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 forward a port from guest to host in qemu (kvm)

Is it possible, and how, to forward a port from guest to host in qemu/kvm? Note do I mean (out of) from guest to host, and not from host into guest (that's widely documented). I think I'm looking ...
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101 views

How would I get this routing to work between the two subnets? Unsure if i am over-complicating my network

I am attempting to operate 2 subnets, the first subnet on range 192.168.0.0/24 is free to access anything it wants, including machines on the second subnet. the second subnet on range 10.0.0.0/24 is ...
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16 views

Strange connectionproblems with a samba server

I am at my enterprise which dose not have the best equipment. We recently implemented a new samba server into the network. The server itself (Hardware wise) was already in use but the samba software ...
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13 views

Airodump-ng Not Showing Anything

I am using Kali Linux to test some adapters. First of all, I don't know why, but I have a wlan0 and wlan1. I have tried both of them and I still have the same problem. So far I can issue the command: ...
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39 views

Traffic refuses to go over VPN interface

I've set up a VPN tunnel, and encountered an interesting issue. With fixed routes set up (say, to 8.8.8.8), everything is fine. Packets get sent over that interface, and responses are received. The ...
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35 views

100BASE-FX WDM vs 100BASE-BX vs 100BASE-BX10 - Are they all the same?

Are these three all the same thing being inconsistently named by different manufacturers? 100BASE-FX WDM uses separate wavelengths (1310 nm & 1550 nm) for Tx & Rx over a single strand of ...
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1answer
18 views

How are mirrored packets encapsulated and sent to the receiver?

I'm wanting to stress test an application I've written that takes in mirrored network traffic using Bro and processes it. I'd like to generate the traffic and present it to Bro in a way that's as ...
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1answer
33 views

https not working on OpenBSD 5.8 & 5.9 guests running in VMWare Fusion 8 Pro

The set up is as per title: freshly installed OpenBSD (I've tested both 5.8 and 5.9) are having networking issues when run inside VMWare Fusion 8 Pro (OS X host). Downloading http files of any size ...
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44 views

curl (56) Recv failure: Connection reset by peer - when hitting docker container

From an AWS ec2 instance (which runs docker), I am trying to curl my docker container-hosted web service. Given: [ec2-user]$ docker ps CONTAINER ID        IMAGE                                       ...
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1answer
22 views

utility of using ALL in --tcp-flags in iptables rule

I m wondering what is the difference between the following 2 --tcp-flags rules: 1) -p tcp --tcp-flags SYN,FIN,RST SYN,FIN,RST 2) -p tcp --tcp-flags ALL SYN,FIN,RST
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27 views

Connect two networks from different internet connection

Is it possible con connect 2 different networks from 2 different internet connection (one is ADSL, the other one is 4g). The are both in the same office and each one have its own router.
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62 views

ASA INSIDE to INSIDE traffic being dropped

An ASA 5505 is being used to route between two networks as it contains routes to everything. The following depicts the network topology. I have tried various combinations of access lists such as: ...
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12 views

Find closest (in round-trip time) hosting to a particular serivce behind CDN

I'm using some service which is located behind CloudFlare CDN, and I need to achieve the lowest latency possible in two tasks: receive lots of messages out of WebSocket WAMP subscription with few ...
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1answer
18 views

some http packets not reaching host

we are experiencing a very strange issue with http traffic between 2 machines on the same network: when sending an HTTP request there are some packets not reaching the other host as you can see from ...
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2answers
12 views

Troubleshooting a Web Server with Timeouts?

