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

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When do Ethernet broadcast (ff:ff:…) and IP network broadcast (e.g. …255) scopes differ?

Is there any option that a ethernet broadcast does not reach the same hosts as a IP network broadcast, vice versa ?
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13 views

Creating a local wireless network, without any external hardware

Whats the simplest way to create local wireless network, with nothing other than two laptops ?
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8 views

Allowing services to specific hosts using firewalld

Introduction On my database server (CentOS 7) I want to allow access to port 3306 (MySQL) from specific web front-ends (10.10.40.6 and 10.10.40.7 in my example). On top of that I want to allow access ...
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1answer
896 views

Route outbound connections from local network through VPN

I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via ...
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0answers
32 views

Connecting 2 sections of a guest network using a pair of layer 3 switches

I have 2 subnets, these are physical sites which are connected with a point-to-point fibre link, 10.0.0.0/16 is our main site with our main gateway, 10.2.0.0/16 is the second site which sends all ...
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3 views

SoftEther intercommunication between softether clusters setup

Hi i have setup a minimal configuration of SoftEther with 3 regions. These three regions have internal communication between each other. However now i would like to implement load balancing, thus i ...
6
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3answers
1k views

Why would ping give me fast rtt values, but take a long time for each response to come back?

I've got a bit of a basic networking question here regarding ping. When pinging a particular host on a completely different subnet, I get a response like this: PING myhost.example.com (1.2.3.4) ...
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2answers
15k views

When do DNS queries use TCP instead of UDP? [duplicate]

Possible Duplicate: Is it true that a nameserver have to answer queries over TCP? I know DNS uses UDP for most of its queries, but in what circumstances will it use TCP instead?
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7answers
22k views

How to use a Tone Generator to trace a network cable

We have a tone generator kit for tracing network cables, but I am having trouble using it correctly. The tone generator end plugs into the network cable I am trying to trace, and then I assume I ...
0
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0answers
15 views

How to configure host only adapter for solaris 11 guest in virtualbox

Usually when I create a new Linux VM I enable 2 adapters in the virtual machine, the first one connected to NAT (for the internet), and the second to the Host Only Network adapter so I can ssh to the ...
1
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3answers
1k views

Ubuntu Server, 2 Ethernet Devices, Same Gateway - Want to force internet traffic through 1 device (or at least allow it to work!)

I have a Ubuntu 10.04 Server with 2 ethernet devices, eth0 and eth1. eth0 has a static IP of 192.168.1.210 eth1 has a static IP if 192.168.1.211 The DHCP server (which also serves as the internet ...
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1answer
44 views

Nginx 1.8 Configuration Problems

Here is the problem : (I'm new to NGinx, read about it, but didn't find my working solution yet.) I'm on a Windows system. My projects file system is located there : E:/www/ here is a project ...
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9 views

Assign physical interface to docker exclusively

I would like to run a high performance network test in a docker container, and do not want the overhead of bridging (so pipeworks won't work AFAIK). I would like to assign (in addition to the normal ...
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2answers
21 views

Cache HTTPS Static Assets

I will be managing a network for an African College with limited Internet access. To help reduce network traffic and increase browsing speed, I was hoping to setup a Squid like caching server. ...
1
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2answers
1k views

How can I configure my network to allow bi-directional traffic between two lans?

Here's my current setup: (and it may require reworking): 2 LAN networks - 192.168.41.0, 192.168.21.0 2 Public IP's (they are assigned to us by specifying MAC Addresses - not subnetted) ...
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0answers
30 views

Multiple DHCP Offers - Which is selected? [on hold]

I have created a testing scenario in VMWare for a man in the middle attack using DHCP spoofing. It's for a college project. Windows 8 machine bridged to host adapter Kali linux bridged to host ...
2
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2answers
1k views

IP Conflicts from mikrotik router for multiple ip addresses (that it isnt assigned)

I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. ...
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0answers
8 views

How to set up Kali in VirtualBox with dsl modem? [on hold]

Anyone can help me to get internet inside my Kali? On another VB host I have Windwos 8 and all works fine here is ipconfig: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : ...
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2answers
39 views

