Managing and using network connectivity on a unix system

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Why INetSim cannot bind to port 80 and port 25 [duplicate]

I am running INetSim on a Debian 8 32-bit VM. INetSim needs to be executed under root, and I do so. I know that only root can bind to ports lower than 1024, so it should not be a problem of privileges ...
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1answer
1k views

What do I need to add a virtual IPsec adapter?

I'm trying to set up an IPsec connection manually from the console with iproute2. What I need is a virtual interface (at best, a virtual IP address could also be sufficient) that IPsec-transforms ...
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2answers
49 views

How to give all computers connected to a network switch internet?

I want to make a cluster computer out of Raspberry Pis (with a network switch/hub, and mpiexec), and have run into the issue about how they will get internet access. Since it would be a hassle for all ...
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2answers
16 views

Linux network authentication issue

I know this is a lot more on the networking side than it is Linux, but I'm only having this issue on my computer. Everything else connects just fine. What's going on is I have a router in one room ...
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2answers
66 views

BeagleBone Black static IP address was changed strangely

I set up my BBB to static IP address like below: root@beaglebone:/var/log# cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate ...
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1answer
31 views

How to fix that dhclient uses massive amounts of bandwidth when bridging eth0 to wlan0?

I have been using my Raspberry Pi as a WiFi adapter for my PS3, because the internal WiFi adapter on the PS3 isn't good, but the USB adapter on the Raspberry Pi is much better. I have been using these ...
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how does one force the network service to use an updated interface file on system start

I've got an application that we deploy via ovf template. I have it set up so that a customer can enter the network settings into vSphere and they come through via ovfTools. All that works just fine. ...
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1answer
505 views

Two network interfaces (eth0 and eth1) of same linux machine can't ping each other

I have one Linux machine having two gigabit network interface. I want to run the traffic test such as iperf on two interfaces: eth0 will be server and eth1 will be client. I connected back-to-back ...
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2answers
34 views

Why can't devices connected to my wlan0 interface communicate with eth0 devices?

I'm trying to set up a Raspberry Pi running Raspbian Jessie with the following configuration: DHCP Server (isc-dhcp-server) WLAN Access Point (hostapd) Application Server (HTTP server on port 80) ...
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1answer
24 views

Network configuration problem with 2 network cards

I have a Debian "jessie" machine configured to work with two different Wi-Fi USB dongles. The first one (wlan0) creates an ad-hoc wireless network using hostapd, while the second one (wlan1) should ...
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1answer
29 views

1:1 NAT through VM VPN

I've got a few client servers that I connect to with different VPN clients (e.g. Cisco, OpenVPN, etc). I'm trying to set up an Ubuntu 14 VM (with VPN client permanently connected) for each server to ...
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1answer
48 views

Unable to resolve hostname for Redhat Linux server

I've setup a Linux RedHat server and would like to use it by referring to its hostname instead of the static IP. eg. ssh admin@myhostname.blah.di.blah, instead of ssh admin@XX.XXX.XX.XXX but I get a ...
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2answers
5k views

why can't this CentOS 7 server see wifi connections?

I recently installed CentOS 7 as the sole OS on an Acer Aspire T. There is no GUI, as it is a server with a terminal-only interface. What do I need to do to get CentOS 7 to be able to see and list ...
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11 views

ipv6 connectivity problems

I've got persistent ipv6 problems with my laptop running kubuntu 15.10 : download speed is very slow, and some transfer just end up totally stalled or timed out (ipv4 runs perfectly fine). It's not a ...
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1answer
41 views

Using ether-wake reports error “sendto: Network is down”

The command sudo ether-wake xx:xx:xx:xx:xx:xx prints sendto: Network is down for all MAC addresses I plug in. I couldn't find any information on how to fix this - I'm clearly connected to WLAN on ...
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1answer
29 views

Linux routing IPv6 packets through incorrect interface

I have a Arch Linux system where link-local packets are not being routed properly. I have 4 interfaces on this machine (wan, lan0, lan1 and lan2). All three of the lanX interfaces are bridged ...
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24 views

Set Primary NIC - Fault Tolerance and Redundancy - Raspbian Wheezy

English is not my native language so please be patient. Hi to all, happy new year. I have a Raspberry Pi 2 (model B) running Wheezy (4.1.7-v7+), after a lot of help from Diederik and the community, ...
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1answer
29 views

How to have netcat server close after n seconds

I need to use nc in a weird way, where I want the server to first send a file, and then recieve a file, and this repeats. I would like to have every instance of the server server close after some ...
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21 views

How does authentication work on stunnel on unix?

