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

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How to speed up Drupal 7 with remote DB (not DNS resolving)

we have Drupal 7 on Ubuntu LTS virtual machine (VMWare) with MySQL 5.1 server on the same physical server, but on a different virtual machine. The Drupal website is currently under development, ...
0
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0answers
20 views

'ss' utility on Mac OS X [on hold]

Wondering if anyone could answer if it is possible to install the 'ss' utility on Mac OS X. I'm looking for an alternative to netstat. I've checked the MacPorts repository and don't see it there As ...
3
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2answers
127 views

What is the proper way to connect cables from a patch panel to a switch when you have more ports on the patch panel than on the switch?

We're in a situation at our new building where we have 58 drops but only 48 ports on our switch. Roughly 40 of our drops will be in use, but it's a random selection ranging from 1 to 58. Typically I ...
1
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1answer
1k views

VTP does not update on client switch

I recently replaced the switch that was functioning as the VLAN server for the rest of the network. Since the replacement however, I have not been able to push any new VLANs to the Client switches. ...
0
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0answers
3 views

OpenWRT: Wireless bridge not working [migrated]

i'm struggling trying to get 2 Routers connected via wireless. What i'm really trying is to extend my home's wireless network coverage by linking a Client router to a Master router which is already ...
0
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0answers
5 views

tenant and external network vlan mapping in openstack

I have deployed openstack Juno on VMware with 3 nodes one for each network, controller & compute following the below link using VLAN network. http://docs.openstack.org/juno/instal... In the ...
0
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0answers
35 views

Deleted file on network. It has disappeared, but still exists [on hold]

I attempted to copy a new version of an .exe file to our company's network. There was an error saying that I did not have permission to perform this. I have full control of the folder and I can copy ...
0
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2answers
1k views

squid specify outgoing network interface

I have a Linux Debian machine with many network interfaces (venet0:1 to venet0:5) running Squid. If I connect to interface venet0:2 squid uses venet0:0 for outgoing traffic but I want Squid to use the ...
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1answer
36 views

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

Can a ethernet broadcast reach not the same hosts as a IP network broadcast and vice versa ? E.g. I have three PCs in a subnet 192.168.100.0/24. If PC1 sends a broadcast ping to networks broadcast ...
0
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0answers
23 views

Weird routing between two networks

My question seems to be quite simple, yet I can't just wrap my head around it. My setup is like this: Server running RHEL 6.4. It has two network interfaces: ib0: infiniband network (plz don't ask ...
0
votes
1answer
17 views

Configure IPTables on KVM host to drop packets on the virtual isolated network

I have two KVM guests, both connected to a KVM virtual isolated network (called virbr1, address space 10.0.0.0/24). For testing a routing solution, I want to imitate a failure of the physical link ...
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2answers
21 views

See stats of data in and out of each connection to a port

I have an application listening to a port. The clients connect to it using http connection. At any given time I see around 3000 connections established. I assume not all these connections are in use ...
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0answers
8 views

Ubuntu 14.04 virtual servers lose network connectivity after inactivity

I'm trying to set up an MDM environment on a few virtual Ubuntu machines, 14.04 LTS running on VMware ESXI 5.5. They're currently very vanilla -- 14.04 mini CLI installs, 20gb storage with 2gb ram. ...
1
vote
1answer
20 views

cURL to localhost gets dropped by iptables

I'm trying to use cURL on the shell to connect to localhost. I'm using curl http://localhost:80 to connect. Unfortunately, it's being blocked by iptables. Here's the error in the iptables log for why: ...
0
votes
1answer
20 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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0answers
16 views

Creating a local wireless network, without any external hardware [on hold]

Whats the simplest way to create local wireless network, with nothing other than two laptops ?
2
votes
1answer
897 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
36 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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0answers
4 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
votes
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) ...
8
votes
2answers
16k 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
18 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 ...
1
vote
1answer
56 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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0answers
13 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 ...
0
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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) ...
0
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0answers
41 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
votes
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
10 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
44 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
votes
2answers
878 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
votes
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
votes
2answers
964 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 ...
0
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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
22 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 ...
0
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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 ...
2
votes
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
votes
2answers
55 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
votes
1answer
954 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 ...
1
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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
votes
0answers
58 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 ...
1
vote
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 ...
16
votes
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 ...
0
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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
vote
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 ...
0
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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. ...
8
votes
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 ...