Managing and using network connectivity on a unix system

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Why does a connection from my LAN to my public IP address fails?

I have an OpenVPN server on server. It is available from Internet via a two NATs: first the ISP box relays to 192.168.0.10, then 192.168.0.10 relays to 10.10.10.254 (relays = DNAT). I can connect ...
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2answers
19 views

Messed up my mac firewall configuration (pf.conf) and ended up with 100% packet loss

I was trying to do wifi throttling for my new app development (new to this) and was trying to do it using iceFloor application. I'm not 100% sure if this is a problem, but i need to confirm if i ...
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1answer
62 views

Home automation program “cannot assign requested address”, but only when run via VNC on a Raspberry Pi

I am trying to connect to a program through VNC, which scans the LAN for a "Cube" (MAX eQ-3) which connects to my radiator valves. The program gives the error "[99] Cannot assign requested address, ...
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13 views

KDE's network applet not listing APs, while iwlist does after some extra steps

KDE's network applet doesn't list any wireless network. It used to, but I must have made an unintended change. This much I know about my situation (the device is called wlp4s0): Upon login, the ...
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0answers
21 views

What does it mean 10.171.10.1 --> 10.171.10.2 in openvpn-created interface?

I have installed OpenVPN server in FreeBSD and it created interface, visible by ifconfig: ovpns4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500 options=80000<...
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68 views

How can I create a two-way voice communication system that works over the local network?

I wish to create a simple two-way voice communication system between two Linux computers running Debian-based distros (probably two Raspberry Pi Zeroes). Each computer will have a microphone and ...
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13 views

Ubuntu: Wifi access point clients constanlty reconnect to AP

I did on my Ubuntu 14 LTS PC WiFi access point using this how-to https://www.quora.com/How-do-I-create-hotspots-in-Ubuntu-14-04 . So from clients I can use internet but the connection is very slow. ...
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1answer
53 views

Connect to a wireless network as standard user without administrator authentication Linux Mint 17.3

I'm trying to get a standard user on my laptop installed with Linux Mint 17.3 on the wireless. I can get to the internet just fine logged in with an administrator but as soon as i log in with a ...
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1answer
69 views

How to route IPv4 traffic from an interface to another

I connected my Pi to my home computer through an Ethernet link. My computer is connected to the Internet by a wireless connection. And I'd like to route all Internet traffic from my Pi by my computer. ...
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25 views

Unable to configure ethernet interface using dhcpcd

I've got an embedded Linux system based on buildroot. I'm trying to get the unit connected to the internet using the ethernet interface, but without success. Here's what I'm trying: After booting up ...
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1answer
42 views

Kali linux network error

I'm new here and I'm from Tunisia so my English is my 3rd language so forgive me for my bad grammar mistakes. OK, I have Kali 2.0 linux (32bit) installed in windows 8.1 (32bit) (dual boot, no VM), ...
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2answers
60 views

Ubuntu: I cannot reach internet

I'm trying to install nodejs on my Ubuntu server but it seems not to be able to reach the internet. My server has two network interfaces: eth0 connected to my network eth1 used sometimes to be ...
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0answers
84 views

TCP SYN,ACK Retransmissions

The following network trace was recorded on a Raspberry PI running Debian Linux. It seems the Raspberry is not seeing the data packet #36995 for some reason; it is just stupidly repeating his SYN,ACK ...
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16 views

OpenVPN maintain connection state during tunnel reconnect

Sometimes I want to do a short maintenance like restarting a tunnel, all connection running on top such as file transfer...etc will receive connection lost signal, is it possible to maintain those ...
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1answer
35 views

How to “nc -z <address>” with socat?

I want to get the behavior of "nc -z host port ; echo $?" with socat, since my network admins have disabled netcat. The purpose is just to test that a TCP connection is open between two servers. How ...
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0answers
135 views

Create a script that connect to wifi, and if it fails fallback to ad-hoc network

I'd like to create a script that tries to connect me to the wifi specified by my wpa_supplicant conf, and if it fails, create a ad-hoc network. But I'm struggling with it. Here is what I do for now: ...
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25 views

'ip netns exec' command execution using nsid obtained from 'ip netns list-id'

I have previously used ip netns exec command to modify netns interfaces. But if there is no name associated with a netns (eg: docker), how can I use nsid result of ip netns list-id command for ...
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1answer
108 views

How can I set device mode via networkd

How can I set mode to device (for example monitor/ap to wlan) via networkd deamon in .link file ??? Because I want to set bridge in .network of wlan device and I can't do it until I set it in ...
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1answer
26 views

How Would I Appropriated Add this Route?

