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

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2answers
24 views

Why woud ping fail but not traceroute

For a few days now I started making the interesting observation of a machine intermittently not responding to an ICMP ping, while it still responds to an ICMP based traceroute (specifically set via ...
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0answers
7 views

How to setup web UI to view Master Spark Node from Host Machine

I think the solution is to port forward twice, but I am unable to ssh into the master (source) machine: How do I view the Spark web UI? I am following this tutorial: ...
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1answer
31 views

Dynamic NAT configuration

I am using two routers and one host (computer), I connected fast Ethernet 0/1 of router A with the host and fa0/0 of the router A with the router B I have configured gateway as last resort on both ...
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0answers
12 views

One domain for different machines IPs using subdomains and keep the reverse DNS working on CENTOS

Can i have one domain in one server (one ip) and distribute for two other machines (differents IP) using subdomains and keep the reverse DNS working, like: somedomain.com --> 157.101.184.132 | ...
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0answers
24 views

two gateway two network interface card

I input a new lan cable into my server. eth1 my server main ip is : 192.168.198.134~192.168.198.135 (useing eth0) my server main gateway 192.168.198.1 I get a new IP(192.168.79.39) and new ...
1
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0answers
19 views

debian networking lacp throughput and redundancy

I am encountering the following scenario: Physical server w/ 4 NICs and two HP ProCurve GigabitEthernet switches in a stack $Server runs debian (proxmox ve latest) I'd like to configure the network ...
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0answers
11 views

Trying to implement a program that blocks access to some sites from a server [on hold]

Please I am new to networking, I want to know how I will be able to block access of sites from clients in a network by implementing a program on the server
0
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4answers
77 views

How do I simulate an unreachable host on windows?

I have a windows 8 PC, I am testing a beta program for network socket error handling. One of the ones I am having problem simulating for it to test is host unreachable and network unreachable errors. ...
1
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0answers
21 views

Investigating connectivity issue

I'm trying to set a up a new service on a server that is running apache, however it seems like incoming traffic on that specific port is blocked, although I do not understand why. On the first server, ...
0
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0answers
18 views

Wake On LAN not working for Asrock motherboard [on hold]

Recently I installed and configured a new server for home use. Today I wanted to get the Wake On LAN feature working. For this I undertook the following steps: 1) I enabled WOL in the motherboards ...
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3answers
65 views

how to monitor network traffic in small office [on hold]

We have a small office with around 30 systems . We have an internet connection connected to a router , The router is connected to a gigabit switch . All the computers are connected to that switch. ...
0
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0answers
14 views

FreeBSD Inconsistent Ping

I have installed the FreeBSD in a local machine. When I try ping from another Windows PC(Say A) connected in same local network I am getting different output each time. 1st Ping Pinging 192.168.1.35 ...
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0answers
19 views

Whether mac learning will happen in Cut through switching mode? [on hold]

In cut through Switching mode , switch only look for first 8 bytes , then it will forward to destination. if this is correct, how switch will learn source mac address? Adding additional data ... By ...
1
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0answers
11 views

what the best approach to get the network values on Linux machines [duplicate]

what the major difference between ip addr command to ifconfig -a command? both command are give the same values network IP's ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc ...
0
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0answers
6 views

How can I use host only networking from Vagrant with a static IP?

I have a device on my host operating system with the following configuration: vboxnet2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 0a:00:27:00:00:02 inet ...
0
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0answers
17 views

Detect if a occasionally slow request is caused by network

I developed an SPA web app. It works super fast but for one specific customer it is sometimes very slow without apparent reason. The customer was showing me his screen over skype and I ask him to open ...
0
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1answer
40 views

Figuring out who changed the privilege?

Sorry if this is one of those really simple questions, but I am trying to figure out if there is any way I can see what user changed another users privileges. I have a server running windows server ...
0
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0answers
22 views

openVPN file transfer speed

Problem: File downloads to remote office, pulling data from server are stuck at 128KB/sec (as reported by windows explorer), which is roughly 1mbps. Question: Why can't I get close to remote office ...
2
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2answers
38 views

Sniff outgoing traffic on my server on a SSL channel

Im executing a CURL command on a php application running on my nginx server (centOS). The end point is a https address so the outgoing traffic is of course encrypted. I want to see the network ...
0
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0answers
10 views

logger not logging to remote rsyslogd instance

I am running CentOS 7.0.1406 with rsyslogd 7.4.7 and logger from util-linux 2.23.2. I have two machines connected via a switch. When I try to use logger to log from one machine to the other, nothing ...
0
votes
2answers
43 views

Windows Server 2012 unable to access specific SSL page

This problem really boggles the mind. I have a standard Windows 2012 server with windows firewall enabled. Using Chrome, I am unable to access a certain HTTPS website while other HTTPS websites can ...
1
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0answers
27 views

Setting up a caching system r/w in DCs across continents

We are going to implement a caching system to make our front-end servers which are located in different data centres in Asia, America and Europe can read and write some small JSON data in the shortest ...
0
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1answer
30 views

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 ...
1
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0answers
27 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 ...
4
votes
4answers
712 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 ...
2
votes
1answer
40 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
14 views

does WifiDog provocates splash popup? [on hold]

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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0answers
36 views

Large scale network routing [on hold]

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
18 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 ...
0
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0answers
28 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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votes
0answers
23 views

iptables : redirect all ingoing traffic to www [on hold]

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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0answers
38 views

[solved]I can't ping the gateway in debian [on hold]

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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0answers
20 views

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

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 ...
1
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1answer
23 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 ...
0
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0answers
34 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 ...
0
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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 [closed]

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 ...
-1
votes
0answers
16 views

Scheduled execution of files over network [on hold]

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 ...
-1
votes
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 ...
-1
votes
1answer
42 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 ...
0
votes
1answer
22 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 ...
0
votes
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 ...
-1
votes
0answers
18 views

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

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 ...
0
votes
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. ...
2
votes
2answers
44 views

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

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 ...
0
votes
2answers
53 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 ...
0
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0answers
16 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 ...
0
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1answer
28 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. ...
1
vote
1answer
32 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 ...
-1
votes
0answers
19 views

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

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.
-1
votes
1answer
27 views

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

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 ...