Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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1answer
77 views

Hyper-V virtual machine upload speed unbelievably slow

I have the weirdest problem I was hoping you could help me with. I've got a dedicated Server 2012R2 server with an Intel 82580 network adapter. It runs a couple of VMs in Hyper-V that are attached to ...
1
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2answers
22 views

Invoke-WebRequest timeout if NIC 1 disconnected

I have a windows pc with three network interfaces. One is a UMTS modem and the two others are lokal networks and one network has connection to the internet. Invoke-WebRequest ...
8
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2answers
1k views

Network Cable is NOT unplugged Windows ARGH

Okay this is driving me NUTS. The server will sit with a Network Status of "Unplugged" for ages until it is rebooted. This seems to occur at random times (2am, 10pm, 8:30am, 3pm etc) it does once ...
96
votes
4answers
16k views

Should I quit using Ifconfig?

With the servers that mount Infiniband cards, when I use the ifconfig command, I get this warning: Ifconfig uses the ioctl access method to get the full address information, which limits hardware ...
0
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2answers
52 views

Http Requests: how to identify a machine using multiple IP addresses

I have an http server. Is it possible to identify a machine, which is making http requests to my http server using different IP addresses? In other words, is it possible to identify a machine, by ...
2
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0answers
30 views

How do I enforce preferential routes with BGP & Quagga?

I have two routers that I'm setting up currently and they will be feeding my network of servers with a private AS number provided by the datacentre. What I want to do is provide both a VRRP failover ...
0
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0answers
25 views

MySql JDBC - java.net.ConnectException: Connection refused, can't see why [duplicate]

I have a test environment with MySQL 5.6 server running on a Windows machine and a Linux machine running a webserver. When I start the webserver it tries to connect to MySQL via: ...
0
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1answer
60 views

How to limit outgoing traffic per IP Address using Linux TC

I want to limit outgoing traffic per IP address. For example I have a network interface eth0, having 1Gbps of bandwidth. I want to limit the whole network interface to 1Mbps each destination IP ...
2
votes
1answer
53 views

VMware Vsphere Monitoring and Alerting Network Outage

I am trying to set up an alert to email out when any of our VMs lose network connectivity. I'm trying the following settings but I do not get any alerts when I kill the network connection. Alarm ...
3
votes
3answers
2k views

Is there a way to pass VLAN tagged frames through managed switch?

I currently have a managed switch (DGS-3120-24SC) configured for private VLANs (secondary and primary port groups). Secondary ports are isolated from each other and forwarding is not possible between ...
2
votes
4answers
3k views

Persistent static ARP entries on Windows, is it possible?

I am currently running coLinux configured in "ndis-bridged" networking mode, on a machine whose wireless networking card or driver seems incapable or unwilling to accept non-broadcast layer 2 traffic, ...
1
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0answers
20 views

Firebox x700 Reset to Default Not Working

I found a site that explains how to reset a Firebox 700 series back to default as you can see from this link: https://www.hashdoc.com/documents/7502/how-to-default-a-watchguard-firebox-700-or-x700 ...
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3answers
1k views

Is it possible to SSH access a server with a misconfigured subnet?

We have a server where one of our engineers misconfigured the subnet and now we are locked out of this server and the only access that I know of would work is a serial console from IDC (it means ...
9
votes
2answers
1k views

Free, web based alternative to Visio? [closed]

I have used Visio to map out my network structure, and have used the export function to create an HTML page that is searchable by IP, hostname etc. This is a really nice tool and I use it often. ...
0
votes
3answers
93 views

Mess of a system : Where to start? [closed]

I just started a role as the sole "IT guy" in a company of over a hundred people. This is a company that has had a troubled history with IT, managing to go through 6 people in as many years. During ...
1
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3answers
80 views

Using a computer with many COM ports as a low cost out of band solution?

