Networking is the art of connecting two or more devices together so that they can communicate with each other.

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18
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7answers
4k views

Can a huge coiled LAN cable have some trouble for transmitting a signal?

Let's say I have a long (> 30m) LAN cable, that connect two (very close) devices. Could some of the unused wire, disposed as a huge coil, cause any issue ? I'm thinking about the special wire layout ...
1
vote
4answers
47 views

How can I check what is my ip on any particular endpoint?

I know I can do curl curlmyip.com or something like that, but that just shows me the ip curlmyip.com is seeing. Is there any tool I can use that tells me what's my ip on the endpoint for any TCP ...
0
votes
1answer
28 views

Changing TCP sliding window behaviour

We all know that TCP's congestion control uses additive (linear) increase and multiplicative decrease when adjusting sliding window size. Is there a way to change it to "linear decrease"? When a ...
0
votes
2answers
1k views

Windows Virtual Machine not seen by host (Mac OS X) using VMWare Fusion

I installed Windows XP with VMware Fusion on my MacBook and while internet works, Windows can ping the Mac, etc. from the Mac or any other machine in the network we can not see the Virtual Machine. In ...
2
votes
1answer
29 views

IP network routing: restrict traffic on an interface

My PC has wired and wireless Ethernet. The wired port connects to a private network with no Internet access. the wireless port connects to a domain network with Internet access. The problem is that ...
1
vote
0answers
21 views

Can not connect to VirtualHost when VPN

I run VirtualBox on my local machine with Ubuntu which hosts my application. Application URLs points to VM IP Address in my hosts file (/etc/hosts). And this configuration works fine. I can also ssh ...
0
votes
1answer
21 views

Monitor switch traffic load on specific port (CISCO managed switch)

For troubleshooting networks problems I need to know how to monitor the traffic (work load) on a managed switch. I read about SPAN for CISCO switches. But it seems to be overkill since it does mirror ...
0
votes
0answers
37 views

Using an old router as a secondary access point?

I have recently acquired a new router and wish to extend my "WiFi coverage" by utilizing my old router as another access point somewhere in the house. I have followed a number of tutorials and i'm ...
0
votes
0answers
22 views

Unable to open files with OpenVPN and samba (writing works)

I have setup a samba server and it works correctly from the local network. When accessing via OpenVPN both from Windows and GNU/Linux writing works but can't open any files. It just timeouts when ...
1
vote
2answers
3k views

Can't access Thomson modem interface anymore

I used to be able to access the web interface of my Thomson DWG849 router/modem through both 192.168.100.1 and 192.168.87.1, but now, suddenly, I can't anymore. I have tried resetting the router ...
0
votes
1answer
20 views

Use new Gateway as modem and another gateway as a router?

We recently got TWC internet came with the Ubee ddw365 gateway. For some reason wireless and hardwired the gateway disconnects for a few seconds almost every other minute. At a buddies house I was ...
0
votes
0answers
26 views

Can a malware transmit over hotspot [closed]

If I have a malware infected computer and I connect the computer to the internet using my phone's wifi hotspot (phone using school network) can the malware have its way into the school network I use? ...
0
votes
2answers
35 views

Is there a way to send prerecorded requests to a server? [closed]

I was wondering if it is possible to record and replay outbound POST requests from a Windows PC, and replay them. For example, if I have a POST recorder, and I send a request from Skype to make a ...
2
votes
1answer
4k views

Manually Setting Interface metric priority of Network Adapters not preferring lower metric route on Windows

After Connecting to Cisco VPN AnyConnect, Now I have two network interfaces having set same default routes, but with different metric values. Even after manually changing/raising the metric value of ...
6
votes
4answers
2k views

Cannot create external switch on Hyper-V

I am getting the following error when creating an external switch on Hyper-V: I am running Windows 8.1 x64. My switch settings are as follows: Event viewer gives me the following errors in ...
0
votes
1answer
2k views

how to test a VLAN set up under OS X Mavericks

I tried to set up an "internal" VLAN, with my mac (running Mavericks) routing this segregated traffic to one of the hardware interfaces. I think this should work irrespective of how people connect to ...
0
votes
0answers
47 views

Optimal setting for advanced parameters for Realtek PCI-e GBE family network card

superusers. I am trying to get the best possible setting for my Realtek PCI-e GBE family controller network card so that when it will be literally minimal or zero lag when playing online game. ...
0
votes
1answer
35 views

How do I find the source of my DNS errors?

