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

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Choosing port numbers in the range 10000-19999

We have a Spring Boot application, which we control, running on given development and production machines. We use "standard" port numbers such as 8080 (Tomcat), 8686 (JMX) and the like. We don't ...
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14 views

Datastores Occasionally Disappear on vSphere Client

I'm currently running several virtual servers and connecting to the vCenter using the vSphere Windows client. We're connecting with to a datastore on another server which has a separate folder for ...
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3answers
257 views

When the internet is down, so does Active Directory?

I am setting up business servers for a small office use with 5 users / 5 devices or so. Nothing elaborate here. I've set up a SINGLE Lenovo TS440 server (single NIC) with Windows Server 2012 R2 ...
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1answer
34 views

Broadcast ARP query to all nodes?

I am trying to broadcast an ARP query. I want to get every node's ip and mac address updated in my system via this query. So that I can type $arp and see all the nodes on my network and their ...
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0answers
10 views

does WifiDog provocates splash popup?

I plan to use WifiDog for a captive portal proj. But I wonder if there is well a splash/popup when connecting the Wifi as a client. Does WifiDog ensure this OS-reaction ? Thanks
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29 views

Large scale network routing

So i'm having a chat with my development team colleagues and we realise that we actually don't know how large scale networking actually works and this question came up ... Lets say i'm the guy at ...
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0answers
15 views

iptables, redirecting all ingoing connexion

I have this iptables conf on my linux mint... What does it mean ? Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- 13.37.42.0/24 ...
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0answers
18 views

Why would Windows 7 not complete this TCP handshake?

One of our customers is running Windows 7, and cannot reach some of our servers because it seems Windows 7 cannot complete a TCP handshake. Here's a packet trace to one our servers -- note that a SYN ...
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0answers
12 views

iptables : redirect all ingoing traffic to www

I have a Wifi hotspot, made with a linux machine. I d like to redirect any ingoing trafic to my index.php localsite. My public interface is wan0. Is iptables the best solution ? How can I do that ?
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29 views

I can't ping the gateway in debian

Someone Please help. My system is Debian wheezy. the computer also contains Win8.1 and its network is fine. $ping 10.214.52.1 PING 10.214.52.1 (10.214.52.1) 56(84) bytes of data. From 10.214.52.112 ...
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20 views

Why isn't the IP address of router showing in ifconfig? [on hold]

I am looking for the address that I type into my browser to get to the router configuration file. It ended up being 192.168.1.1, as usual. But when I enter ifconfig into the command line, this IP ...
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1answer
19 views

Does switching routers when using same IP cause temp downtime?

Still learning networking but from my understanding MAC Addresses are what route network traffic so if I switch out a router but configure them with the same IP does it take time for the new MAC ...
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25 views

How do I recover permissions after changing the LAN addresses of a network?

Server 2012 R2, SharePoint 2013, TFS 2013 update 4 I recently changed some hardware and the LAN addressing of my network. I went from 192.168.2.x to 192.168.3.x. After I did that, access to ...
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0answers
11 views

Upgrading TWC modem/router with 192.168.0.1 default address on home network with existing Trendnet wired router set to 192.168.2.1 [on hold]

I have a home network with a Trendnet TW100-S4W1CA wired router with a base address of 192.168.2.1, DHCP turned on with a range of 192.168.2.1 - 192.168.2.100, subnet 255.255.255.0. It is connected to ...
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0answers
15 views

Scheduled execution of files over network

forgive my ignorance as I'm a Mac user and have been out of the Windows world for a long time. I am looking for direction on how I might be able to achieve the following: Have a windows computer ...
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0answers
15 views

Setting up Bridge

I'll be setting up a bridge network for kvm in CentOS 7. The thing is the server will be relocated to a new office in a few weeks, but I need to get it up and running now. I don't know if our ...
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1answer
30 views

Windows 7 pro- Normal boot up, but slow network login

got a question I'd like a little advice on. I have a user on out network who's got a laptop that boots up at a normal speed to the login page, but once he enters in his login credentials the system ...
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1answer
16 views