Can I connect many switches to a switch? [on hold]

I am trying to make a campus network.I haven't any experience. In campus,there are center building and many buildings.I use many switches(for pc,phone,sec-cameras) in a building.And I want to connect ...
0
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2answers
873 views

Unable to access different subnet

Router ip: 192.168.3.1 Windows server: 192.168.3.50 (WLan) and 192.168.2.1 (LAN) PCs: 192.168.2.x I am able to access 192.168.3.50 from laptop (in 3.x network) but unable to access through other ...
13
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4answers
20k views

What happens when wifi channels overlap?

There are many pages on the web advising the use of wifi channels 1, 6 and 11 only, so that your wifi channels don't overlap. Obviously this makes sense when you only have your network do deal with, ...
3
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2answers
963 views

No network loopback device after security update ubuntu 12.04

I've had Ubuntu 12.04 on a server for the last several months, with everything working fine. Last night I did an aptitude update && aptitude safe-upgrade to bring in all the latest security ...
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1answer
1k views

xen Dom0 network setup on ubuntu 12.04.1 LTS

I read a lot of tutorials (or at least try to be) but none is able to explain well how to configure networks for xen host. my Dom0 has two interfaces eth0 (real interfaces) and virbr0 (I guess was ...
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0answers
4 views

How to set up a simple Cisco ISG config for controlling internet access

First off, here is my config so far. http://pastebin.com/fV2NGCE2 I've gone through a few guides online and the 15.2s manual and the xe3 manual for Cisco's ISG (intelligent services gateway) and ...
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0answers
20 views

Multi IPs on a Xen VM with bridging

While I am fairly new to XEN (running under Ubuntu 14.04) I've not had any real issues until now. I have set my networking using bridging and that has worked well for many different machines until ...
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0answers
15 views

Filter Traffic Between Virtual Machines

I have a machine with Fedora 21 which acts as a host system for two virtual machines. The VMs are made up using QEMU/KVM/libvirt/virt-manager. One VM is running a webserver, the other VM acts as a ...
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2answers
52 views

Exposing private network ip

I have the following setup: Box A eth0 - 192.168.1.101 eth1 - 10.10.2.1 Box B eth0 - 10.10.2.2 Box A has internet access through eth0. I want Box B to be visible on the 192.168.1.0/24 network, so ...
2
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2answers
54 views

Adding a virtual NIC to a 2008R2 server makes internet unreachable, why?

I currently have a Windows Server 2008R2 box with a single physical NIC. For what I want to do I need two network adaptors in the box. To accomplish this, I added a legacy hardware device "Network ...
3
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1answer
910 views

Windows Server 2012 Port Forward for Specifc Host

I am trying to have a specific host be redirected to another port when trying to access a service on port 80. So, when the client (192.168.1.22) requests a connection to the server (192.168.1.10) on ...
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0answers
29 views

DNS not working with Ipv6

I'm trying to configure bind for ipv6 protocol.I have added the entries to the zone and configuration files but still the ipv6 IPs are not returned when i try for nslookup.Can someone guide me to ...
2
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0answers
55 views

Adding extra IP to NIC causes connectivity issues for main IP (Win Server 2012 / IIS)

I am experiencing a very odd situation: I have set up 8 IP addresses in a single NIC (plus it's main IP) for use as a web server - and have 8 websites happily running in IIS8. (The server in ...
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1answer
2k views

Cannot connect to Openstack Instance via horizon, but SSH works?

I've got an OpenStack deployment running inside a VM for testing purposes. My setup is as follows: Host Ubuntu x64 with Virtualbox -> Guest Ubuntu x64 with OpenStack -> Ubuntu X64 Server Test ...
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3answers
2k views

Is it possible to tell whether two IP addresses belong to the same server?

Given two public IP addresses and the knowledge that are both on the same /27 network, would it be possible to determine from a remote location (i.e. different country) if they belong to one or two ...
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2answers
1k views

Access print server through firewall?

