For questions on connecting devices together so that they can communicate with each other, as well as on networking equipment such as routers and switches.

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1answer
28 views

Custom DNS server. How they reach each other?

If I have a domain, say example.com at GoDaddy, and a dedicated server, say, 123.123.123.123. I created 2 records in my named server inside my dedicated machine telling to point ns1.example.com and ...
1
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1answer
52 views

Unable to connect from one Windows machine to another

A friend of mine has two machines, both running Windows 7, both on the same network, both in a WORKGROUP. He wants to be able to connect to a network share on machine A from machine B, and I told him ...
0
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1answer
278 views

Unable to start npf driver

I need to start the npf driver for Wireshark but when I try to type "net start npf" in cmd prompt, I get the following error: "System error 1058 has occurred. The service cannot be started, either ...
0
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2answers
230 views

Proftpd - using virtualhosts, global section, server context correctly

Short version: What is the difference between the server context and a virtualhost section in the proftpd configuration file? In the sense of what can I do with the former I can't do with the latter. ...
0
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1answer
229 views

Getting redirected to us.yhs4.search.yahoo.com/yhs/errorhandler : How to change that?

If there is an error in an URL or the network is down my browser is always redirected to us.yhs4.search.yahoo.com/yhs/errorhandler (possibly with a longer URL, but that is the base). I used to get ...
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0answers
105 views

Thinkpad x200 ethernet cant connect to cisco modem (BUT to router it connects)

I got a problem with my x200 thinkpad. When I connect it with my modem/router thingy (http://www.cisco.com/web/consumer/support/modem_DPC3208.html), the connection it not established. Its get stuck ...
0
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1answer
316 views

List all entries (Machines and IP) in local DNS? Basically nslookup for all machines

I'm hoping someone can help. I'm struggling to work this out and hope that there is a simple way around it. I'm trying to get a list of all machines in a local DNS server. For the purposes of my ...
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0answers
165 views

100 mbps network transfers slows down PC

We have a network with many PC's. There is a 1 gbps ethernet switch with 8 ports and a 100 mbps ethernet switch with 8 ports. My PC is plugged into the 1 gbps switch. When someone on the network that ...
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0answers
200 views

Gigabit speed testing - Windows 7 vs Ubuntu Linux

I work for a telecommunications company and have been tasked with testing 1Gbps network speed. Our technicians use Windows 7 laptops and need to be able to test these connections at customer ...
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2answers
57 views

Questions Regarding DoS

I have a few questions i still haven`t been able to get an answer to. If someone DoS you, do it affect all computers connected to the router or just the computer that is being attacked? For example: ...
0
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1answer
14 views

What NIC is connected to what network in VMware VM

I have a requirement to create a VMware VM that must be connected to multiple networks (one vNIC for each network). IPs are assigned statically and are supplied via OVF environment properties. The IPs ...
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1answer
250 views

Insert Hyperlink to an IP Address

I can open a browser (Chrome or Firefox or Internet Explorer) and enter an IP address in the Address bar, say: 134.170.185.46 and the browser will open the website (Microsoft.com) directly - ...
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1answer
333 views

DNS problems from command prompt

I can't get a network connection when using the command line for some reason, even though it used to work. I think it's a DNS problem because I can ping 8.8.8.8 but not google-public-dns-a.google.com: ...
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2answers
1k views

How do I connect to SSH over an existing OpenVPN connection?

I have a dedicated server running OpenVPN and SSH on Ubuntu 14.04. Sometimes, port 22 is blocked on a remote network, while OpenVPN can still be used. So how do I manage to connect to SSH over the ...
0
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1answer
131 views

Computer Networks: Error and flow control

If the data link layer has error control and flow control , why do we need these 2 mechanisms at transport layer too?
2
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3answers
472 views

How does ARP Poisoning work if the IP address is wrong?

