Questions tagged [local-area-network]

LAN, short for Local Area Network, is a network that connects multiple devices in a limited geographical area, such as a room, an apartment or a building. Currently, most LANs are based on Wi-Fi or Ethernet transmission.

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Top level domain/domain suffix for private network?

At our office, we have a local area network with a purely internal DNS setup, on which clients all named as whatever.lan. I also have a VMware environment, and on the virtual-machine-only network, I ...
Otto's user avatar
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58 votes
12 answers
9k views

What should I pay attention to when I'm buying a network switch?

Since I'm not a hardware expert, I don't know what features make a network switch a good network switch. What should I pay attention, when I'm comparing the different models from different vendors?
splattne's user avatar
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39 votes
5 answers
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How to route different traffic thru different network interfaces (in Windows)

I've searched for details on how to do this but I've been unsuccessful - I wondered if someone could offer up some advice. So, let's say I have 2 network cards (LAN and 3G in my instance), both ...
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23 votes
4 answers
107k views

Duplicate MAC address on the same LAN possible?

Let's say someone is on the same network as me and spoofs their MAC address to match mine: Is this possible? Can two or more clients with the same MAC address be on the same network at the same time ...
Aaron's user avatar
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18 votes
6 answers
14k views

Per-user hosts file

Is there a way to define host aliases (like in /etc/hosts) on a per user basis, i.e. in a file /home/user/.hosts ? My primary objective is to easily share host aliases via rsync between the machines ...
mrucci's user avatar
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17 votes
2 answers
43k views

Load balancing & NAT-ing multiple ISP connections on Linux

I have two internet connections from two different ISPs and I need to balance the traffic originating to and from my network between the two ISPs. I am using Debian GNU/Linux. My set-up is like this -...
Baishampayan Ghose's user avatar
15 votes
7 answers
4k views

How much electricity is required to power 20 'average' computers on a LAN?

i trying to see how much electricity is required to power 'x' number of computers. I know it's a vague thing because some computers draw more than others (eg. diff chipsets, HDD, vid cards, PSU's, etc)...
Pure.Krome's user avatar
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15 votes
8 answers
907 views

Building a LAN on in the woods

A very long time ago, I had to build a LAN for a bunch of laptops, in a couple of tents. We ended up bringing a bunch of generators, stringing about 2 miles of networking and power cables, and ...
Shalom Craimer's user avatar
14 votes
3 answers
38k views

Routing WIFI and LAN for specific traffic

I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2....
jakebird451's user avatar
14 votes
4 answers
21k views

Should a webserver in the DMZ be allowed to access MSSQL in the LAN?

This should be a very basic question and I tried to research it and couldn't find a solid answer. Say you have a web server in the DMZ and a MSSQL server in the LAN. IMO, and what I've always ...
Allen's user avatar
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14 votes
5 answers
29k views

Linux router: ping doesn't route back

I have a Debian box which I'm trying to set up as a router and an Ubuntu box which I'm using as a client. My problem is that when the Ubuntu client tries to ping a server on the Internet, all the ...
El Barto's user avatar
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14 votes
3 answers
15k views

IPSec for LAN traffic: Basic considerations?

This is a follow-up to my Encrypting absolutely everything... question. Important: This is not about the more usual IPSec setup, where you want to encrypt traffic between two LANs. My basic goal is ...
Chris Lercher's user avatar
13 votes
3 answers
927 views

Prevent administrative users from assigning duplicate static IPs to their workstations

How can I prevent a user that is an administrator on their local machine from manually assigning an IP to their network adapter that is in use on a server? Some users have done this, and it's caused ...
despe's user avatar
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13 votes
2 answers
28k views

How to scan ipv6 enabled hosts on my LAN?

I want to discover all my neighbors who enabled ipv6 protocol and still alive. I tried ip -6 neighbor show but it shows nothing. Can someone recommend a tool and show some examples? Thanks.
Douglas Su's user avatar
13 votes
2 answers
19k views

Captive portal popups: the definitive guide [closed]

I'm manually implementing a WiFi captive portal. I've got everything pretty much working BUT a single hitch: i want everyone to see their mobile OSs' (or computer OSs') captive portal popup for a ...
ppparadox's user avatar
  • 141
12 votes
4 answers
82k views

Access ports versus trunk ports?

Can someone please explain the difference between access ports and trunk ports on a switch? I'm starting to learn networking, and my understanding is that access ports are used to connect endpoints (e....
BJ Dela Cruz's user avatar
11 votes
4 answers
12k views

Windows Server 2012 R2 DataCenter The request to list features available on the specified server failed

I am trying to add the Wireless LAN Service to my server but I first had to restart it because it installed some updates a while ago. After the restart it came up with the following error: The ...
Menno van Leeuwen's user avatar
10 votes
10 answers
58k views

Find which machine is using all the bandwidth

I need to know which machine is taking all the network bandwith. It's there a tool I can use to monitor my local network and know which machine is taking all the LAN bandwith? What do you think ...
Cédric Boivin's user avatar
10 votes
2 answers
19k views

Do switches sometimes need rebooting?