Have a slightly strange situation that seems like a weird DNS issue. Have a simple office website which has a very simple admin portal type area for staff to login to, and closed off by simple ...
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1answer
46 views

SELinux preventing Asterisk from connecting to IMAP server for voicemail

I am running Asterisk on Fedora 23 and am using the voicemail IMAP module to store voicemails to Gmail. When SELinux is in enforcing mode it prevents Asterisk from connecting to Gmail. Here is the ...
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15 views

DNSMasq lookup dns for domain by interface

I have DD-WRT running dns-masq to use different name servers for a wireless access point. I want to take this one step further but I can't seem to get it working. My current setup (which works ...
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1answer
23 views

SSH connect to FreeBSD9 suddenly started to freeze randomly

I have a KVM FreeBSD 9.2 box for a long time. 5 days ago I had a 2h ssh incoming session on this box with no freezes. No system/soft updates or significant system changes were made. Today I can't ...
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1answer
54 views

Does anyone know how Android detects the presence of internet access over wifi? [closed]

I'm working on a "spoof internet" for an art installation, and I've run into a snag that you might be able to help me with. The goal is to create a wireless hotspot that looks like it has internet ...
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5 views

Home network visibility [migrated]

I am setting up a network in my house and I am facing a problem. I cannot access my home NAS server that is currently under the second router from PCs that are connected to the main router, this image ...
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1answer
25 views

RRAS NAT not forwarding for specific Hyper-V VM's

I have a Windows Server 2012 R2 installation, with Hyper-V, RRAS and NAT setup. I'm having an issue with two of my VM's and RRAS NAT: Essentially, these two VM's will not communicate outside the ...
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26 views

Allow outgoing traffic behind ipv6 firewall behind router

I am working on configuring ipv6 traffic for a project and I am running into a problem. When I try to ssh from the machines that are behind the router into the router, it blocks the connection. I ...
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34 views

Hyper-V Ubuntu can't connect to internet via external network adapter if it also has an internal network adapter [migrated]

I have an Ubuntu 14.04 Server running as a Hyper-V VM. It has an external virtual adapter and an internal virtual adapter connected to it. The external adapter eth0 gets an ip from 192.168.1.x ...
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Can ip address and gateway be the same and can number of clients be increased by changing the subnet mask? [closed]

So I am a newbie just learning networking and was wondering if gateway can be same as the allocated IP address. Also, if I have to increase the number of users that connect to my router (having ...
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25 views

IP Addressing assigned by provider

So basically my vdsl provider has assigned by a range (/30) of ipv4 addresses (79.78.23.14o) yes I noticed the o not 0! Anyway they are refusing to help any further I have .141 assigned to the ...
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30 views

IPTables Configuration to allow all connections, only close/deny once data is sent

I'm looking to set up my IPTables firewall in such a way that: Any new connect() is accepted Once data is received: If the destination port is on a whitelist, continue allowing the connection and ...
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2answers
95 views

How to setup a netem box

I'm trying to simulate different network condition based on factors such as latency, bandwidth and so on. I found that Netem is the best way to simulate different network condition. So my desired ...
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7 views

Two network cards, one directly to internet, other in LAN [migrated]

I need some insight in my thinking so that I don't do something completely stupid. I have two physical network cards on my computer, one card/interface offers a handful of services and the other is ...
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10 views

TL-WR1043ND v.1 (1.8) WAN to LAN port [migrated]

TL-WR1043ND v.1 (1.8),Firmware: DD-WRT v24-sp2 (08/07/10) std with fried WAN port, I need to reassign the WAN port to one of the LAN ports, and also to change the new WAN port ( let's say LAN port 4 ) ...
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34 views

Install Intel 10 Gigabit AT2 Server Adapter Server 2012

I'm attempting to install an Intel 10 Gigabit Ethernet AT2 Server Adapter into a machine, running Server 2012 R2. Hardware Information: PCI\VEN_8086&DEV_150B&SUBSYS_A12C8086&REV_01 ...
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27 views

Disable source IP checking for Azure VM

For an Azure virtual machine, is there a way of disabling source IP checking on a virtual network, in the same way as EC2's "Change source/dest address check" allows you to do on a VPC subnet? ...
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22 views

CentOS: How to create a default route after server starts

I'm using CentOS 6.7 on Proxmox KVM. Now I would like to get my network-connection working. This is my config: Now I have to perform ip route add 89.xxx.xxx.1 dev eth0 and ip route add ...
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24 views