I'm trying to come up with a cheapo out of band solution for my cisco routers in our data center. I want to be able to access them directly from the console remotely so if they are not accessible from ...
0
votes
1answer
49 views

Unstable connectivity on Ubuntu server 14.04 with two network adapters

I'm experiencing a weird behaviour on my server. It is a virtual machine, running on ESXi which is hosted on a "so you start server" from OVH. i want the virtual machine to have two network adapters: ...
0
votes
1answer
17 views

voice vs data device authentication

When a device is plugged into a switch (let's say, a Cisco Catalyst switch) how does a switch know whether the device is a VoIP one - and subject to being placed into the voice VLAN - or some other ...
0
votes
1answer
20 views

Openning an RTSP port in linux

I want to check if a client can access a server via rtsp://192.168.1.5:554. As you can see the rtsp protocol and port #554 must be open and working on the server. Can I add iptables -A INPUT -m ...
9
votes
3answers
25k views

Bridging wlan0 to eth0

On arch Linux, I would like to mainly have eth0 (connected to bridged router) share the connection recieved from wlan0, Ive read tutorials but I'm not command sabby as other users are and don't ...
7
votes
6answers
4k views

Linux Command line tool to work with netmasks / CIDR notation [closed]

I'm terrible at working out network subnets in my head. Is there some command line tool for linux (ubuntu packages a plus), that lets me put in 255.255.255.224 and it'll tell me that is a /27?
86
votes
7answers
86k views

Setting the hostname: FQDN or short name?

I've noticed that the "preferred" method of setting the system hostname is fundamentally different between Red Hat/CentOS and Debian/Ubuntu systems. CentOS documentation and the RHEL deployment guide ...
2
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5answers
27k views

How to extend IP Range from 192.168.1.1 to 192.168.2.254

Here's my question. I currently have a network setup to have Static IP manually assigned between 192.168.1.1 and 192.168.1.99 and the rest (192.168.1.100 through 192.168.1.254) assigned automatically ...
1
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0answers
24 views

Run application from network drive takes long

This problem started recently, and I wasn't able to find a solution. Not even formatting solved. We have a program on our network drive and the Whole company accesses to this single exe. Usually the ...
2
votes
3answers
2k views

Right Clicking Network File Very Slow Over VPN

I am having real troubles with a VPN connection. The VPN connection is not used for a internet connection just for file browsing. File browsing is slow, taking about 3-4 seconds to bring up a list of ...
1
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0answers
91 views

Event id 4227 tcp/ip warnings on Windows 7

We're deploying a new image out to the field, and we're seeing tcp/ip event id 4227 warnings periodically throughout the day (1-3 a day). The event message reads as follows: TCP/IP failed to ...
6
votes
3answers
11k views

How do you configure QoS for Skype?

On our office network (26 people), some users have complained of poor Skype call quality, particularly in the upstream direction. I wanted to ask, how do I identify Skype traffic, considering that it ...
20
votes
11answers
26k views

Windows Server 2008: specifying the default IP address when NIC has multiple addresses

I have a Windows Server which has ~10 IP addresses statically bound. The problem is I don't know how to specify the default IP address. Sometimes when I assign a new address to the NIC, the default ...
0
votes
0answers
22 views

Is 'offline files' the cause of my network problems?

I have inherited the responsibility of a network with 4 virtual Windows 2008 R2 servers and 25 clients. Users work a great deal with files on a share on one of the servers. They often make one or more ...
0
votes
2answers
83 views

Odd Network Cable Color Coding Sequence

I just got hired into a new company where no IT has been before. My first task was to identify the possible problems. This is what I first saw, when checking on the cables connected to the switch, I ...
2
votes
1answer
30 views

How to check SSL connectivity between certificates installed on two different server

Suppose there are two organizations which share information with each other. Every organization installs SSL certificate in their application server and provides the same certificate to other ...
1
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4answers
178 views

Cisco ASA Implicit rule dropping traffic

The network is as follows: Two Default Gateways exist on the network - one which provides connectivity to the an MPLS with several subnets. Let's say 10.0.0.2 Another which is a Cisco Firewall, on ...
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0answers
22 views

OpenVZ container(s) and NAT

I have been trying to days to solve my NAT issue with OpenVZ. I have used their guide on their website/wiki, however I just seem to be unable to get it to work. My Linux box is running on CentOS 6 ...
0
votes
1answer
59 views