In your opinion, do switches sometimes need a restart? I'm asking this because today our NAS stopped working properly, and was only fixed when we restarted the switch it was attached to.
stighy's user avatar
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10 votes
7 answers
1k views

10 gigabit networks: Decieding between fiber and twisted pair

With a green field installation 10gbps network (no legacy equipment to support), why would one select one physical medium over the other? If left to impulse, I'd probably go with fiber optics over ...
Stu Thompson's user avatar
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10 votes
4 answers
21k views

What happens if you short-circuit a network patch cable?

Today we had some network problems and after some nested-interval trial and error we tracked down a small 4-port hub where someone had connected both ends of a patch cable to the same hub. After ...
Daniel Rikowski's user avatar
10 votes
1 answer
180 views

throughput drops near zero using directional radio relay

We are using the following 1Gbit/s radio link setup: Location A: internet gateway with 1Gbits/s sym. fiber most of our servers including dhcp, dns, fileservers (smb), voip-server, exchange-server 55 ...
Stephan's user avatar
  • 262
9 votes
1 answer
376 views

LAN: What are the things to look at when arriving in a new place

My company is moving to a new place, and the only thing I know about the cabling is that there are cables and a patch panel. I have no idea about the cable speed, quality, and I'm a software guy with ...
CharlesB's user avatar
  • 585
9 votes
2 answers
14k views

Cannot ping over LAN until a ping is received

I have two OSX machines on a local subnet. Pings from Machine A to Machine B consistently timeout until Machine B pings Machine A. After B pings A, A can successfully ping B, but this success is ...
ericsoco's user avatar
  • 193
9 votes
4 answers
20k views

Can't communicate between lan ports on openwrt router

I've got a WBMR-HP-G300H Buffalo Airstation router on which I've installed the lates OpenWRT software. All is working well (ADSL, WIFI etc) except for one niggle. I can't communicate between lan ...
ScaryAardvark's user avatar
8 votes
9 answers
6k views

Find Sniffer on LAN

What tools or techniques are available for *nix and Windows that help in finding if someone else on the LAN is using a sniffer? Having said that and strongly considering that there are tools out ...
Anand Shah's user avatar
8 votes
5 answers
18k views

Should I use rsync compression over a gigabit LAN?

I normally use rsync's -z option to enable compression when transferring files over the internet. However, if I am on my own (idle) gigabit LAN, do I still want compression? Or will it be faster ...
Corey Goldberg's user avatar
8 votes
7 answers
2k views

Best choice of private addresses for a "device area network"

I'm building an appliance consisting of several subdevices connected by ethernet inside the appliance. The appliance will connect to the customer network. The customer network can be using private ...
proski's user avatar
  • 203
8 votes
3 answers
29k views

Best way to create a vpn between two windows machines?

I'm looking for way to create a VPN between two windows machines. I want the installed software to behave as if the two computers are connected through a LAN. What's the best (free) way to do it? ...
Adam Matan's user avatar
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8 votes
2 answers
3k views

Are these DNS settings a good idea or not?

We have a very small (5 workstation) network with one Windows Server acting as domain controller, DHCP and DNS server. All devices are connected to a standard switch which in turn is connected to a ...
userSteve's user avatar
  • 1,613
8 votes
1 answer
1k views

A few websites are not reachable using Linux gateway

We have a LAN and a Linux Box is used as an Internet gateway. On this gateway, we have installed intranet mail server (sendmail), fetchmail, proxy and DNS. A leased line is connected to this gateway ...
Silkograph's user avatar
8 votes
3 answers
2k views

Migrate raw disk image over LAN

Here is my situation: Two dedicated servers in the same datacenter with gigabit ethernet between them. Both dedicated servers booted into a rescue environment based on Debian Squeeze with extra tools ...
allquixotic's user avatar
8 votes
4 answers
6k views

Should / Can I use DNS Records to list "Private Hosts in Private LANs"?

