Managing and using network connectivity on a unix system

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1answer
44 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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12 views

Is there a way I can auto-connect to a network with a certain SSID using Connman?

I want to create a script that will auto-connect to a network if it has a certain SSID. I am not sure if that is possible with Connman. Can I tell Connman to connect with X credentials if it finds a ...
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1answer
25 views

Run concurrent static and DHCP network connections in CentOS 7

I've been trying to set up a VM for study purposes that can share some iSCSI resources on a private network with the IP 10.0.2.10/8. However, I also want to be able to concurrently use the same VM to ...
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0answers
62 views

How to tether Ubuntu guest to iPhone on Windows host using Virtualbox?

Here's my idea: at work, I am behind a firewall and can't access most of the web. I'm on Windows 7. I installed virtualbox with an Ubuntu 14.04 guest. I want the guest to use my iPhone personal ...
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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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1answer
32 views

Mutt hangs sometimes when connection is limited to imap.gmail.com

I wanted to restrict email clients to connect to only 1 IMAP server - imap.gmail.com. And wrote this iptables rule: iptables -A OUTPUT -d imap.gmail.com -p tcp --dport imaps -j ACCEPT I have an ...
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20 views

Where are macvtap settings on rhel 7

I am creating a virtual machine in KVM on Red Hat Enterprise Linux 7. I have created two bridges and connected two interfaces which are on the physical hardware to the bridges. How can I use these ...
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1answer
49 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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1answer
32 views

How can I check whether a given connection is going through my VPN?

I use openVPN to connect to a server at work. However, I only want to use the VPN for work-related stuff and not for my regular browsing. I don't really know much about VPNs, so it's entirely possible ...
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2answers
65 views

Linux static routing : Ping a private network(Network Diagram Attached)

In the Network Diagram above my aim is to ping 192.168.20.20 from System A. I do not want to configure the router. For that to happen All the traffic to 192.168.20.0/24 should be first forwarded ...
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1answer
31 views

/etc/network/interfaces file valdiation

Are there any tools baked in to linux that I can use to validate the syntax in /etc/network/interfaces or /etc/network/interfaces/*.conf files akin to the way I can validate sudo using visudo before ...
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1answer
14 views

Does SIGHUP get triggered upon broken telnet/SSH connection?

I'm trying to write a mail program which might contain data that a user wouldn't want to lose upon a broken SSH/telnet connection. Would SIGHUP be sent to the process? After all, it's the "hangup" ...
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2answers
34 views

Bridged interfaces do not have internet access

I'm trying to run a QEMU VM but it doesn't have an internet access, only access to the host and a Docker network. What I did: Created a bridge with: brctl addbr virbr0; Turned it on: ip link set up ...
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0answers
36 views

A script or series of commands that turns off wlan0 when eth0 is not connected, and turns on wlan0 when eth0 is connected again?

I'm bridging a connection from a device that only has eth0 to a wlan0 device to use it as an access point to the Internet. I've been able to create the bridge itself without any issues. But there's ...
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0answers
16 views

Create a bridged interface like VirtualBox

When I createa a VirtualBox VM with Bridged Network (manually specifying which interface to bridge into) my VM gets IP address from the DHCP server in my LAN. How is this interface created? I want to ...
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2answers
44 views

Why ssh is not authenticating the password [closed]

I'm trying ssh to another machine with option k or K. It is not verifying the password. With any string in password section, it is logging in. what is the reason behind this? Example: ssh -k ...
3
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1answer
45 views

How can Wireshark see packets dropped by iptables?