I've got an ASUS RT-AC66u running an OpenVPN server working fine. But on my debian server I have to add a route or else I get no responses. Just curious if there is a way to add the route to the ...
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0answers
30 views

Ethernet intermittently fails to come up

I'm working with an embedded Debian system and I'm having trouble getting ethernet working consistently. Once every 5 or 10 times that eth0 is brought up something fails and I can't connect to it via ...
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2answers
58 views

Measure network consumption per program and month

I'm looking for a permanently-running monitor which can emit a monthly (or daily, etc) bandwidth report, in a per-program manner. Example desired output: Bandwidth consumption: last 30 days ==========...
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72 views

Alfa Network Atheros AR9271 not works under Debian

I'm trying to use the Alfa network Atheros AR9271 but not works, when I execute the following command lsusb I got: Bus 001 Device 035: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n I ...
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56 views

Problem configuring static IP on centos 7, 6…,

I have 4 static IP addresses, I already used 143.4.198.0 and 143.4.198.1 (for Ubuntu server and it works pretty fine) I wanted to install Centos 6 or 7 I made the same conf like before I have a VM ...
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38 views

I cannnot connect to guest os(protostar) through ssh from host-pc (linux mint)

I'm trying to connect a to guest machine (protostar) through ssh from my host PC (Linux Mint). I'm using VirtualBox. I tried: setting up hostonlyadapters. setting up NAT Networking. ...
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1answer
33 views

Initializing fully connected ssh network

I have five Linux machines with a service account on each under the same name. They all have a subnet connection to each other (192.168.1.{1,2,3,4,5}). I have a script that parses /etc/hosts and adds ...
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0answers
62 views

qemu-system-arm problems adding second NIC/bridge

I am running Qemu under a host with two bridge interfaces and would simply like to bridge them to guest NICs. All of this works fine when bridging one NIC either by creating a bridge manually or using ...
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0answers
31 views

How to visualize bridge and port connections in Linux?

I have complex setup of Linux bridges, OVS bridges, veths pairs etc in a Debian host. Is there a tool that will produce a image of which is connected to what and which port's traffic is egressed ...
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1answer
57 views

Packets not moving through linux ethernet bridge

I am trying to set up a debian 8.3 machine with eth0 and eth1 bridged, but I can't get packets to traverse the bridge. Currently, eth0 is connected to a LAN with many other hosts, including a DHCP ...
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0answers
25 views

Message: network connection could not be established - but network is working

Upon system start and directly after logon to the system into the GNOME 3 evironment there is a message pops up (next to the clock), that says that the network connection could not be established. The ...
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0answers
17 views

Why does `ping -M do -s 8000` still work between hosts with different MTU values?

I have two hosts: alice (192.168.0.1, mtu 9000) bob (192.168.0.2, mtu 1500) They are directly connected with a cat 6 cable, with no switch in between. Why is it that I can still ping bob from ...
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0answers
15 views

ipv6 rule priority duplication

When I add ipv4 policy rules using ip rule add the resultant rules get added to the end of the policy table with decrementing priority from 32767 eg: # ip rule add lookup 8 # ip rule add lookup 9 0:...
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25 views

Boot Kali Linux into forensic mode; hangs loading network interfaces

When I boot my Kali Live CD (2016.1) in forensic mode, it gets to the point of auto-log in for root, and then immediately tries to start loading the network interfaces eth0 and wlan0. When neither ...
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0answers
40 views

How do I run a systemd oneshot service whenever my system gets a new IPv6 address?

