Questions tagged [lan]

For questions about Local Area Networks (LANs).

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1answer
317 views

Etherchannel Basics

Assume we have 2 switches connected back to back with 2 links as shown below: Please see the attached image. In traditional STP environment,one link will be blocked to avoid Layer2 loops. So ...
2
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2answers
2k views

serial Connecting two network wall sockets

First of all, I am not a network engineer, and my knowledge of physical network installations is quite limited ( I am a programmer ) , so please excuse me if my question is too trivial / naive / ...
1
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2answers
79 views

Weird address in my network

I pinged all hosts in my network. Only my PC and my phone are connected to my network. Therefore I received three addresses, not two. This weird one is 192.168.1.1. It isn't neither my PC nor my phone ...
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1answer
98 views

How to setup an static IP in a machine that is DHCP enabled and roaming between different networks? [closed]

First of all I am so sorry that this question might be so rudimentary to ask here but I need to know it. I am connecting my laptop in many wi-fi networks every day while roaming. So my IPv4 is in ...
1
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1answer
60 views

PoE wireless bridge to PoE WAP? [closed]

Do I have this right? Not shown is the Wireless Bridge is aimed at an outdoor WAP across the yard, which is connected to a router, WAN, etc. I just want to see if I have it right on the receiving ...
1
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2answers
8k views

Connect a LAN cable to LAN1 & LAN2

I connected a LAN cable from the LAN-1 port to the LAN-2 port owned by the same router. Then really weird things happened: For 10 - 15 seconds, nothing happened, none of the lights on the modem are ...
0
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1answer
24 views

Unix: using route to define route to a client [closed]

I got the following network topology: client--monitor--controller--Internet Earlier today I had to restart the controller and the client.Now I cannot ping the client from the controller anymore. All ...
1
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1answer
3k views

pfSense join 2 networks

I've got 2 pfsense boxes taking care of separate networks, with separate gateways. We've managed to drop a cable between the 2 networks so would now like to join the 2 networks so machines on each ...
1
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1answer
627 views

VLAN and LAN on the same port

I have an Unifi AP which is capable of making multiple wlans. The AP is connected to a tplink smartswitch from which it gets internet access and sees everything in the network. The switch is connected ...
0
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1answer
65 views

Best way to place a proxy in a network?

Correct me if I am wrong, but in a LAN, when a packet sent by a computer has a destination located in the Internet, it will send it to the gateway (which is a router only right?). Now, I want to ...
0
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2answers
455 views

How to push same configuration lines on to all the routers and switches using any script/tool? [closed]

I wish to a add a couple config lines to all the routers and switches in the network. Instead of longing into each device, can we do this at once using any script or tool? Please note that we require ...
1
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1answer
60 views

Active SC fiber connection not 'turning on' port

Multimode LC connected to Catalyst 2950. Other end of cable connected to Catalyst 2900 Series X 100baseFX connector. When the two switches connect via fiber there seems to be no communication. The ...
3
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2answers
318 views

Ethernet wiring job done wrong

I am a systems administrator by trade. Though I have done a few wiring jobs, this is not a task that I claim to be a professional at, either by training or experience. However, ethernet wiring isn't ...
5
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3answers
19k views

What are the reasons for not putting multiple subnets on the same VLAN?

I would like to know why we do not (and should not I guess) use 2 different networks on the same LAN/vLAN. From what I tried and understood : Host in network A (ex: 10.1.1.0/24) can talk to each ...
1
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1answer
341 views

Broadcast packet in LAN is first sent to router?

Can you confirm that if host 1 wants to send a broadcast packet, he will send it to the router first, and the router will send it to all machines to the LAN ? I need to clarify this point in order ...
8
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3answers
4k views

Why do LANs use MAC addressing instead of IP addressing?

Why do LANs use MAC addressing instead of IP addressing? In other words, why can't a network just assign an IP address to a local area network device and send the data to that, instead of the MAC ...
1
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1answer
497 views

Website not loading/very slow only on a client's netwok [closed]

I really need some help to explain following two scenarios as I only have little network troubleshooting skills. I am supposed to go to these clients and give a valid reason for these issues. The ...
0
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2answers
69 views

Can one WIFI AP affect the others' performance?