I recently installed my hard drive in a new computer and after some fiddling around I noticed my iptables rules were dropping DNS responses for some reason, turns out they were configured to allow ...
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0answers
46 views

problem in mirroring interfaces' traffic using OVS

I'm trying to mirror all incoming/outgoing traffic of an interface "eth0" on VM04, to another interface "eth1" on VM01, using open Vswtich integrated with neutron in openstack. Both VMs are in one ...
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1answer
37 views

Netstat do not show my ip

On my local network, my nas (synology 5.2) has this ip: 192.168.1.13. My ip adress on internet is like 90.30.*.*. But when I use netstat on my nas for information about my current connections I've ...
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0answers
23 views

QT application doesn't receive udp broadcast since linux kernel 3.13.0-70

I'm developing a QT application on Ubuntu and suddenly had problems because QT app doesn't receive UDP broadcast messages. They are visible in Wireshark on that machine, but never received in QT. ...
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1answer
16 views

Connect Docker container and host to different network

I don't know if this makes any sense, but is it possible to use WiFi in host but only mobile broadband in a docker image?
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33 views

TFTP error when downloading larger files

Embedded Linux device, with BusyBox v1.4.2 multi-call binary. I tried download files from remote device to local computer via TFTP, but got some issue: it works OK for small files (about ~350MB), but ...
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1answer
68 views

Cannot ping VirtualBox VM using bridged network

I have a Fedora 22 laptop with a VirtualBox VM on it. All worked fine when I attached the VM to my wireless network card, but I want to attach it to my hardwired card because the wireless changes. But ...
1
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1answer
86 views

FreeBSD: adding ip alias to interface breaks network on primary ip

I am trying to add an alias to my network card (I would like to use jails) on my FreeBSD box. It is running version 10.2-RELEASE-p7 (generic amd64 kernel). The machine is running in a Hyper-V virtual ...
0
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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 ...
0
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1answer
186 views

Help With PulledPork Please

I have been working to get snort, barnyard2 and pulledpork installed on my Ubuntu machine, and I have the 1st two installed not problem. With pulledpork I cant seem to get past this error message: ...
0
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1answer
29 views

SSH tunnel between 3 box to get internet access

The network looks like this : Server X -- My machine -- Server Y My machine has SSH access to both boxes. Server Y has internet but not server X. How can I make a tunnel so server X can acces the ...
2
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2answers
36 views

Reference manuals for network configuration on Fedora/CentOS/RHEL?

Every time I need to configure a network interface on Fedora/CentOS/RHEL I need to access its online documentation to check which configs and values I should use in the ...
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0answers
61 views

Implement network bridge as userspace program?

I am looking to do some packet filtering/address rewriting for packets which are coming from and going to a lxc container. After some basic research, I figured the best way to do this is to assign a ...
3
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3answers
50 views

Redirect subfolder to another local IP in apache [closed]

I've got a raspberry pi working and being accessible through a domain, which is asada.net. It serves web pages using apache 2.2.22. Besides, I recently bought a NAS which has a web page in a local ...
0
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1answer
16 views

Value of nmap option

I've found in some docs of port knocking, that it is used the option --host-timeout I don't understand why is 201 assigned to it? e.g.: nmap -Pn --host-timeout 201 --max-retries 0 -p 7000 ...
0
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1answer
45 views

Embedded Linux and Init problem - Init won't start

I'm working on a embedded system. I have multiple SD cards to save copy of Linux rootfs on (kernel saved in nand). On a original SD card, where is located a system, and from this card the system is ...
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0answers
19 views

How to add ovs interface back to init namespace from custom one?

Am creating an internal interface tap1 in ovs & add it to a custom namespace ns1. ip netns add ns1 ovs-vsctl --may-exist add-port br0 tap1 ip link set tap1 netns ns1 after am done using the ...
1
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2answers
52 views

Automatic and secure file transfer over two servers

the problem is how to automatically transfer backups from server A to server B in the best possible way in terms of security? Here is what comes to my mind: authorize server A pub key to access ...
3
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1answer
48 views

How to limit port range in Ubuntu 14.04?