I can not attach additional network interface to an existing amazon EC2 instance

I need three network interfaces in one instance for my work.By default there is one eth0 but I want to add eth1 and eth2 in an instance. I created network interfaces using the same security rule that ...
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1answer
22 views

Servers, cloud and network

I need so help so I have few questions. I work in small company and we are going to be buying one or two servers for our needs. We are in area that isn't well equip with internet (only ADSL or WiMAX) ...
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1answer
32 views

UDP Server behind Gcloud load balancer: receive ok, reply fails

I have a UDP server set up (on a VM) behind the Google Cloud network load balancer. The server is bound to 0.0.0.0. The UDP server can receive messages that were sent to the balancer, but replies do ...
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32 views

iptables change source and destination ports

I would like to receive traffic on multiple UDP ports and also my application (which is listening on a single port) to know from which port the request came from. If the source port becomes the ...
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11 views

Capture no-modified packet with iptables

I have a user-space program in which I process packets. I send them there with help of iptables. The problem is that I capture not original packet but modified. I have wlan0 interface up with access ...
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adding an enabled network controller to linux

According to the lspci, there are three ethernet controllers and indeed there are three network sockets on the motherboard. All of them are enabled in BIOS and their LEDs blink. 02:00.0 Ethernet ...
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1answer
26 views

windows server 2012 r2 change node type

I'd like to force a station to be Node Type p-mode instead of hybrid. In regedit: cptr\HLMCurrentControlSet\Services\NetBT\Parameters I don't find the node mode. The goal is to remove UDP port 138 ...
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23 views

lower tcp throughput than expected

I've conducted some tests which measured tcp throughput via wireless and wired connection. (a) was wired link between my desktop and my home router. (b) was wireless link between my desktop and my ...
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1answer
23 views

Azure Virtual network (classic)

I am trying to use a IIS reverse proxy running on IIS in a new Azure VM against an old classic VM. I have the server proxying onto the classic VM but this is currently over the public IP address. Is ...
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60 views

PFSense IPSec and NAT

Due to bad design and hosting provider constraints I have a network where I don't control the router. Our network: 172.16.0.0/12 - LAN x.x.x.0/24 - WAN (Router is connected to the switches, we have ...
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31 views

work folders access denied

I set up work folders in my organization and that was fine until last week. now I have some issue. One of my clients' works fine but mine and the others' can't access to work folders. I have admin ...
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24 views

Understanding arp request tcpdump

I noticed the below tcp dump when pinging a docker container B on bridge B from a docker container A on bridge A. Container A: 10.0.0.3 / 02:42:0a:00:00:03 Container B: 10.0.0.4 / ...
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iptv set-top box cant route to the internet

I am trying to setup an iptv server. This server should run DHCP service, web server, and also a router. the linux box has 2 Physical NIC. Eth0 : (DHCP Service) : 192.168.98.100/32 ...
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2answers
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Network share as USB connected device

I have a situation where I am having to work around a medical vendor who has for security reasons limited the connectivity to a system. The only connection I have available to the system is USB and ...
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What are the Resilient Overlay Network (RON) downsides?

What are the RON downsides? How this type of network handle with security questions? There are vulnerabilities? The RON's performance is good? Thanks in advance!
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How to diagnose/troubleshoot tftp timeout

I have 2 VMs. One is setup as a pxe server (dhcpd with a specific subnet and a tftpserver). The second VM is networked with 'vboxnet2' to first VM and it is able to get the DHCP IP as specified my ...
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43 views

Group Policies Not Applied At Startup with SSD PC

I have a problem with some new computers containing solid state drives which will not apply group policies at startup. All other PC's apply the GPO's no problem. Manually running gpupdate /force ...
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forcing proxy traffic to route via a specific 3G dongle interface

I've searched for details on how to do this but I've been unsuccessful - I wondered if someone could offer up some advice. I have 2 network cards (LAN and 3G in my case), LAN is my main interface ...