Freeradius auth error message

How can I set up a message sent to the user when enters a bad credentials to WPA2-Enterprise network? I am now using Freeradius and when I enter bad password, it says nothing, but Windows throws "You ...
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0answers
10 views

DSL modem in bridge mode but router not accessible from the internet

I have a DLink ADSL modem which I have put into bridge mode and connected to a Fortigate 200A firewall. The Fortigate is able to connect through PPPoE and receives the static public IP. I can browse ...
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0answers
18 views

How to foward 2 users requesting 2 different URLS(ports) to docker containers managed by apache in docker (beginner) [on hold]

So. Lets first kick it off by me saying im not a networker (but learning to be one), but i have a problem related to it. If you have any answers, would you please provide it in laymans terms (Terms ...
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0answers
44 views

How to find IP address of ADSL modem? [migrated]

Our fall back Internet connection uses a SpeedStream 4100 modem, which just broke, so I have replaced it with a new one. I need to configure it to bridge mode, but I can't even find its IP address. ...
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2answers
39 views

If network card supports 802.11n, does it mean it supports 5ghz band? [on hold]

I've gotten a new router that broadcasts 2.4ghz and 5ghz bands. But my desktop could only see the 2.4ghz connection. I read from a website that as long as my network adapter supports 802.11a or ...
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2answers
50 views

Reaching system behind router

I have a situation where I have a small server appliance that I want people to be able to just plug into their router, turn it on and let it work. When the appliance starts up it determines its lan ...
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15 views

TC fails to shape traffic with DRR

I try to control outgoing traffic from my server. I want to have several classes with different QoS parameters. For the scheduling I'm using DRR. The following commands (should) create a Tree of ...
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1answer
25 views

NAT TCP/UDP Connections With iptables on AWS

So I've got 2 instances on AWS set up so I can SSH into them directly (A, B) from my home machine C. But I want to set up box A so that I can forward certain UDP and TCP connections from it to box B. ...
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1answer
25 views

Creating a virtual network for KVM guests spanning multiple host machines

I have 5 physical machines running Ubuntu 14.04, all of them are together in a network. These all have static IP addresses. Each of these machines has 1 to 4 virtual machines via KVM/QEMU running ...
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0answers
18 views

How important is to keep up to date with cisco certifications and training books? [on hold]

A coworker gave me book on Cisco CCNA ICND exam 640-811 training. I'm new to networking and thinking about getting certification if this book has enough relevant information to help me pass.
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1answer
27 views

Binding local network machines to global doman names via dnsmasq. Possible? [on hold]

In my current setup, I've got a Thomson TWG870UG modem-router(internal DHCP server disabled) with a couple of home network machines connected to it via both ethernet and wlan. One of these machines ...
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24 views

The ping command cannot be found by my shell [on hold]

I am trying to run ping in the terminal, and it seems the program has disappeared. I am running Mac OS 10.10 Yosemite. I receive the following output from my shell: command not found: ping I used to ...
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1answer
19 views

Egress Interface Routing - Potential Solution?

We have an ISP (ISP1), with a router maintained by the ISP. We are bringing up a 2nd ISP (ISP2), with routers we will deploy and maintain. We'd like to gradually migrate services from ISP1 to ISP2, ...
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1answer
28 views

How to host JSON data for a website's JavaScript [on hold]

I am about as green as they come as far as networking goes so I am asking for a little latitude. I have a program running on a Windows 2012 server and I need to send a couple bytes of text from it to ...
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70 views

How to simulate network partitions on windows? [on hold]

Working on a project which implements a clustering algorithm. One important property of the clustering is to respect guarantees when face a network partition. To prove that clustering works I need a ...
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19 views

1 modem connect with 2 device, how to keep them in the same network? [closed]

My ISP provide me a moderm that has 4 input and I can plug lan cable in it the modem model: http://huawei.com/en/products/fixed-access/fttx/ont/hg863/index.htm So I have attempt like this before ...
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1answer
26 views

Cisco Router NAT does not work

I have an active internet connection from provider on festethernret0 and also have vlan1. I need to have an internet connection from festethernret0 to my vlan1. I am doing it this way: access-list 2 ...
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1answer
34 views

127/8 address is not passed to IP stack?

