Managing and using network connectivity on a unix system

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Allow all traffic using iptables within a linux router

I've followed the official Ubuntu tutorial for setting up a router here . The problem is that within this router some traffic seems to get dropped or something. I have a network-namespace that no one ...
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1answer
27 views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
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19 views

Blocking or forwarding packets as access point

I set up my Pi 2 as a wifi access point following this tutorial. I'd like to implement a rudimentary QoS, according to the DSCP field in every packet's header. That means, blocking packets using low ...
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3answers
54 views

Which program is altering my resolv.conf?

On Debian 8 stable, I add dns server IPs in /etc/resolv.conf but after some time they get overwritten. I don't have gnome installed (I use i3wm) and network-manager is not installed either. On ...
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2answers
14 views

Get the IP for NetBios name [duplicate]

There is a mashine called "BIE" visible in my network surrounding of my dolphin File manager (Ubuntu 14.10). I cannot access that device in dolphin and also don't get an answer pinging it. How can I ...
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6 views

Debian Network 2 subnets one interface proxmox

I have a box that runs proxmox with a debian 7 base. It is virtualizing openvz venet VMs. The host node and all VMs are currently inside of the same /24 . I recently got a new subnet and wanted to be ...
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0answers
16 views

Fedora 21 wired internet problem

Booted up Fedora on my desktop (previously was running w8.1, with also some network problems on restart/wake but usually a reset of the adapter solved them.) No internet on the Fedora. Here are the ...
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36 views

How can I redirect all UDP traffic from one port to another on BSD / OS X?

On Mac OS X 10.9.5 I am running boot2docker and would like to temporarily forward a non-privileged UDP port 69 to port 69 of the boot2docker virtual machine. Virtualbox only supports forwarding ...
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1answer
34 views

Static IP changes to dynamic automatically after time

I have found only one discussion about my problem here, but not a solution. I have access to one Debian 7.8.0 amd64 virtual machine (under VMware) and its IP address is gained through DHCP, e.g., ...
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0answers
10 views

WPA_Supplicant bgscan doesn't populate scan_results

I'm using WPA_Supplicant 2.1 with Wext driver, on a custom Linux 2.6.27 kernel. The issue is that bgscan fails to populate 'scan_results' other than the network that wpa_supplicant is currently ...
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25 views

Virtual Box Bridged network failed to get IP (DHCP) No DHCPOFFERS received

My goal is to get Bridged network working. When I try to UP interface in my Virtual Box VM, it tries some DHCPDISCOVER messages, but eventually I get No DHCPOFFERS received. I found where is the ...
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1answer
33 views

Ping to LAN address takes an incredibly long time?

I'm running CentOS 7 in a lab environment with one domain controller (DC - Windows 2012R2) which serves as a DNS and DHCP server as well. CentOS is joined to the domain; it can ping the DC and a ...
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0answers
18 views

openbsd: mpls provider doesn't forward packets

Can anybody help me with next question: I am trying to get mpls test network up like in http://lteo.net/blog/2013/09/03/a-small-mpls-test-network-built-with-openbsd/ or ...
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0answers
14 views

Problems Setting Up DHCP Server On CentOS 6

I have been trying to set up a DHCP server on CentOS 6 running on an Intel NUC i7. I have installed dhcpd and am using the example dhcpd.conf subnet 192.168.1.0 netmask 255.255.255.0 { option ...
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0answers
16 views

Debian won't accept my network's password during installation

I'm trying to install Debian Jessie on a Toshiba Satellite M45-S331, but I'm stuck on the "Configure the network" step. I successfully installed the firmware for my wireless card, and I am able to ...
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0answers
11 views

Problematic RTL8188EE Wireless Network Adapter

Good Day All, There are numerous results when searching google on this issue, however, none seem to have a solution. I am hoping to resolve this issue -- or at least have a decent workaround. It is a ...
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0answers
8 views

Radiusd(freeradius): User only for a special client

Is it possible to restrict a user from the "users" file to a special client? I try to use one radiusd server for two wifi access points but I will use one user credentials only for one access point ...
3
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1answer
37 views

What exactly is an ifconfig dropped RX packet?