I am aware of how PGP cryptography works ( using private and public keys - and therefore always keeping private keys private ) but what I therefore dont understand is: why stunnel setups require a ...
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1answer
80 views

Wget and curl can work normally, but ping fails

When I ping www.google.com and 8.8.8.8, I get no reply: # ping www.google.com PING www.google.com (216.58.221.228) 56(84) bytes of data. ( no response) # ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) ...
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Pipe Text Into and Out of Netcat Server Using mkfifo

I wanted to make two pipes for a netcat server that inputs text into the server, and one that outputs text from the server. I have the server running in a seperate script with the input and output ...
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1answer
39 views

What logs or diagnostic steps can I take to check for Debian Jessie network failing to start?

The network of a Debian Jessie VirtualBox VM I created recently fails to start at runtime. The only way I can get it the network to run properly is by adding service networking restart to ...
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2answers
2k views

Using bash's `/dev/udp`, how would I know if the port was open?

I do not have access to netcat or nmap so I'm trying to use bash and the /dev/udp/ special files to test ports. I could do something like: echo "" > /dev/udp/example.com/8000 But $? is always 0 ...
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Debian: WiFi Adapter WNDA3100V2 stopped working

I have a Debian 8.1 PC running a Web server and all of sudden it stopped accepting my WNDA3100V2 USB drive. I was not able to log remotely via ssh anymore. At home, the power was still on and the ...
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4answers
17k views

What can I use to monitor and log incoming/outgoing traffic to/from remote hosts?

I run a web server (Debian Squeeze on a VPS), and the graphs provided by the hosting company show consistently that around twice as much traffic is incoming to the server compared to the outgoing ...
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2answers
4k views

Blocking Websites with /etc/hosts

There's a website, www.example.com, that I tried to block myself from accessing because it wastes too much of my time. So I configured my /etc/hosts file. I added the following lines, to block the ...
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1answer
43 views

Cannot access website externally, while being able to access it internally

The situation is as follows. An Apache-based site is accessible internally (from within its server) via curl, but not accessible externally (nothing, with an exception of ping, works: I have tried ...
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1answer
64 views

how to setup network without wicd or NetworkManager

I am working on a raspberry pi box with ubuntu(15.10) installed. It has limited memory so I want to same as much as possible. In memory usage report wicd/NetworkManager and subprocesses usage aprox ...
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2answers
3k views

lts is there a way to enable sleep mode and wake on lan?

I was wondering if it were posible to make my server go to sleep after a set period of time, but still be listening for lan requests. I use my server as a media server that might get used 3 or 4 hours ...
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1answer
2k views

Raspbian, Huawei E303, Public IP address

After configuring Raspbian linux and a Huawei E303 3G USB stick, I am stuck accessing the machine from the Internet by its public IP address. Details: The E303 stick was configured to work as an ...
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2k views

What are the interface prefix meanings in ifconfig?