TLDR ARP Poisoning doesn't change the IP dst in the table so why does spoofing the MAC under another IP address help to redirect the traffic? Any video I find explains that the goal of ARP poisoning ...
0
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2answers
105 views

Limit a Network Adapter's Traffic to a Subnet in Ubuntu

I've set up a virtual (software emulated) network between a handful of VPSs that I run. Also on the virtual network is a linux server in my home, and on that server I've created a bridge between the ...
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0answers
35 views

Troubleshooting network connection with Ubuntu in VirtualBox (OS X)

I am setting up Ubuntu Server 14.04 using VirtualBox on an iMac running OS X Yosemite. I know very little about setting up network information, and cannot get Ubuntu connected to the internet (though ...
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2answers
187 views

Can connect to router, but not Internet

Sorry about this probably very n00b question. However, I've little idea where to start. My router is at 192.168.1.254. I can ping it and log in. My laptop (Ubuntu 14.04) has been given an address by ...
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1answer
71 views

Making a two-way bridge between two interfaces

so i wish to bridge a connection, I made a quick drawing of my setup: (eth0 isn't connected to anything) All of the computers are running centOS 7. Network Diagram I wish to allow PC A to ping and ...
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0answers
57 views

convert Ethernet router into integration gateway

I need to integrate to an Ethernet proprietary network. It is IP based but doesn't implement TCP. I need a router which will poll devices on this network, and periodically post the data using ...
0
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1answer
395 views

SSH to clients in VPN - connection refused

I'm trying to set up an OpenVPN network and allow computers on that network to SSH to one another. The reason for this setup is that one of the computers has a DHCP connection, and is behind a router ...
0
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1answer
27 views

Problems with wireless connection (Win8.1 laptop)

I'm having 3 weird issues with connecting to a wireless connection on my laptop running Windows 8.1. 1) The icon shows the wired connection icon (monitor with a cord) and not the wireless (bars) icon,...
0
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1answer
254 views

Router Blocking One Specific Site; IP resolves, but Times Out

I have a Linksys WRT54GL Wi-Fi Wireless-G Broadband Router in use. For whatever reason, for the past couple of days I have been unable to access a single web site, http://basecamp.com, through the ...
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0answers
16 views

Is there Any Way to See All Incoming Connections and Their Server Address?

I am trying to get a hold of the specific address of CDN's on certain websites and write them to a file. I understand that tcptrack and tcpdump and the like can find these addresses for me, but I am ...
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0answers
95 views

How to connect two different WiFi protocols on same laptop?

I am trying to run 802.11a and 802.11p WiFi on one laptop using shell scripts. I am getting all connections when I am doing "iwconfig" ( all connections means Wlan0 having 802.11p WiFi and Wlan3 ...
0
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1answer
64 views

Accessing MacBook local network from iPhone

I have a development environment with grunt and BrowserSync which gives me the URL 192.168.1.140:3000 to access the webpage from other devices in the same network. The URL works on the MacBook, but ...
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0answers
41 views

Windows 2003 losing the mapped disk from Win7 machine

I have some computers/servers with different versions of Windows. One of these is my [file server] with "Windows 7" OS. The second one is a [main server] which is running some software with OS "...
0
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1answer
286 views

looking for a utility to test DHCP settings

Iv'e recently installed DHCP server (isc-dhcp-server) in my workplace. I'm looking for a utility to test the network DHCP settings from a remote machine (not by using dhclient / iptables /renew). ...
0
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1answer
71 views

OS X 10.10.4 Cant connect to IIS Express asp.net web server on LAN (but other windows machines can)

I have a web server running on IIS Express. I modified the bindings in my IIS instance to run on PORT:COMPUTERNAME and also added a rule to the firewall to allow inbound requests on that port. When ...
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0answers
218 views

Tcp connection target machine actively refused

I have a simple TCP client/server program on two laptops. The server should work fine as I use "netstat -anb" and the server shows up as listening, "0.0.0.0:102", then my client connection failed, ...
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1answer
62 views

Internet cuts out on all devices connected for a short moment [closed]

This is my first time on this site so please be nice. Ok so, I'll try to make this short and sweet didnt have internet for 4 months just got it back the end of last month my "dish" the thing that ...
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3answers
76 views

How do I find out which process is using up all the TCP connections?

