settings? 2.Last,when can these broadcasts be avoided and how are DHCP relay agents related to the whole ...
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1answer
38 views

Access to a server behind the SonicWall from the LAN using Public IP addresses

We have a SonicWall TZ 400 with a Comcast Modem in Bridge Mode. Everything works fine, except the fact that the exposed services on the LAN couldn´t be reached using the public IP of the WAN from the ...
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1answer
35 views

How can I configure link aggregation/bonded LAN for my simple Ubuntu router build? [closed]

I'm spinning out on this one...! Someone please help! I followed this fab tutorial below to make my own Ubuntu based router: How to build a simple router Ubuntu Server 18.04 Which works great using ...
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2answers
32 views

LANs with no router,just a switch(or hub)

Can a LAN be implemented just with a switch? If so,how is the communication completed?just by MAC addresses? When sending a frame from the source to the destination,and inbetween there is a switch,...
4
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1answer
68 views

Industrial machines lose connectivity when one is powered off

I am working with 2 identical industrial machines with multiple Ethernet switches per machine. The basic layout looks like this: Switch 1 Machine A -> Switch 2 Machine A -> Switch 4 Machine A ...
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1answer
32 views

How does a router forward datagrams from the internet to an interface of a private network?

As I have seen in How does a router know to which PC in a network to send a response from a server? if I haven't misunderstood it, if an interface in a private network sends a Datagram to the outside ...
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3answers
503 views

Basic networking and DHCP theory

Background We're organizing an event where we need to connect about 10 PCs into a single LAN network (no internet access). We've got some general experience with "home" and "web" networking but we've ...
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1answer
17 views

Decentralized instance communication [closed]

I intend to build an application that will run on several devices and its main task is storing and presenting data. This application will be deployed to several devices. These various instances should ...
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2answers
256 views

How to force users on my LAN to use a specific DNS server using ARP poisoning?

I'm attempting to force all hosts on my LAN to use a specific DNS server to filter certain material, however I'm running into problems. I've had problems in the past trying to configure my router's ...
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2answers
37 views

How can a public DNS server know the hostname of a machine on a private network [closed]

Example: a home LAN a simple SOHO router (both DHCP and DNS server at 192.168.1.1) 2 client machines (192.168.1.2 and 192.168.1.3) Is it possible for the Google public DNS server located at 8.8.8.8 (...
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2answers
134 views

How does WAN work?

I understand the basics. WAN is a network that connects multiple LANs together. Usually the router is the connection between the LAN and WAN. But I have some questions books and the internet could not ...
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2answers
71 views

What Are LAN technologies?

I know about different LAN topologies(like star, bus, ring,...) and that Ethernet is one of the ways to practically implement wired LANs. I wonder what other technologies exist to make LANs? And, is ...
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3answers
68 views

Pinging computer on a local wireless network, what exactly happens?

I'm trying to get a better understanding of networking in general. Here's one of the many questions I got: What exactly happens (network wise) when I ping 192.168.0.5 from 192.168.0.3, when both are ...
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4answers
3k views

What is the difference between DHCP and NAT?

Both seem the same to me. I don't see how DHCP is different from Dynamic NAT. Can anyone please help?
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1answer
224 views

Why am I getting different public ip from two computers on the same local network [closed]

This is a network setup in a lab of academic institution PC1: Connected to wired LAN socket of Lab. Connection is DHCP. IP: 10.21.106.221 Netmask: 255.255.252.0 Default Route: 10.21.107.254 ...
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4answers
669 views

What is the purpose of 3 or more LAN ports on routers?

what is the typical purpose of 3 LAN ports on a router ? What kind of usage require more than 3 ports ? Are LAN ports on routers similar to the capability of a managed switch ?
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1answer
148 views

connect two routers each one with a LAN with a cable (no internet)

i want to connect two LANs, each one has a router, to allow pc's to communicate between the two LANs without internet. i am a complete beginner in networking and i need to make this project urgently. ...
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1answer
68 views

Compatibility of CentreCom Transceiver 210TS 10BaseT Ethernet with modern Ethernet

I have two old legacy system communicating each other using CentreCom 210TS 10BaseT Ethernet Transceiver. The Transceivers are connected to AUI port of system. SQE test is disable on both transceiver. ...
2
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1answer
35 views

Creating bandwidth with multiple WAN and LAN ports

I have a network with roughly 50 machines all on one LAN, consisting of Linux, Windows, and server machines. I have an untangled u150 firewall/router. I have the ability to add an additional WAN &...
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1answer
389 views

Maximum no of Host's possible in private network on class wise? [duplicate]

my query is that what is the maximum no of host's are possible for Private network in class wise. i.e i want to know No of Private host's in CLASS A,B,C? how to calculate these no?
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7answers
3k views

How LAN works in video games if only one station is permitted to transmit?

I've read the in a LAN the data is transmitted in packets so as to allow only one station to transmit at a given time, so how could this be applied in video games LAN parties if only one device is ...
4
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2answers
979 views

How does Ethernet Switch ensures the validity of the MAC address table?

Let us say I have switch S with 4 ports, PA, PB, PC, and PD, to which I have connected 4 hosts, A, B, C and D with the MAC addresses AA:AA:AA:AA:AA:AA, BB:BB:BB:BB:BB:BB, CC:CC:CC:CC:CC:CC and DD:DD:...
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3answers
1k views

How is data sent from multiple different sources (computers) to the same destination host (computer) on a local network is handled by switch?