I have a home network with a cable modem, wireless router, several switches and powerline adapters all connected with cat5. When web browsing, I am regularly getting DNS timeouts (1-2 every 10 ...
0
votes
0answers
20 views

Plivo SIP problems with NAT traversal

Ok, I've looked and looked, and can't seem to find anyone that's written about this problem. I have a simple office setup where there are two SIP phone extensions (Polycom 331) behind a Sonicwall ...
-2
votes
1answer
35 views

Windows FTP server that needs 99.9% up-time, virtualbox or dual boot? [closed]

I currently have an FTP server running on Windows 7 via VirtualBox. I have all the network-adapter and port-forwarding stuff done so the server is accessible outside the network. It is ready to go ...
4
votes
11answers
11k views

LAN/WLAN/home network connection dropping intermittently

I'm having an issue on our home network that is driving me mad. More often than not, when a user on our LAN is downloading and using most of the bandwidth my connection my PC or my laptop or my ...
1
vote
4answers
12k views

How can I figure out what IPv6 to use if I want to set a static IP for my computer?

I recently installed Windows Server 2012 on my desktop. I changed my connection settings to hardcode my internal IP address as 192.168.0.99 (IPv4). Windows Server 2012 warned me that I should also set ...
9
votes
2answers
4k views

Is your MAC address revealed when you hit up a website?

When you hit up a site, such as cnn.com, does the TCP/IP packet contain the MAC address of your network card? Could cnn.com theoretically record my MAC address?
0
votes
0answers
16 views

Monitoring network usage across different devices on lan [duplicate]

My internet connection has come with an upper limit on the usage after which it throttles the speed. They have provided me with a portal where they update my internet usage everyday but I have a ...
0
votes
2answers
883 views

Slackware cannot reconnect to local network

Hi guys this problem is frustrating me. After trying a lot of things to setup my wireless card, I decide to test it by shutting down LAN interface ifconfig eth0 down. Then, when I turn the LAN ...
0
votes
0answers
8 views

ARP default timeout

What is the default timeout period for ARP cache entries on Windows XP? I need to swap round some IP addresses and need to know how long to wait before the XP machines will definitely have cleared ...
0
votes
1answer
28 views

Windows 7 with two network connections needs to access specific host by name on specific connection

I'm trying to reach the web server on a host on my local subnet that has an IP address on each of two network connections. When I am using only my local office connection, my request (using the host ...
2
votes
1answer
443 views

How to connect from Windows through SSH using another Windows PC as a proxy?

I have an embedded Linux machine to which I can connect only from a certain Windows PC (let's call it WinLab) with Putty through SSH. And to WinLab machine I can connect through Remote Desktop from my ...
-1
votes
0answers
16 views

How does a network request know where to go? [duplicate]

When a web request is made from a computer, after it has been translated to an IP address by the DNS, how does it actually know where to go? For example, if I make a request to a site being hosted in ...
0
votes
1answer
16 views

iptables INPUT command

On a ubuntu1, this is iptables command: sudo iptables -A INPUT -p icmp -j DROP so on the other computer (xp1) I can not ping the ubuntu1.So this is OK. But On ubutnu I [[ can ]] ping xp1. and I ...
1
vote
1answer
4k views

Hamachi network adapter won't install in windows 7

I had Hamachi working normally for some time, then out of the blue it started giving me VPN error (showing that yellow triangle with an exclamation mark) for every single person on my networks and I ...
1
vote
0answers
4k views

Cannot delete a route in redhat linux

I have the following entry in a redhat linux machine to reject the private network route: Destination Gateway Genmask Flags Metric Ref Use Iface 10.0.0.0 - ...
0
votes
4answers
3k views

How to skip pushing the default gateway via DHCP in OpenWRT?

