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

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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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1answer
17 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
19 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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1answer
28 views

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

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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0answers
15 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 ?
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1answer
19 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
35 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 ...
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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 ...
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0answers
12 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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1answer
47 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
36 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 ...
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0answers
9 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
40 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 ...
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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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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 ...
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 ...
2
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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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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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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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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
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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votes
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? ...
16
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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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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. ...
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2answers
26 views

Same number of clients - multiple WAPs vs Single WAP

We purchased a device that acts as a WAP through which you can connect a mobile device and share its content onto a projector or tv. My question is - if we have multiple deployments of this device, ...
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Avaya 4850 GTS & VSP 7000 - setting up a fibre trunk, no MLT

I'm a junior network/sys admin, and I'm stuck (and my seniors aren't sure what to do). I have a VSP 7000 switch which is a core switch. And a 4850 GTS switch which is like access switch. The switches ...
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1answer
17 views

Running OpenVPN on Xen node causes guest VM to view all inbound connections as originating from the node IP

I have two node servers running Xen 4.2 -- I'll call them Node A and Node B. Node A is running OpenVPN as the server. Node B is running OpenVPN as the client. Both nodes host a number of Xen guest ...
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0answers
4 views

filtering in traffic shaping

I am using a traffic shaping by HTB and IPhashing filter in an organization with 10500 users. In my project i want to control bandwidth per IP so I created for each IP an individual class. HTB ...
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0answers
7 views

How to make TCPFlow to not store package body?

Is it possible to configure tcpflow to store only package headers without package body? My log simply explodes in production.
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0answers
5 views

New HP Network Printers Problems with Barcodes [migrated]

a few days ago, i replaced some old HP Laserjet 1300 printers with new HP Laserjet Pro 400 printers. As manufacturer, driver and settings are the same (i checked it multiple times) i didn't see any ...
2
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3answers
54 views

Scanning network devices by mac address

I work in the security devices industry and most of my work relates to IP cameras. Each camera manufacturer has their own software that scans the network for their cameras and gives details about ...
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2answers
34 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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0answers
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size of Network Packet in linux [closed]

I would like to understand what is the default network packet size for an inbound and outbound in linux. What it has to do with MTU on the nic. Does a NIC speed determine the packet size or kernel ...
0
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1answer
44 views

Server network setup with 2 NICs

We have a debian server server with 2 NICs. The Server should be configured with 2 IP addresses, one internal address for the communication in our LAN, and one public IP accessible from the internet. ...
-3
votes
0answers
79 views

Why do I keep getting “403 Forbidden - nginx/1.6.2 (Ubuntu)” when visiting any of my sites? [closed]

Why do I keep getting "403 Forbidden - nginx/1.6.2 (Ubuntu)" when visiting any of my VPS hosted sites? I have recently changed to nginx installation from Apache2 on my Ubuntu setup on my ...
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0answers
20 views

Xen: network between dom0 and domU does not working, while network between particular domUs does

I am unable to establish communication between domU and dom0. I have two domUs and they are able communicate between each other. Dom0 is connected to Internet. I just need network between dom0 and ...
3
votes
1answer
44 views

How to test iptables settings by port scanning?

I want to test my iptables and prove that it only allows traffic for given Protocol / Port - combinations. How I can use as a target for a port scan?
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2answers
24 views

Discover webserver on a network [closed]

I am building a small linux box, which will be running a webserver only. The purpose of this little machine is to be put into a small, temporary network at a temporary location with no access to the ...
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0answers
13 views

Internet is not working without proxy [closed]

Internet is not working without proxy, but its works with proxy. What can be the issue for this problem.? I need to connect without proxy. Please let me know how to solve. Thanks in Advance.
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 ...
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1answer
31 views

Linux kernel behavior when dealing with colliding subnets

I'm using openconnect to connect to my office VPN. They push some pretty crappy/aggressive routing rules allocating ALL of the private IP address spaces >.< After I connect to my office VPN, my ...
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0answers
20 views

Unable to set a bridge over bonding on Debian

I have a Debian 8 Jessie machine with two interfaces (eth0 and eth1) bonded in balance-rr mode (aka 0). It works smoothly, but when I try to set up a bridge on it, it doesn't work. My ...
0
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1answer
28 views

Utilizing A Secondary IP On A NIC In A Windows Cluster

RELEVANT INFORMATION I have a windows cluster with 3 nodes in it... Node1 Node2 Node3 I have 4 NICs on each node... NIC1_Host NIC2_Virtuals NIC3_Cluster_HB NIC4_Live_Migration This is the ...
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0answers
17 views

Can't connect to Windows Server 2012 Virtual Machine in Red Hat 6

I have installed a WS2012R2 virtual machine using KVM on Red Hat, It has a bridge connection, Both (Host and Guest) have public IP addresses, both have internet access, both can ping any ip address or ...