At my workplace, we have two fiber networks setup, one for the business network and the other for process control (industrial manufacturing). On the business network, there is a standard print server ...
1
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1answer
21 views

iptables 'rewrite' requests on a certain port?

Alright, my situation is basically this... I have a box that's acting as a router, with 2 interfaces, eth0 and eth1. eth1 is my uplink, that is it is the interface through which the box is obtaining ...
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0answers
18 views

RDP connection gives nca_s_fault_access_denied [migrated]

I have 2 PCs on the same network with fixed IP addresses and firewalls turned off. Windows 7 Professional and the service running on a Windows 7 Enterprise editon. System running with DCOM service. ...
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5answers
13k views

Network Error: no buffer space available

After some time of running fine, one of our Windows XP SP3 machines does not open some(!) new TCP/IP connections anymore. Putty says Network Error: no buffer space available, IE won't open any new ...
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2answers
2k views

Windows Server 2008 network speed slow, Xen 3.4.3 HVM ISO

I've setup a VM running Windows Server 2008 on a host node running Xen 3.4.3-5 and the following kernel: 2.6.18-308.1.1.el5xen #1 SMP Wed Mar 7 05:38:01 EST 2012 i686 i686 i386 GNU/Linux The network ...
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1answer
1k views

ipconfig slow to complete

Does anyone have any idea why ipconfig on Windows XP might take a 10-20 seconds to finish? It’s causing a timeout issue for me in an application.
6
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5answers
4k views

Copying packets from an interface to another

I have a Linux system (let it be A) with 2 ethernet cards, namely eth0 and eth1 which are attached to two totally unrelated LANs. Basically eth0 is used for normal application traffic and eth1 is ...
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2answers
3k views

Unable to connect via NetBIOS Name

I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] ...
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2answers
13k views

Fortigate 200A firewall CPU high resource usage

This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something ...
0
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0answers
7 views

VMWare Fusion 7 - Troubleshooting Networking issue [closed]

Im running fusion on my OSX 10.10 (Yosemite). My VM is a Win 8.1. Because of the "developer" nature of this VM, I need to be able to access services it provides (eg: IIS+Web API) from other network ...
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0answers
12 views

Openwrt bridging issue between wireless and ethernet port [migrated]

I've this scenario: an AP connected to the STA wirelessly, the AP is a DHCP server I have following configurations in /etc/config/network of the AP: config interface lan option ifname 'eth1 ...
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2answers
32 views

Use a specific outbound IP with Docker

I have 3 network interfaces: docker0, eth0 and eth0:0 (alias). auto eth0 iface eth0 inet static address 1.2.3.4 netmask 255.255.255.0 network 1.2.3.0 broadcast ...
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1answer
43 views

Email storage server - NAS or SAN? [closed]

I'm looking for storage server that could store ~34TB (34 SSD disks of 1TB) of emails. I'm thinking about two NAS QNAP storage servers, but I'm not sure if it's OK to use NAS instead of SAN. Any help? ...
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1answer
36 views

Setting a default gateway which is on a different subnet

I work in a company which uses 3 subnets, 10.0.0.0/16, 10.1.0.0/16 and 10.2.0.0/16. The 3 subnets are connected using layer 3 switches (10.0.100.200, 10.1.100.200, 10.2.100.200), all of the machines ...
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0answers
32 views

How to build a Raspberry Pi CubeSAT? [closed]

Guys I want to build a demo Raspberry Pi CubeSAT setup. This thing I need to setup on my home-lab to research on TrafficSqueezer WAN optimization over CubeSATs. Does anyone did CubeSATs or experience ...
2
votes
1answer
26 views

Identify individuals behind SLAAC addresses

We're operating an IPv4 network (on ethernet & Wifi) in a student dorm with ~200 users and want to deploy IPv6 in the long term, with stateless autoconfiguration on a single /64 prefix. ...
0
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2answers
69 views

Network account problems with mac server OSX 10.6 Snow Leopard

Okay the situation is this. Yesterday my company changed our dns server, because our former one, was too unstable to work with. anyway today i went to one of our mac server, because it needed to be ...