Let us say I have switch S, to which I have connected 4 hosts (A, B, C and D). Now let us say hosts A and B both want to send a series of data to the same host D at the same time. So here, A and B are ...
3
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1answer
205 views

Change of IP address range

As part of a corporate project, I am responsible for changing the IP address range of remote sites. I will show you a theoretical scheme of the network and explain the details of the migration. My ...
2
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1answer
53 views

What does a LAN switch do if hosts are/are not in the same LAN?

If some host sends a frame to another one that is not in the same LAN, a the frame arrives to a LAN switch, what does it do? I believe it would broadcast it, but I'm not sure about it. And what if ...
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1answer
74 views

How to prevent getting other machine traffic in LAN on interface

I capture traffic of VMware machine in LAN (host pc is in LAN) with Wireshark. But I see a lot of garbage traffic like LLMNR, NBNS, STP, ... . I know I cat prevent capturing such traffic by using ...
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3answers
1k views

Error Detection across OSI layers confusion

Confusion: How does the transmitter know that his information( bits in physical layer, frames in data link layer, packet in network layer ) was transmitted correctly to the receiver? I know that in ...
2
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5answers
96 views

How 2 computers with different speeds communicate

This is one extremely basic and probably equally dumb question that I just couldn't ever find a definite answer to. Suppose we have 2 computers one that can transmit data at say 10 bits per second (A)...
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8answers
3k views

Can Ethernet frames only be transmitted in a LAN?

In the LAN depicted in the picture below, am I correct in saying that devices do not have IP addresses? There is no router and also only Ethernet frames (with source and destination mac address would ...
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2answers
410 views

Collision domain in full duplex mode switch

In my understanding switch can operate in half duplex or in full duplex mode. In half-duplex mode only one wire pair is used, but in full duplex mode two wire pairs are used. In half duplex mode ...
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1answer
349 views

How the two computers are able to ping themselves which are connected to single router but both are in different Network?

I have configured network as shown in figure. as we know that we can't ping computer which is in the other Network without routing protocol. then how I suppose to ping this computer as shown in figure ...
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5answers
1k views

Is a pfSense router w/ a LAN gateway using a /20 bits subnet mask common?

Obviously I'm lacking some networking knowledge, and I wish somebody could help me understand something fishy I found on a pfSense router in an organization yesterday. The pfSense router forces subnet ...
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1answer
68 views

Is it possible to configure router to prioritize “normal” network usage over “torrent” downloads high network usage [closed]

I have a typical problem of having a shared connection with many people. The connection provided by my ISP is good enough to service many people (50mbs). However, every now and then, when someone ...
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1answer
164 views

Cisco: How Do I Remove a LAN Network From a Router?

I know this is probably a simple question, but for some reason I cannot think of a command. I am using RIPv2 configuration, and simply need to remove a LAN address from the router. Can anyone give me ...
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2answers
312 views

Does a router divide a LAN into two seperate LANs, or a single LAN with two subnets?

The figure below is part of a networking homework question. The question asks about the source/destination IP and MAC addresses of frames sent throughout the system. My question doesn't touch on that ...
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2answers
721 views

Speed benefits when switching from 1Gb copper LAN to Fiber Optic

We are trying calculate how will the network performance improve when we switch from 1Gb copper LAN to Fiber Optic. We have 5-20 people simultaneously working on a Server via the 1Gb LAN. There are ...
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2answers
926 views

Sending packet through LAN cable to another PC having ip of another network

What happens if, say PC A(192.168.2.2) tries to send a packet to PC B(10.0.2.3) connected through LAN(only 2 computers are connected in this case PC A and PC B) as there is no router or a switch ...
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1answer
51 views

What are connectivity associations in LAN? - IEEE Std 802.1X-2010

In IEEE Std 802.1X-2010, Appendix D, Section D.8, there is the following phrase However simple or complex, the establishment of a connectivity association for connectionless data transfer ...
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1answer
245 views

what is POOl in lease line i got 30 wan [duplicate]

Please help me Proposed IP Pool WAN/30 & LAN/29 what is the meaning how computers usable for this connection.this lease line connection optical fiber
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1answer
59 views

Do packets take the same amount of time when they are within the MTU?

Without considering application processing or deep packet inspection, do packets that do not fragment all travel through the network at the same speed? For example, if there is a network with an MTU ...
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2answers
737 views

Finding the optimum root bridge for a spanning tree

The spanning tree protocol uses the bridge ID and the MAC address of the switch to elect the root bridge. After the election process, a spanning tree is created, preventing switching loops by ...
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3answers
1k views

Calculate max transfer speed in LAN network

We have a LAN network between consumers and producers servers. Producers' output path has been mounted in consumers. There is a 10 Gig switch between producers and consumers and the link between each ...
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1answer
3k views

Get MAC address of all devices (IP cameras) connected to switch

I am a beginner when it comes to networking, and I have done as much research as I can to try and figure this out on my own, but the more I read the more I realize I don't know. I work for a ...
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3answers
113 views

Are there any advantages in using optic fiber to connect a host computer to an ethernet LAN?

I saw that computer Network Interface Cards (NICs) that use fiber ports (SFP) instead of RJ-45 ports and I wonder if there would be any significant advantage in connecting the computers directly ...