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

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Load balance 2 wireless adapters on 2 different computers (ie. w/NLB)

I have 2 physical servers running 2012R2. Each box has its own wireless nic. I also have 1 SSID to which both servers/WLANs connect to. While trying to setup NLB, I noticed the Wireless NICs didn't ...
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iptables blocking script using arp table lookup

I need to block certain hosts (multi-OS) on our LAN from gaining internet access. I decided to try and block certain hosts by mac address via iptables but I can't use the mac address of the ...
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1answer
31 views

Private VLAN on single port

I am trying to separate a group of computers (5 to be exact) from an entire network, but they still need to login from ad dc. Those computers are on a different floor, they have static IPs, and they ...
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42 views

route output traffic from specific NAT'ed VM via ip alias

In a dedicated server with several containers behind NAT, I'm trying to route the output / outbound traffic from one of the containers through a specific virtual interface attached to the main ...
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73 views

DHCP server on subinterfaces

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
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75 views

Is the MAC address of the physical host used in a virtual environment?

In an environment with virtual servers, is the MAC address used to communicate, the MAC address of the physical host, or the MAC address of the virtual adapters. If it's is the virtual MAC address how ...
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61 views

EC2 Network Interface with secondary Private IP, not showing on Interface in Windows

I have a windows server 2012 r2 instance on EC2 under VPC, I have two Network Interfaces. The Primary Private IP is shown in windows for both. I have a secondary IP address on one of the network ...
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69 views

How will the LAN to LAN firewall rule affect the traffic in the rest of the network

I have a following network setup (of course a bit modified from the real situation) I would like to setup a LAN to LAN rule on the ZyWALL firewall so that only certain ports/ip adresses are allowed ...
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34 views

Enlarge IP Network Address Space

Our small company uses a 192.68.0.0/24 network. As there are only 256 IP addresses, we will be running out of IP addresses soon. I wonder about the best strategy to change the network. Some devices ...
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41 views

Is a “bridging device” required to join two networks?

We're considering two NBN fibre connections to the Internet (NBN is a fibre connection for those of you not living in Australia), with each connection having it's own subnet. The first connection's ...
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76 views

Windows Server 2012 - Prompt on accessing network resource from server hosting resource

Here's an odd one that I've not been able to crack. For my home lab setup, I've got two near identical physical servers that run Windows Server 2012 R2. The goal of my home lab setup is to be able ...
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28 views

Windows 7 x64 Enterprise all network printers greyed out on reboot

We've got a bunch of network printers on SL7 running CUPS. These are distributed via GPP printers. This all works with older images. In the last week or so, new installs from the same base image are ...
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130 views

VPN (PPTP) connects successfully but unable to ping some devices in the LAN

My working company has this router (Cisco RV042G Gigabit Dual WAN VPN Router) and it has the IP 192.168.1.1 with subnet mask 255.255.255.0. It has 3 devices directly connected to its LAN ports, an ...
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1answer
105 views

Iptables LOG rule inside a network namespace

I'm trying to setup iptables rules for a docker container. I'm using nsenter to execute the iptables command inside of the container's network namespace: # log access to port 8080 PID=$(docker ...
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1answer
160 views

Multiple Websites on Multiple Servers behind One Public IP

Brief I’m currently working on a project to bring two of our hosted servers (one email, one web) in-house to run alongside our other web server. Hosting one web server is fairly straightforward, but ...
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96 views

DNS: Root hint server 2001:500:1::803f:235 must respond to NS queries for the root zone

We are using IPv4 in our company. Our ISP does not provide IPv6 and this won't change in the next years. The Best Practices Analyzer (BPA) of our Server 2012 R2 DNS server warns about the IPv6 DNS ...
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75 views

AWS SSH Session getting closed by Server intermittently

I have connected to the AWS EC2 Ubuntu instance using putty on Windows 7(ppk authentication). Most of the time I'm getting this message on putty: Network error: Software caused connection abort. But ...
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107 views

Trouble understanding how to setup network Bridge on Ubuntu 14.04.2 to act as a web content filter

I am trying to build an Ubuntu server to act as a web content filter, using Squidguard and Dansguardian. There are great resources such as this: ...
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47 views

Hide OpenVPN client's IP

Is it possible for a OpenVPN server letting clients communicate with one another and they do not know other's IP in VPN? My VPN server is ubuntu 14.04 32bit
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Hyper-V, Subnet Masks, External IP Addresses, Hetzner [closed]

I am pretty new to this so I am going to try and explain this as best as I can. All Servers I have dealt with in the past have always had an internal IP address, the external access has always been at ...
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1answer
68 views

Can't get iptables working in VPS - state and conntrack not possible

I've been browsing and reading documentations all night and I can't figure out any solution... I'm trying to get iptables working on my VPS (Debian 7). But I can't get established connections ...
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1answer
50 views

What is wrong with my simple dnsmasq setup?