This is a theoretical Question: Given I have several Serves that both have a Public IP Address as well as a private IP Adress (192.xxx Range). Both Addesses are used for different Services. I do not ...
jens's user avatar
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8 votes
2 answers
17k views

Enable user registration - eJabberd

I am a complete n00b to configuring Jabber/XMPP servers and I am hoping to get some help getting set up. I have done all of this and installed pidgin. I seem to be able set up my "admin-user" in ...
travega's user avatar
  • 206
8 votes
5 answers
10k views

Windows 7 network performance tuning for LAN

I want to tune Windows 7 TCP stack for speed in a LAN environment. Bit of background info: I've got a Citrix XenServer set up with Windows 2008R2, Windows 7 and Debian Lenny with Citrix kernel, ...
Hubert Kario's user avatar
  • 6,401
8 votes
0 answers
186 views

Shocking ESD damage, what more can be done? [closed]

Today, over $6,000 in networking equipment was destroyed. Remarkably, the main circuit SPD, power strips and APCs are fine. Ethernet seems to be the method of surge transmission, as everything ...
Justin's user avatar
  • 81
7 votes
2 answers
14k views

TCP/IP routing: accessing a LAN device with wrong static IP configuration

I forgot to change the static IP of a network device before moving it from my datacenter network to my home LAN. Since it isn't configured properly for my LAN network, I'm not sure how to access it. ...
Michael McDonald's user avatar
7 votes
6 answers
12k views

Encrypting absolutely everything, even within the LAN

Has anybody tried that approach already? I'm really considering it: Instead of relying on network based IDS etc., every packet must use encryption which was initiated by a certificate issued by my own ...
Chris Lercher's user avatar
7 votes
1 answer
4k views

Surge protection for outdoor network cable run [closed]

I'm going to have a network cable run between floors of a home, and most of the run will be outdoors, up the side of the building. I ordered a spool of shielded UV-rated waterproof Cat6 cable. From ...
cp.engr's user avatar
  • 206
7 votes
3 answers
11k views

LAN access with Cisco AnyConnect Secure Mobility Client v. 3.0.4235

Whenever I connect to a VPN server using the Cisco AnyConnect Secure Mobility Client v. 3.0.4235 (probably also with other versions) I lose access to my LAN. I hope to remedy this by manually adding ...
Wuhtzu's user avatar
  • 346
7 votes
4 answers
52k views

What happens if two computers have the same MAC?

Possible Duplicate: Can duplicate MAC addresses on same LAN cause trouble? What happens to network traffic on a switched LAN if two devices have the same MAC (probably because one is cloning the ...
Josh's user avatar
  • 73
7 votes
5 answers
38k views

Unable to access local network when Cisco VPN client is connected

I'm a developer and don't have much networking expertise, so bear with me. I'm using the Cisco VPN Client 5.0.02.0090 to connect to my work's VPN that way I can RDP into my work computer. Once ...
Bryan Roth's user avatar
6 votes
3 answers
3k views

Connecting hundreds of servers via the local network (LAN)

I'm caching lots of data in memory to a local Redis server. The server will need to connect to hundreds of other servers in the same data center (as they all need to access the same information ...
Levi Hibbitts's user avatar
6 votes
3 answers
16k views

How to configure bind9 to be a local DNS only with no internet access?

I want to configure bind9 to be a local DNS only with no internet access at all. So I have 5 PCs in my virtual domain xy.com. Within this domain there is no access to the internet. The DNS server ...
JohnnyFromBF's user avatar
  • 1,259
6 votes
2 answers
6k views

Will 100 Mbps client slow down 1000 Mbps network?

Newbie question: We are planning to setup a LAN in our lab, and are looking at gigabit ethernet switches. A couple of our older computers have 100 Mbps ethernet, will they slow down the whole network ...
hpy's user avatar
  • 865
6 votes
6 answers
34k views

What am I doing wrong with this cat 6 patch panel wiring?

top number is transmitter bottom number is remote terminator 12345678 36145278 is this because I could be mixing T568A and T568B wiring? how do I know if my patch cord is A or B? Do I just look at ...
ChatGPT's user avatar
  • 336
6 votes
2 answers
10k views

Samba domain trust errors on a specific interface

We have a windows domain that also has a RHEL member server in it. All the servers have a primary network connection to the LAN, but some servers also have private dedicated links to the RHEL server, ...
Univ426's user avatar
  • 2,149
6 votes
1 answer
9k views

iptables - allow connections only from LAN

Is there a way to deny all external traffic (WAN) to SSH and allow only local traffic (192.168.0.1 to 192.168.0.255) and what would be the rule?
DesMoines's user avatar
6 votes
2 answers
3k views

Setting up IPSEC on LAN between two hosts (OpenBSD)

Trying to use IPSEC between two hosts on a LAN. No VPN involved Using OpenBSD 5.8 (in VirtualBox). I'd prefer to use OpenBSD's built-in support for IPSEC and key exchange and not a third-party. Two ...
Neil McGuigan's user avatar
5 votes
2 answers
1k views

The challenge of connecting the network of two building

Scenario I am working in a company where the building with 3 floors (ground + 2 floors) and the current network is running normal is mixed CAT 5 and 5E, 3Com 4200 series / HP 1910 series manager ...
rodsup's user avatar
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