Questions tagged [lan]

For questions about Local Area Networks (LANs).

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94 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 ...
-2
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1answer
609 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
2
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1answer
70 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
2k 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
2k 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 ...
3
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1answer
8k 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
190 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 ...
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0answers
47 views

Setting the same host address on different networks [closed]

I have a set of devices to be deployed on different local networks which have to be configured without DHCP. Every network has the same subnet mask and the gateway and the device in every network ...
0
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1answer
3k views

Is eduroam blocking all requests toward clients? [closed]

I have tested some features of the eduroam network, and it seems that many requests between client computers are blocked. Does it mean that I cannot share files within the network? And does it mean ...
19
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4answers
13k views

Why is the CAM table in a switch called CAM table and not MAC table even though it holds MAC addresses?

I know the CAM table in a switch holds MAC addresses and the ports that are associated with the respective MAC addresses. There are no such thing as CAM addresses from my knowledge, so why is it ...
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2answers
73 views

Working of bridges not making sense

I am reading the book on Data Communications and Networking by Behrouz A. Forouzan Suppose a device A on LAN 1 wants to connect to the device B on LAN 2 . Initially the bridge table is empty . ...
2
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1answer
366 views

Switch-to-Switch Traffic Protection

I am currently working a project dealing with network security, and my question is that what is a feasible way to protect traffic on a switch-to-switch link in a LAN, not end-host-to-end-host ...
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3answers
22k views

Is it better to use channel 13 than channel 11 on 2.4GHz band

When I analyzed the wifi networks in my area, most of them are set on channel 1 and channel 6, so it would be most wise for me to set it on channel 11. My router however, provides the option to set ...
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1answer
1k views

Connecting two switches together over longer distance fails

I am working in a small business, but the office is quite large. For ages, everything ran over Wi-Fi here, but it's simply not reliable enough (Walls blocking signal, high latency, etc). Some days ...
1
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1answer
3k views

Beginners Guide to VLAN with Netgear & Ubiquiti HW VLAN101?

I've got a few questions related to networking, more specifically VLAN'ing. I've got a Gateway/Router - Ubiquiti USG I've got a 48Port Netgear Switch - Netgear GS748Tv5 L2+/L3 Lite I've got 5 ...
1
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1answer
33 views

ASA 5508X to a Modem that only provides LAN

I am VERY new to networking but how does an ASA5508X need to be configured to talk to a Modem that has only 1 LAN port on it? I have to configure an "outside" ip and subnet. MY ISP is only able to ...
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2answers
1k views

What are the advantages and (if any) disadvantages of putting security on both switches and routers?

I appreciate some of the most obvious advantages of security on both switches and routers are things like stopping unauthorized access and preventing any unwanted configurations. However, I can't ...
2
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1answer
719 views

Purpose of CSMA and OFDM in WLANs

Do wireless networks employ both Carrier Sense Multiple Access and Orthogonal Frequency Division Multiplexing? If so, what are their corresponding roles? I'm not a professional and I am confused as to ...
0
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1answer
4k views

Correct way to set up network with multiple routers/access points over fiber/ethernet [closed]

Heading Below is a network map for a network. Router 192.168.0.1 has DHCP enabled. Routers 0.2, 0.3, and 0.4 are connected via their LAN ports to router 0.1 by ethernet cable, and have DHCP disabled ...
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2answers
1k views

How do broadcast communications work between hosts with different Subnet Masks?

Let's say I have three different hosts connected by a Layer 2 Switch: A) IP 1.0.0.1, Subnet 255.255.255.0, B) IP 1.0.0.2, Subnet 255.255.0.0, C) IP 1.0.1.1, Subnet 255.255.255.0, Who would a ...
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2answers
61 views

How to work around WiFi bandwidth limit on big events, where there are a lot of devices connected?

Assuming we want to serve something continuously on a local network to hundreds or thousands of devices, is there a solution, except for creating multiple separate networks? Or am I entirely wrong and ...
2
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1answer
318 views

What is the difference between Host Bus Adapters, Converged Network Adapters and Network Interface Card?

I am learning about SAN. I know about LAN and NIC. I wanted to what is the difference as per the above subject of the question? HBA/CNA supports Fibre Optic Cables (SMF/MMF). Please provide some ...
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1answer
485 views

Why is my pc not forwarding packets to my default gateway?

I understand that if I were to send a packet to a destination outside my LAN, it would have to reach the gateway first before it is being routed to the final destination. However, when I visit a ...
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2answers
226 views

ARP reply and use

I have a very rudimentary doubt. I am sure missing something but cant recollect what. Suppose we have 2 hosts connected on 2 interfaces of a switch. if host 1 pings host 2 , it will first send an ARP ...
6
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2answers
4k views

Full Duplex and Collision Domain

I have a very basic query on Collision Domain and Full Duplex Mode. There are two types of logical topology: Ethernet and Token Ring . Whenever we read about Ethernet the first thing that we are ...
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4answers
4k views

How can multiple devices share an IP across the internet?

I do realize that most LANs sit behind a device running NAT, which translates the users private IP address to a public IP address. My question is still if you are trying to connect to a private device,...
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5answers
37k views

Different subnets in the same LAN

I have a very rudimentary doubt. We know that a LAN has addresses in the same subnet. The LAN ends at the gateway router with that interface also belonging to the same subnet. But what exactly will ...
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2answers
541 views

If, and why torrent traffic is creating greater congestion on a link, than regular traffic of the same size?