I have dnsmasq running on a server (its IP is 10.10.31.22), let's say its hostname is mydns here's the dnsmasq.conf: domain-needed bogus-priv local=/argonath.mydomain.com/ interface=eth0 ...
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1answer
84 views

Linux TCP connection establishment is very slow

I'm not sure what's wrong, but every outgoing network connection is very slow on my server (called dikkenek in the snippets below). It seems it's at the connection establishment. bicou@dikkenek:~$ ...
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45 views

Static IP Forwarding on OpenWRT

I have a /28 block of static IP's that my ISP provides. Lets say x.x.x.x/28. The new building we are in has a OpenWRT router that I want to configure to forward those IP's to specific servers on the ...
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172 views

Limiting bandwidth on Ubuntu Linux

I am in the situation where I have to simulate a P2P-environment (for my masters thesis in computer science). To do that I am using Docker with Ubuntu to create a bunch of virtual machines that is ...
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168 views

First and last IP address of the network 192.168.176.0/23 (subnet 23) [duplicate]

Let's have the following address of the network: 192.168.176.0/23. What are the first and last IP addresses of this network? Following this answer http://serverfault.com/a/327782/288201 I assume ...
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47 views

Reaching out DHCP relayed hosts

I have one primary server (DHCP) and one secondary (DHCP-RELAY). Majority of hosts are served from primary (wirelessly), however there are a few (wired ones) which get their IPs from secondary. ...
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69 views

Hyper-V windows server 2012 - Download speed not more than 10KBps from Virtual Machines

I have installed HYPER-V rule on my windows server 2012. Hyper-V created one virtual adaptor and it is linked to the physical adaptor (only one physical adaptor is there) I used powershell to enable ...
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2answers
49 views

Is There A Way To Implement WINS-like Functionality Without WINS?

A company 'somecompany' is retiring WINS (Windows Internet Name Server) support. This means that where the IT staff used to be able to type: ssh somehost They now have to type: ssh ...
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1answer
78 views

dual-homed Centos 7 cannot be ping'd or ssh'd from some on LAN, sees ssh connection refused on one subnet

I have 2 subnets, A and B and a router connected to both A and B and the WAN. I have 4 servers dual homed on subnets A and B, 2 of them are Mac OS and 2 of them are Centos 7 (1503). They are all ...
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30 views

Network drive not available after IIS installation [closed]

After installing my IIS I could not connect to the internet with my browsers since they were looking for a proxy apparentely the IIS set itself (127.0.0.0:8888) as proxy server. I corrected that but I ...
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1answer
41 views

How to forward hostname based request to a specific docker container

I'm trying to use hostname based connecting to a docker container. i.e: I connect my browser to web01.docker.example.org (assuming a wildcard DNS record on *.docker.example.org pointing to my docker ...
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1answer
73 views

Fibre Link Warehouse Contingency Plan Advice

Hi I am looking for some advice and best practices for the contingency plan of our Fibre Link data connection between Offices and the Warehouse which is approximately 100 metres away over a river but ...
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1answer
67 views

How does an AWS VPC instance route traffic internally and externally over 1 interface?

An instance brought up in a VPC with internet access is able to respond to traffic directed to an internet routable public IP assigned to it, as well as the internal subnet IP it has on it's only ...
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2answers
50 views

Adding registry values to all users on domain

I have four registry values I would like to add to both HKCU and HKLM for all users connected to a network domain. Currently we are manually running a batch file on each of the computers when ...
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28 views

Dell M6348 switches, how to disable Mac address learning for specific VLAN

I'm trying to disable the Mac-Learning for a specific VLAN on this switch. I was able to do the same thing on my Juniper switches with the command: no-mac-learning; however that doesn't seem to ...
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1answer
27 views

unable to change environment variable using setenv()

I have an a member server with a windows PDC with active directory. Security=ads. I am trying to set an environment variable(credential cache) using C: setenv("CCACHE","cache_name",1); However, ...
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1answer
18 views

Why would a portion of a website work outside my LAN, and not inside it?

So we have a website at work that no one inside the work LAN can use. Our customers can use it. I can use it if my phone is on LTE. I can't use it on WiFi, through an ethernet connection at work, or ...
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76 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 using this guide. In the neutron configuration I am using VLANs for both tenant and external ...
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1answer
46 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 ...
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1answer
46 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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44 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. ...
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1answer
57 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: ...
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2answers
32 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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64 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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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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67 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 ...
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1answer
111 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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31 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. ...
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264 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 ...