I want to limit source port range in my ubuntu machine upto 20000 , that means no Application should be able to use port higher than that.I have this command in mind iptables -A OUTPUT -p tcp ...
2
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0answers
47 views

Difficulties with connecting to WLAN with wpa_supplicant on a system rescue CD

My box epicly failed and I am trying to get online to begin the rescue. The very same config which used to work on my dead system doesn't work now and I cannot connect to WLAN using the same ...
0
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1answer
47 views

How do I access a static IP based Unix server from my home internet? [closed]

I have a UNIX static IP based server running RHEL 5.11 and want to access it via Putty/Command Line and via WinSCP over the internet from my home computer. As my home internet doesn't has a static IP ...
1
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1answer
27 views

MAC id eth0 and wlan0 for flexlm servers

I am trying to set up a flexlm server. The vendor asked me to send the MAC ID of my system. I typed ifconfig. And found that there are 2 different HWaddress for eth0 and wlan0. Which one is the MAC id ...
1
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1answer
15 views

WiFi troubles when power adapter is connected

I'm having troubles with my WiFi router and my laptop at home. Communication between the two is crappy. So I made some test and also I tried different wifi channels and I discovered a weird thing: If ...
1
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1answer
46 views

Why is my IP resolved to 127.0.0.1 instead of the IP I have in the network?

I have a problem understanding how IP resolving works on Linux systems. To demonstrate my problem I'll show an example on Windows and afterwards on Linux. Windows: The Windows hosts file is empty. ...
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0answers
60 views

Quagga ebgp routes not advertised to ibgp peers

I am trying to achieve http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#conf3. Only difference from the setting is that the ISP is sending full BGP table instead ...
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0answers
43 views

How to Turn Off Network Discovery Linux Mint

When I go to Network in my File Explorer, I see the Windows Network AND my computer's hostname. How do I turn off Network Discovery in Linux Mint 17.2? Is there any option like there is in Windows?
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90 views

Systemd networking: IPv6 networking not available at boot

I've a Debian machine running multiple static IPv4 and IPv6 addresses managed by systemd itself at /etc/systemd/network/10-static-eth0.network as follows: [Match] Name=eth0 [Network] ...
2
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3answers
78 views

How to list all linux processes that had any network activity during some period of time (past or future)?

I'd like to know which processes use the network: To inspect if any unknown to me (and potentially malicious) programs on my system use the network; To learn the amount of network traffic by the ...
2
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1answer
26 views

tunnel netcat video streams to mplayer

I am sending a video stream over my network and I want to encrypt it with ssh. This solution below works: on machine 1 I run ./capture | nc 192.168.1.65 5001 on machine 2 I run netcat -l -p 5001 ...
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1answer
38 views

Cannot change inet address to anything eth0

For some reason, I cannot change the inet address of eth0 to anything else than 10.0.0.9. When I do so through the command: sudo ifconfig eth0 inet 10.0.0.X, pages, pings, etc. load for 30 seconds and ...
0
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1answer
45 views

Ngrep strange behaviour

I have a very odd problem. I'm using Fedora (with KDE), and I need ngrep for checking the data sent which is transfered through a specific port... The strange part is that when my terminal (more ...
5
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1answer
57 views

Intermittent Network Connections - CentOS

I having a very strange issue in one of my servers which seem to lose connections every few minutes: it runs on a CentOS 6.5 64 bit arch and it frequently experiences network disconnections. I have ...
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0answers
64 views

wifi support for Realtek [10ec:8821] on VivoPC VM62N-G050R

I've got a VivoPC VM62N-G050R, http://www.bhphotovideo.com/c/product/1131163-REG/asus_vivopc_vm62n_g050r_mini_desktop.html (link provided just for info, neither recommending nor dis-recommending this ...
1
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2answers
94 views

Establish a PPP connection on boot

Trying to automate making a ppp connection on boot. I have a cell modem (skywire LE910 SVG) that I have working manually using pon. My ppp/peers/isp is configured and the corresponding chatscript is ...