In a LAN network with multiple Access Points, if one of them is awful, broken or old, will the others, shiny new and happy, be hurt? Will the entire network be affected somehow by that bad AP?
2
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1answer
348 views

Are there any reasons not to use switched backbone networks?

I'm studying network architecture and after looking into switched backbone networks it looks quite easy to manage and results in higher performance in comparison to other backbone networks. Are there ...
2
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1answer
1k views

How to sniff a switched LAN by plugging the laptop into a switch port

There is a switch-based LAN without encrypted traffic. I want to sniff ALL its traffic (ARP, TCP, ICMP, etc.) by plugging the laptop into one of the switch port. Then run the software on the PC to ...
2
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3answers
744 views

Wired vs Wireless Networks

What we have is a majority cabled network, CAT5e/CAT6 and fibre running at 1Gbps throught. Some wireless access points dot the buildings and supply Wi-Fi to where it is needed. Client now wants to ...
3
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1answer
2k views

Spurious restransmission to a server behind pfsense NAT

i'm trying to connect to my ssh test server that i setup behind a pfsense firewall via nat on port 22. When I sniff packet on my laptop (WAN side of pfsense) trying to connect to the server, SYN is ...
4
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1answer
622 views

Network Diagram for IPv6 LAN

From what I understand about IPv6 networks, since NAT was a hack to deal with a lack of IP addresses in IPv4, NAT is a possibility, but not a requirement in an IPv6 LAN. So taking this into account,...
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2answers
2k views

Using Wireshark to Capture Traffic Between VMs on a Third VM [closed]

I have 3 Ubuntu VMs in VirtualBox. They are in a host-only network (LAN). Now, I turn on the wireshark capturing on VM1, and then on VM2 I ping VM3. I expect to capture the ICMP messages on VM1. ...
5
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2answers
16k views

pfSense 2.3 How to setup each Lan traffic goes only over specific gateway

I am running a pfSense 2.3 box with 4 NICs. Now i have 2 different ISPs (one Cable & one DSL). How Can i configure, that all traffic from LAN1 goes ONLY over WAN1, and all traffic from LAN2 goes ...
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1answer
65 views

Should the native vlan be explicitly declared as an allowed vlan

Should the native vlan be explicitly declared as an allowed vlan for a trunk port or not to send/receive frames of that native vlan.
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1answer
155 views

Capturing network traffic using wireshark [closed]

I have 15 systems connected with same LAN. I want to capture all the data packets(network-traffic) through every system from my single PC connected with same LAN using wireshark.Can anybody plz help ...
0
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1answer
38 views

What decides the Bit Rate on a channel/link?

Could someone please help me with this doubt I have regarding how the Bit Rate is decided for a network/link because for the maximum bit rate one need to be aware of the channel/link bandwidth,right?...
4
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2answers
1k views

Trouble Cascading VLANs Cisco Switches

Desperately I'm trying to cascade two Cisco SG200-26. The use case seems simple: No tagging should be needed, we just want each switch to behave exactly like two small switches. But just when ...
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4answers
799 views

Sniffing a Device's Traffic on LAN

There is a device on my network connected via ethernet. Seeing as how hubs are hard to find or ridiculously expensive these days, what hardware can I use if I'm interested in sniffing the traffic to/...
3
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1answer
3k views

Why can't two computers connected to the same DD WRT router ping eachother? [closed]

Here is some information about my situation. All firewalls have been turned off and everything involved has been restarted multiple times. Client isolation on the router is disabled by default, the ...
1
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1answer
70 views

All to one vs Many to Many

I am setting up our small office of around 30 users, divided into 2 rooms. Plan A: 1x Router 1x 48-port smart switch 2x Wi-Fi APs Room A (10m x 7m) has developers which need 1Gbps link, 17 Users. ...
2
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1answer
179 views

how to identify addresses on an ethernet frame

How can I identify the sender's address, the receiver and what type of message does the frame carry on its payload? The frame looks like this: FF FF FF FF FF FF 08 24 F5 CE D3 AC 08 06 00 01 08 00 ...
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2answers
153 views