I send IP/UDP frames using raw sockets with destination IP address from 127/8 range - e.g. 127.0.0.6. So, packets are sent over the network OK (checked using tcpdump on the target device). But on ...
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1answer
26 views

Time Between successive DNS queries.

Using a PC running Ubuntu 14.04. I'm testing web browsing using a very low speed and low data rate link. My system is congested with DNS queries (and other types of packets like TCP re-transmission). ...
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1answer
33 views

When connecting to localhost, does a full SYN, SYN-ACK, ACK handshake still occur?

This question is addressed, primarily for Linux. While I could find the answer myself, I'm hoping someone out there just knows the answer implicitly and can save me some time. If I'm connecting to a ...
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1answer
21 views

Static ip routing in Mac OS [closed]

OS X machine with x2 NICs connected (en0 and en1). en1 is the default interface and connection to the internet via gateway 192.168.1.254. My IP is 192.168.1.65 en0 is a private connection with ...
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12 views

Route only on output chain?

I have two machines A and B. I want to send iperf traffic from A to B, but first have it route through a userspace program on A. I did this with a tunneling device: therefore, I used the command ip ...
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1answer
18 views

On a Linux NAT host, late duplicate segments cause connection resets

https://www.cloudshark.org/captures/6f185eb12e97 172.30.5.1 Linux vm with bridged networking, running on another server, VM has RFC1918 address only 144.76.103.194 Linux host ...
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1answer
62 views

Limit/Throttle per user OpenVPN bandwidth using TC

I have a group of users connecting to my server via OpenVPN TCP and UDP (2 services). The two services are operating on tun0 and tun1 I'd like to be able to limit each user's bandwidth to say 5mb/s ...
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3 views

SCOM manual dashboard creation displaying blank for network devices

I have successfully installed SCOM 2012 r2 (roll up installed) and able to display all the intended network devices in default dashboard. Now i am going to create manual dashboard for network ...
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2answers
32 views

Is there any disadvantage to putting a modem in bridge mode

In order to prevent the need of port forwarding and double natting I plan to put a modem into bridge mode. Are there any side effects or problems that could come of placing a modem into bridge mode in ...
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0answers
25 views

setting up network that will be sent off [closed]

I'm having to set up a centOS 7 server that will be running KVM to run multi. virtual machines. This isn't anything new, but this server will be sent off to a remote office once I finish setting up ...
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0answers
26 views

Where do I even begin on becoming a SysAdmin? [closed]

So, I decided that I would love to spend my free time learning about System Administration and I guess becoming one. But, problem is, I do not know where to even begin. I just don't have a clue. I ...
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1answer
44 views

Windows Server 2008 R2 Standard Dropping Packets

I am seeing a strange problem with my WS2008R2 server I believe is related to networking. The symptom is that 6% of all attempts to ping the server using tcp fails. For example, from another machine, ...
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1answer
9 views

Replicate Partition Over Network

Is there a way, in Windows Server 2012 to replicate two same-size partitions over the network in real-time, preferably at driver level (not user-land)? I am asking for two Hyper-V servers. There is ...
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1answer
29 views

Linux: nslookup and dig resolve $HOSTNAME, but ping doesn't

In our private network we have a Consul service discovery server (10.241.232.14) that provides a DNS interface (port 8600). We would like to set our common DNS servers to forward some queries to the ...
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2 views

TPM Drive Encryption / Network Profile

I have the following situation: I have an old application that cannot be rewritten for various reasons that I can't go into. Just noting that refactoring the source of the problem is a total no-go. ...
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11 views

Can't connect to selenium grid on VM?

I have a VM on the same network as my computer. I can remote into the VM and open up the selenium grid console (http://(ip):4444/grid/console) and it appears to be working fine. When I try to open ...