For simplicity let's assume that we have very simple LAN. There is some router with uplink to the internet. To this router there is connected some basic 24 ports switch, and from that switch there are ...
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2answers
130 views

Why the DHCP provide us our subnet? [closed]

I'm trying to learn the DHCP protocol and the importance of what he gives to the computers connected to him. If I send everything through the router, why I need the DHCP to provide me the subnet of ...
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2answers
185 views

Unable to access local server via domain [closed]

I have a lan server with websites that need to be accessed remotely and locally via domain names. The domain dns is setup to my ISP static ip, and router's firewall is open on port 80 and is ...
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3answers
1k views

spanning tree at layer 3

we want to prevent loops in the network be it LAN or WAN. However for layer 2 LAN networks STP is used to prevent looping switches. However at layer 3 TTL field is used. why not use STP for layer 3 ...
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1answer
997 views

How are duplicate packets handled at the Data Link Layer?

Reading up about the data link layer I found that the logical link control sublayer uses sequence numbers to find duplicate packet frame transmissions. I understood the sequence number game with ...
1
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1answer
962 views

What is the ports that I should close in firewall to protect my LAN?

I use a firewall with two interfaces to protect my network but I don't know witch ports to close or open in LAN and WAN interface ? thanks for your help !!
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3answers
110 views

Is it possible to set a 3 computers LAN using just cables?

I'm absurdly new on networking, and I just want to know if it possible to set a network with 3 computers without a router, switch; just UTP CAT5 cables (or any category)
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4answers
3k views

Identifying WAN or LAN side IP addresses on cisco routers

I have a requirement to regularly produce spreadsheet showing Cisco router interface information, in particular bandwidths of each interface and IP addresses. I have access to a network management ...
1
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1answer
395 views

Re-routing packets to private ip through public ip? [closed]

Many WiFi-routers have the feature to block LAN connections. A router is configured to block traffic for private IP addresses 10.x.x.x, 172.16.x.x, 192.168.x.x except few like 10.0.0.1. Internet ...
2
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1answer
11k views

Access pfSense LAN through OpenVPN

I'm trying to access a LAN through OpenVPN. My current setup is that I have one machine (Linux (old)) that can successfully connect to OpenVPN running on a pfSense (2.3.2) machine. Behind the pfSense ...
2
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3answers
159 views

Restructure my network without breaking connections

What I want to do may be pretty simple but I'm not very experienced with networking. I'll use pictures to explain, this is my current setup: I want to extend my network so that I can add more devices,...
1
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1answer
441 views

Token ring topology and token passing concepts

In token ring topology, if a host needs to send data, it grabs the token and sends data. Once it receives it again it frees the token. This is what I know about token ring Is token is held by host, ...
1
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2answers
239 views

Why can't the gateway block fake ARP replies?

So here's my understanding of ARP spoofing. I'm malicious, and I want you to think I'm the gateway. So when you ask "if you're the gateway, please reply with your MAC", I reply, "I'm the gateway, here'...
1
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1answer
548 views

Arp spoofing and ip detection

I am testing two differents lan and I am tring to sniff traffic with Mitm attack using simple Linux shell command like arpspoof and whireshark to sniff the packets. In the first lan I can sniff ...
0
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3answers
1k views

Power usage of ports of the Switch

I have doubt regarding the swicthes of network.I want to know the power usage of the switches by changing the active number of ports. If I change the egress traffic ports(like port2 port3 etc.,)by ...
2
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2answers
558 views

Review of network connectivity diagram

Greeting's, this is my first attempt at network connectivity and hence would truly appreciate if community at large can review and guide me through it. We have one main office with 7 branch offices. ...
0
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1answer
121 views

How to monitor "Web Activity" of standalone users/clients on WiFi/LAN without restricting them?

kindly help me How can I monitor "Web Activity" of standalone users/clients on WiFi/LAN without restricting them? => Requirements:- (1) Just want to monitor "The visited websites, HTTP, HTTPs, FTP,...
2
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1answer
8k views

Port Forwarding on unavoidable Double-NAT pfSense

I've got a pfSense box which is acting as DHCP/DNS for one LAN, which all office computers and servers connect to. We have a modem which cannot be put into bridge mode for several reasons and cannot ...
0
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1answer
54 views

There's a 112V voltage (AC) between my 8-port switch and the radiator in the room. Is this problematic? [closed]

Yesterday I've ordered a new switch for my PC-setup at home, because the old one was only a 100Mbit-switch and we got a 200Mbit internet-line this week. ("D-Link 8 Port Gigabit Unmanaged Metal ...
1
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1answer
682 views

Juniper EX IPv6 outside LAN isn't working

JunOS version: 12.3R11.2 Juniper EX switch with 2 VLANs: vlan 0: IPv4: 10.0.0.6/20 This vlan is used for private IP space vlan 1: IPv4: X.X.X.254/24 IPv6: XXXX:XXXX:X:XXX::ffff/64 This vlan is ...
0
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1answer
67 views

Monitoring IBSS (ad hoc) networks

I have router enabling fixed MAC's to connect to internet. All devices are connected by LAN to the router. Problem I'm having is that i don't want to allow another device connect through one using ad ...
0
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1answer
203 views

MDNS protocol is normal? [closed]

I have a LAN with about 120 PCs, in the last 2 weeks I am facing a problem, the network sometimes go very slow and sometimes the users cannot reach the internet ( the router will be unreachable) and I ...
11
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3answers
6k views

Why do we need MAC Address if we can uniquely identify each machine with an IP Address

I learnt that in ARP Protocol, to send a packet from one machine to another machine we need to know the MAC Address of the destination machine but since the destination has already been assigned a ...