I would like to run a systemd oneshot service whenever my system gets a new IPv6 address assigned to it from the network router (this would be on boot, and periodically throughout its uptime). ...
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33 views

Centos static route

I have a load generator running on a Centos client and I need to alter the routing table on that client to send all traffic destined to a particular server(192.168.7.215) through a WAN emulator(192....
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32 views

ip link up with empty line

case: # eth0.cfg The primary network interface auto eth0 iface eth0 inet static address IP-1 netmask 255.255.255.255 broadcast IP-1 post-up ip addr add 192.168.100.254/24 dev ...
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1answer
88 views

My Network Adaptor is present, but using the command 'lshw' shows that the 'device is not claimed'. How to claim this driver/device?

I recently installed Linux Mint on my Dell Inspiron 3551 and everything works fine, except the WiFi network adaptor. I do not have an Ethernet port in my laptop and have to heavily rely on WiFi (I ...
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2answers
75 views

SSH always connects to the same IP address [closed]

No matter what the host is, SSH keeps trying to connect to 162.13.177.241. Command ssh -v user@host Output debug1: Connecting to 162.13.177.241 [162.13.177.241] port 22. My /etc/hosts file is ...
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0answers
59 views

Is there a utility that allows to create structured data from tcpdump hexdumps?

Sometimes I have to use tcpdump to troubleshoot problems with networking protocols that tcpdump does not know how to parse. Is there a utility that could read tcpdump packets in hex dump format and ...
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0answers
18 views

What are the consequences of adding a network interface to a bridge?

Context: I have a headless computer/server with 2 network interfaces (e.g. eth0, eth1) running CentOS 7. eth0 faces the world/Internet. A laptop is connected to eth1, and accessing the internet ...
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1answer
38 views

linux + how to monitor dropping from ifconfig or ip

How to monitor RX dropped packets in Linux 7 with tcpdump ? Or maybe any other way? And what is RX dropped? ifconfig results on eth1: # ifconfig -a | grep RX | grep dropped RX errors 0 ...
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1answer
71 views

Setting static ip address for multiple ethernet controller

I have a simple question for which I couldn't find a answer for hours on the internet. I didn't think it's so much special what I want to do, but it seems to be. I have Debian virtual machine within ...
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0answers
57 views

Trying to run OpenVPN in Network Namespace

I want certain apps to access the internet via OpenVPN. I found a solution in the final answer/comment at the bottom of this question/thread here: Feed all traffic through OpenVPN for a specific ...
0
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1answer
52 views

sendmsg: Network is unreachable

I set the IP address of my network card to a particular value to be able to talk to a piece of hardware. Then I try to ping it, which works for a few seconds, until I get the error ping: sendmsg: ...
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1answer
53 views

How can I grant permission to a user to change the IP address?

I need the user be able to change the IP address, without giving him full super user access. How can I do that? I tried the solution here http://serverfault.com/a/480823 That works fine, but only ...
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0answers
43 views

Unable to connect to wifi “IPv6: ADDRCONF(NETDEV_UP”

When I click on the wifi icon and the hotspot I want to connect to, nothing happens. Nothing at all. And here's my dmesg: [ 9647.582070] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready [ 9957....
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29 views

Different IP addresses, same interface

I have a Raspberry Pi and I have configured the wifi interface with static IP - 192.168.0.110. It worked fine, on every restart it got this IP. But this beautiful morning I restarted the Pi and ...
0
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1answer
45 views

Linux Mint LAN Connecting But Not Working

I am new to Linux and working on Linux Mint 17.2 on my laptop. I am able to connect using LAN wire (i.e. on the right bottom it shows connected) but not able to access the internet. It works great on ...
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33 views

How to determine the logical type of a linux network device

with logical I mean everything legal in the command ip link as in, for instance: ip link add link dum0 name dum0.200 type vlan protocol 802.1Q id 200 where the logical type would be "vlan". All ...
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102 views

OpenVas + Kali Rolling: The connection was reset

I am trying to get OpenVAS to work in the latest Kali release (rolling). It seems to be installed right, but when I try to access the web interface (127.0.0.1:9392), I get Connection was reset. ...
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52 views

Kali on VirtualBox w/ Bridged Network Stuck on Connecting

I've just installed Kali on VirtualBox w/ Windows 10 as the host. Everything else is fine except for one problem. I tried to bridge a connection from my host system's WiFi adapter to the VM but the ...