How to find the IP adress of computer with which I am sharing the Internet [closed]

I have one router with two PCs connected to it, via a LAN cable. Is there a way for me to find the IP address of the other PC?
2
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1answer
151 views

Switch Trafficking

I'm running a simulation in Riverbed modeler, and I've got two broadcast domains, each having one Ethernet advanced hub and 16 Ethernet advanced stations connected to it through 10Base-T links. ...
1
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1answer
90 views

How to configure persistent routes? [closed]

In my company I have a LAN 192.168.100.0/24. My desktop PC at work has an IP address 192.168.100.100 and LogMeIn IP 25.50.70.30. Only from inside that LAN I can access my server located at 192.168.101....
4
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1answer
81 views

Ensuring Network Stablity

I recently became the IT guy at a remote school with onsite staff. The network setup is a bit messy right now. I am curious about the best standards to use. Below is a map of the current network that ...
6
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4answers
6k views

Why do we use VLAN?

According to my understanding, the network switch will look out for the specific MAC address and then it will forward the frame so basically it doesn't broadcast the frames then why do we make VLANs? ...
2
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4answers
469 views

Collision and Broadcast Domain

The network segment between a router and a switch is considered as a collision domain? or a broadcast domain?
2
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2answers
405 views

What can I do with a crossover ethernet cable?

Is the file sharing of two PCs, connected with a crossover cable, both directions or only one? Would I be able to connect to a PC and play LAN games over this mini-network? Would this be extremely ...
1
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1answer
278 views

ISP assigned router and IP range - adding a firewall behind

My ISP has given me a router with the following information.. The router is provided by the ISP and the gateway/routerIP is already preset inside. If I were to add a firewall behind the router as ...
2
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2answers
161 views

How to evaluate and do a network simulation for an already existing LAN? [closed]

I'm an intern in a non-technological firm. it's a big company with 99 PCs and network printers. And they have the messiest Racks and LAN ever. I'm supposed to go through it, make a schema of the ...
2
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3answers
645 views

Rounting between two LANs with two gateways

It's my first question on StackExchage Can you please help me with this question? I have 2 LANs : LAN A : 192.168.60.0/24 gateway 192.168.60.1 dns 192.168.60.2 LAN B : 192.168.61.0/24 gateway 192....
3
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1answer
2k views

TCI ( Tag control information ) use VLAN

I have simple VLAN network diagram . I want to show how the TCI field can be used to have a VLAN number policy for this diagram. How do I do this?
3
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0answers
1k views

How do switches behave on multicast? [closed]

I am benchmarking multicast throughput of my LAN using an application that considers all the servers as group members. The network consists of homogeneous servers (S0-S9: 192.168.21.70-79) inter-...
1
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2answers
391 views

Optimal IP range for private LAN network

working on small LAN for a office, going to use windows server 2012 with AD which ip range is suitable for this. there's like 13pc's & 1 server
3
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1answer
245 views

Assigning IPs for a LAN which is disconnected from the Internet (private network)

Lets say I want to set up a small packet-switching LAN using TCP/IP model with 10 hosts. If I do not intend to connect my network to the Internet, which implies that this is a private network and I ...
2
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1answer
62 views

What's the technical name of this slotted type of RJ-45 connector?

What's the name of the type of plug that has the little thing on the side that prevents it from fitting in regular 8P8C sockets? Thanks!
0
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2answers
83 views

Packets for Internet Connection [closed]

Consider the following scenario: AP is an access point with internet connectivity and in idle state (ie: no node is connected to it) N is a node that wants to establish an internet connection ...
1
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0answers
62 views

Access Server on different subnet [closed]

Dears, I have a Zyxel USG20 and I defined 2 lans. The first one 192.168.1.xx and the second 192.68.2.xx on the first I have a secure server with static IP 192.168.1.101 on the second subnet I have my ...