Custom Live Boot PXE ISO Script

Currently I am using an open source PC auditing software called Open-Audit to audit PCs my company receives off lease from school districts. The software uses snmap to pull hardware information over a ...
0
votes
1answer
30 views

serving html remotely from mac os x [closed]

TL;DR: simple HTTP server is accessible locally, but how can I make it available remotely in order to view the served files from another computer on the network? I'm using a zero-configuration ...
0
votes
1answer
35 views

ipv6 static routing is not working

wondering ipv6 static route default route nothing working, only can ping the directly connected interface, but sh run command gave the static routes which I created to other networks, but on the sh ...
0
votes
1answer
25 views

Troubleshooting poor point to point (over internet) bandwidth between two machines

My problem started out as poor bandwidth between a 64 bit Win 7 Home OpenVPN server in location A (Northern Europe) and a Win 7 or Linux Client in location B (Southern Europe). Location A has FTTC ...
2
votes
3answers
109 views

DNS loadbalancing

I have several server. We want set up new big service (word 'big' came from my boss :P ). I want use two Cisco LoadBalancer ACE 4700 but what will it happen if one of ACE is down? So I want setup DNS ...
0
votes
2answers
48 views

Routing DNS requests via DNSMASQ [duplicate]

Ubuntu 14.04 | dnsmasq My goal is to setup a catch-all HTTP server using an Ubuntu 14.04 workstation as DNS resolver. I have installed dnsmasq on my Ubuntu 14.04 OS using apt-get install dnsmasq and ...
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2answers
44 views

How to use a server as a “tunnel” in between the clients and the router, in a small network?

Consider a small network with 1 router (192.168.1.1) and clients (192.168.1.x). The router (OpenWRT) provides Ethernet LAN and WiFi for the clients, to connect to the Internet. Now, I want to use a ...
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votes
1answer
27 views

Why do network connections hang? [closed]

We've all had the experience: you click on a link, and your browser just... sits there. After 10-15 seconds the page might eventually load, but it's usually the case that if you just stop the page and ...
-2
votes
1answer
44 views

Which VLAN should a secondary server NIC go on?

We have just upgraded our SAN backend with 10 Gbps connectivity and we have a few Windows servers that currently use a 1 Gbps connection, which we would like to upgrade by adding 10 Gbps NICs to. Part ...
4
votes
6answers
10k views

Does a single LACP channel over multiple switches increase redundancy?

I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been ...
1
vote
8answers
14k views

how to get MAC address of remote computer

I have specific situation. I want to get MAC address from a remote computer, which is not in domain. I know the hostname and IP address of the remote computer. The IP Address of my computer is ...
0
votes
2answers
4k views

Sub-interface already in use on another host - brand new interface

I created a sub-interface on a RHEL box, eth0:1, and copied the eth0 config and changed all the settings to reflect eth0:1 and the IP address. However, when I issue ifup eth0:1 I receive this error: ...
1
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0answers
98 views

Automounted AFP home directories are owned by root (OS X Yosemite client, Linux Servers)

What I am trying to do but can't get to work I am trying to set up network users in Yosemite clients with their home directories on kerberised AFP. I am using automountd to have the home directories ...
-6
votes
1answer
14 views

Finding device network disconnection location (which hop failed) [closed]

If you can't connect to the internet and you know the problem is as simple as one of your devices being disconnected along the line which of the following would you use to find out which? You also ...
0
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0answers
18 views

GeoServer Slowly Requests to Remote DB

I have two servers, one for database (S1) and the other one for my web app & GeoServer (S2). Both inside network A. Application works fine on S2. Retrieving WMS and GWC layers from S1 through ...
14
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7answers
22k views

How to tell if it's your problem or your ISP's problem

I originally titled this "how to tell if your internet is down or your network is just screwed up" and Jeff's AI said that this questioned would probably be closed. Nevertheless, someone here is ...
2
votes
2answers
101 views

How do you ensure that two data network links have no SPOF?

How do you ensure that two data network links have no SPOF (Single Point of Failure)? We are working on a datacenter network connectivity and need to ensure that there will be no SPOF. We will have ...