I have a router with OpenWRT that I want to resolve IP addressing with DHCP without setting a default gateway. I have added a DHCP-Option parameter with value 3,0.0.0.0 that is supposed to set the ...
0
votes
0answers
5 views

How to portforward in Tenda TEI480T+

I just want to ask if anyone has a tenda router TEI480T+ dual wan. I have a problem regarding in portforwarding (virtual server in this router) because even I already added the IP address of the PC ...
0
votes
1answer
25 views

iptables duplicate traffic to another ip

This blog post has a template iptables rule to forward traffic, to and from the router to another ip address. iptables -t mangle -A POSTROUTING \ -d [IP to spy on] \ -j ROUTE –tee –gw ...
8
votes
6answers
558 views

How do you protect your computer from Live CD's?

Linux has grown in popularity in the past few years. Many more people are using Live CD's now than they were say 3 years ago. And with this comes a new problem for network admins. How do you stop a ...
0
votes
0answers
25 views

Is virtualbox birdged adapter slower than NAT?

I use samba server to share files between ubuntu and windows 7. The samba requires the Windows 7 and Ubuntu must be in same net section (eg. 192.168.0.108 and 192.168.0.125) in this way the samba ...
0
votes
2answers
3k views

Network bridge in Windows 7 immediately drops internet access on host computer

I'm trying to bridge my laptop's wireless internet connection to my PS4 (the PS4 has spotty wireless while my laptop does not), but every time I bridge the wireless adapter's connection with the wired ...
6
votes
3answers
2k views

How can I get information about an network interface uptime?

I have an Ubuntu machine and a Debian machine. On both I want to be able to see for how long an network interface has been connected. (That is, connected to a network getting an IP etc. Not the ...
1
vote
0answers
35 views

Can a VPN service totally hide my computer from WiFi network discovery like no computer connected?

There are many devices connected to WiFi router and one can easily know how many devices are connected by using various network discovery tools available for windows and Android or by brwosing router ...
0
votes
1answer
18 views

netsh advfirewall open TCP ports 80 and 443 for outgoing traffic

I need to do the following with netsh advfirewall commands: Open TCP ports 80 and 443 for outgoing traffic to dc.services.visualstudio.com and f5.services.visualstudio.com. How can I do this?
0
votes
1answer
15 views

suddenly no service, except ssh is accessible from wan

I recently did install the GNOME Desktop and Graphical Administration Tools package groups to my remote host, for remote desktop connection. After the installation of nearly 550 dependencies was done, ...
0
votes
1answer
24 views

Changing the default network VirtualBox assigns to VMs attached to NAT

By default, VirtualBox assigns a 10.0.2.0/24 address to a VM attached to NAT. Is it possible to change NAT to a different network? This is not a duplicate question. I know it is possible to define a ...
0
votes
3answers
3k views

Linux Mint Wifi keeps disconnecting at random times and asks for wifi password

I have a fresh install of linux mint 16 cinnamon edition. I have a Netgear wireless dongle model: WNA1000M. Is there any command i should run to get more details? Wifi drops about: 15min to 1hr.
0
votes
1answer
21 views

Windows 7 cannot access network PC after name changed

My PC was able to be accessed by other PC on the network without any problem before. But now, after I renamed my PC, other PC cannot access to my PC. When they try to access, they will see a popup ...
2
votes
1answer
31 views

Why do upload speeds require time to build up?

When working on a remote server, I notice that when uploading small files (let's say 0.1 - 0.2 MB) I get significantly slower transfer rates than when uploading larger files (1MB +). It seems like ...
1
vote
1answer
38 views

Bypassing the router doesn't work?

So I'm trying to bypass my router, just for kicks. I thought it'd be pretty easy, just connect the router-modem wire to the computer, and I did just that, but I'm not getting an internet connection. ...
11
votes
2answers
18k views

How to delete a VPN connection in Windows 8?

How do i delete a VPN connection in Windows 8? In Windows 8 i can have VPN connections: How do i delete them? Things i've tried: right-clicking the connection name hold-clicking the ...
0
votes
2answers
5k views

Can't connect to PPTP VPNs in Windows 8.1

I have a couple PPTP VPNs which I've set up in Windows 8.1 . They were working fine for months and months, able to connect with no issues. Then a couple weeks ago they stopped working, and I get a ...
0
votes
3answers
6k views

How to monitor network interface card utilization?

I want to check the utilization of the network interface card while running a communication-intensive benchmark . Can anybody tell me which unix/linux command I can use to monitor the network traffic ...