I'm not sure if these have a name, but on most computers I use the interface prefixes are usually: eth- : Ethernet/Wired wlan- : Wireless/WiFi However, on my ASUS RT-N56U, I have the following: ...
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1answer
2k views

Ubuntu: wire network is not stable and must restart network-manager periodcally

I don't know why my wire network now is not stable. After a short time of using, maybe 30 minutes, 15 minutes or maybe just 2 minutes, my network is down. When my network is down, I must run this ...
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14 views

Need to identify process pid for NetHogs to google servers

I have the following output from NetHogs. I'm trying to find out which pid's are associated with it or what these processes are doing with google servers. I do have chromium installed but not running. ...
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1answer
62 views

dhcpcd and /etc/network/interfaces

I have this configuration in /etc/network/interfaces: auto lo iface lo inet loopback allow-hotplug wlan0 iface wlan0 inet manual wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf allow-hotplug ...
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1answer
3k views

Accounting for /proc/net/dev reported traffic

I noticed that according to /proc/net/dev I am constantly receiving around 6Kb/s on my wireless usb interface. But I can't account for anything even close to that with the individual connections that ...
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39 views

pfsense: Network freezes when squid service started in bridge mode

We are using pfsense firewall in bridge mode. When squid service with Transparent proxy option is started the network freezes. On routing mode, squid works pretty well. Squid setup is as below: ...
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2answers
36 views

Unable to connect remotely to custom application

I've built an application that listens on the localhost address and a specific port, lets say port 11001. Its on a remote machine with CentOS. I currently have a python script on my local machine that ...
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1answer
39 views

How to connect to virtual network on linux

I start most of my virtual machines using virtual box. Most of the time I configure them with bridge networking. But this time I would like to set it up with nat network. I added a virtual network ...
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1answer
817 views

Internet connection being lost after about 10 seconds

Okay so I have looked at this post Network connection drops after a few seconds, Which looks similar to the problem I am having but I have only just got Linux and can't work out what to do. Before I ...
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1answer
47 views

Dropping a connection upon event

Is it possible to drop a number of connections when establishing new ones? For example, suppose we have a set of remote workstations with addresses {A, B, C} and another set with hosts {D, E}. We ...
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1answer
703 views

Compile network card driver on debian

I buy a new network card , D-Link DGE-528T. My OS is Debian(Jessie) kernel : 3.16.0-4-amd64 but it can't detect the new network card, so I must to compile driver by myself. follow README file. ...
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1answer
370 views

Kali 2.0 DSL connection

I have freshly installed Kali 2.0 but I don't know to how to get access to the Internet by using my Username and Password. Can anyone tell me how to configure manually Ethernet(eth0) or rather ...
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1answer
3k views

Debian, two network cards - “no route to host” on eth1

I have added a secound nic in a debian box. That nic is ment for doing some test stuff, so those devices connected should just be able to access the debian box or be accessed from it. To set up the ...
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0answers
23 views

Manually configure Link-Local IPV6 regardless of ISP

The long and short of it is we have a system with a single ethernet port and we need to provide both an IPV4 connection (that can be completely incontrol of the user and varies per system) and we want ...
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Ubuntu machine hang and whole LAN network stopped responding

I am getting problems when my Ubuntu machine, it hangs(keyboard,mouse stopped responding, and screen looking blur). Also, the whole lan/wan network stopped responding. Please advise? ...
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2answers
41 views

No network capabilities in CentOS

I've just download and installed the latest version of CentOS inside a VirtualBox VM. Installation went OK, but when I start the VM and log in, if I try and ping anything I get an error due to lack of ...
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4answers
58 views

Access directory on Linux machine from a Windows 7 machine over WAN

I want to access a directory ON a computer with Linux Ubuntu 14.04 installed as OS, FROM a computer with Windows 7 installed as OS, IN Windows Explorer. In case both computers have Linux Ubuntu ...
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1answer
64 views

Virtualbox - how to give Internet access and internal network access to two VMs?

I made two Virtualbox virtual machines, CentOS 7 latest iso. I gave them each 2 network interfaces, one NAT and one "Internal network" in order to get them to talk to each other and have Internet ...
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1answer
43 views

Help testing special file in `/sys/class/net/`

Background I am managing a cellular interface. I have a bash script that is testing the interface. In question is the file located at /sys/class/net/wwan1/carrier where wwan1 is an unconfigured ...
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353 views

Bridge interface - add default route

I used to connect my ubuntu 14.04 laptop on office network via eth0 and the route table gets updated with the office network gateway ip in auto mode. Now, i changed my /etc/network/interfaces ...