I can only sort by bytes or port or protocol, not number of connections.
0
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1answer
90 views

Multi-hop SSH connection

This is my connection graph: user --> example.server on port 22 with username1/password1 --> example.server with username2/password2 on different port (some ssh subsystem port, e.g. 1000). I cannot ...
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0answers
214 views

How do I join two networks without the ability to change the default gateway?

I have a handful of internet-facing Linux (Ubuntu) VPSs with a couple of providers, and I connect them together with a virtual backplane network from ZeroTier (https://www.zerotier.com/). I use this ...
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0answers
25 views

Bridge Two connections and dongle

I have this setup: I have a raspberry pi , that is acting as a 'server' (Call it A) I have a windows laptop , thats acting as client 1 (Call it B) I have a mobile phone thats acting as client 2 ...
1
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1answer
317 views

Router disconnects me every day at the same time

For some unknown to me reason my router disconnects me every day at almost the same exact time. Does anybody know what is going on? Router Log: Jul 10 09:58:16 pppd[57]: LCP terminated by peer (...
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0answers
123 views

Pinging an address shows request timeout

I am totally a newbie of Linux trying to remotely log into Debian from OS X via SSH. After installing OpenSSH on the server, ssh -vvv ***.***.***.165 gives the following output: debug1: Reading ...
1
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2answers
101 views

Router without DHCP set and has external IP from local perspective

I have a network like: x.x.0.1 - ISP's AP, then mikrotik router x.x.0.5 -> set up by specialist and another router x.x.0.7 -> for my learning purposes. My problem is, that I really don't understand ...
0
votes
1answer
53 views

Weird asynchronous speed on home server (FTP, Samba)

I have an HP Gen8 microserver for home usage. I use it as backup/replication and currently want to use it also home as media server. I back up files using FTP, governed by IIS. Backing up on LAN ...
0
votes
1answer
79 views

Do FreePbx need VPN for connection?

I heard about that PBX (like freepbx, elastix, etc...) need a VPN to users connect to it. if is it true, why it needs? if so, how can I do not use it in the user client? any alternatives? i heard ...
0
votes
1answer
100 views

Terminating cat 6 at patch panel

My patch panel does not have pin marking so I am not sure what pins 1,2,3,4,5,6,7,8. This is what my panel patch looks like this This is termination that was already done in the house but from ...
5
votes
1answer
117 views

Loading webpages causing whole network issues

I have just travelled to the US from Europe, and before that none of the problems described below happened in my networks. When I browse facebook, gmail, stack exchange etc. the network is working ...
0
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1answer
132 views

Setting up a simple 10 Gb network for collaborative video editing

We have a team of five people working on the same video editing project (using Lightworks). Our current setup technically works, but not well: the video jiggles up and down as it plays and sometimes ...
0
votes
1answer
143 views

Public IP from my ISP

I have dynamic ip address from my ISP and today I bought public ip from them. My question is: Do I need something from them to have this public ip? Do I need to configure anything on my router?
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2answers
386 views

Can I use a Huawei K5150 4G dongle to serve requests on a web server?

In order to serve HTTP requests on an area with terrible adsl, I was considering using a 4G dongle to serve those requests, since the upload is 5x higher. However, I'm noticing that the incoming ...
0
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1answer
84 views

Allowing emails on iptables

I am trying to configure my iptables firewall (currently rejecting all traffic) to allow emails traffic. For SMTP port 465 is used (SMTPS port), and for IMAP it uses port 143. But whatever I try, I ...
0
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0answers
32 views

Writing all incoming connections to a file

I am trying to find a way to see all of the incoming connections on my Ubuntu machine. I also need to write the aforementioned connections to a file, the main component I need is the IP Address of the ...
3
votes
2answers
2k views

ethernet connection makes the WiFi disable

A ethernet (Lan server) connection makes the WiFi disable automatically in windows 8.1. By switching on the WiFi manually let only WiFi to run for few moments and the WiFi goes off again. How can I ...
2
votes
1answer
156 views

TCP/IP rx data drop

I have an intermittent problem with receiving data over TCP/IP from a (Windows) server. The data is sent at 160Mbit/s and client application is running on a 64-bit Suse Linux Enterprise server. I am ...