I'm seeing very high RX dropped packets in the output of ifconfig: Thousands of packets per second, an order of magnitude more than regular RX packets. wlan0 Link encap:Ethernet HWaddr ...
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0answers
12 views

docker container manual networking setup not working

I have an application environment where two containers need to talk to each other. container A gets a message from container B, and container A initiates a connection back to container B using the ...
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0answers
21 views

Make OpenVPN restart upon new network connection on systemd

How would you go about making OpenVPN automatically restart upon connecting to a network? The issue is that every time a network connection is lost, or if the computer is booted without a network ...
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1answer
28 views

Routing table and multiply hops

I have 6 networks, I need to connect network 1 and network 5 via five routers. What’s the command to set multiply hops? ip route add IP_address/mask via IP_adrress dev eth0, but how do I set next hop? ...
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1answer
34 views

Monitoring ARP Poisoning

How to monitor ARP poisoning? These few days my internal website that can be accessed locally has weird image replacing every images on the site for few seconds (it got back to normal after ...
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1answer
26 views

Office 365 online from Unix working only with MTU <= 1400

First of all --- I really didn't know where to post this question: askubuntu, unix, superuser... I am posting this one here because the only cases I have seen are on Ubuntu and I have a report for ...
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1answer
54 views

systemd waiting too long for network at Debian 8.0 Jessie's boot

My system has booted up relatively fast while run Debian 7 Wheezy, but after upgrade to Debian 8 Jessie, and therefore SysVinit to systemd, it became a way, way slower. The thing, slowing down the ...
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1answer
40 views

Change Network Bandwidth

I am using ethtool to change the bandwidth to 10MB/s. Since this is my first time using this program, I am struggling with the correct syntax to change it. I have tried something like: ethtool -s ...
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1answer
53 views

Connectivity issues after updating to Debian Jessie

I have inadvertently upgraded to Debian Jessie from Debian Wheezy while I was trying to install VLC player :D. The upgrade did not go very well as my sources.list file was mix of wheezy and ...
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1answer
26 views

How to block the response of certain DHCP server

There are multiple DHCP servers that run on our LAN, and some of them are unwanted. Can I configure my OS to reject certain responses so that I can get the correct one?
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1answer
25 views

Is it possible to have 2 different passwords saved for the same network?

I'm not always at home and sometimes the router needs to be reset completely to receive a new wan ip address because my roommates are not very tech savvy at all. When this happens the password is ...
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1answer
45 views

Prevent a lot of brute force attacks on Exim2

Some people or computers have been trying to log in a lot of times on my Linux DirectAdmin server over the last few days. I am receiving a lot of messages of brute force attacks for Exim2 in ...
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1answer
32 views

Where is routing table stored internally in the Linux kernel?

When I execute route -n, from where exactly (from which structs) is the information displayed retrieved? I tried executing strace route -n but I didn't help me finding the right place it's stored.
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1answer
22 views

Cannot mount Samba share: Unable to find suitable address

I just moved house, and after putting up all my devices, on my RasPi, running Raspbian, I cannot mount my TimeCapsule's SMB file shares anymore. It used to simply work, but Now I get this: ...
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0answers
32 views

CentOS 6 Include Gateway for Static IP Address

I've just set up a static IP Address for my CentOS Machine using the following settings in /etc/sysconfig/network-scripts/ifcfg-eth0 #eth0 Config #IPv4 DEVICE="eth0" NM_CONTROLLED="yes" ...
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2answers
36 views

Looking for Vodafone's mobile broadband application for Debian 8 (Jessie); does it still exist?

I have a Vodafone K3760 3G dongle I've used on laptops since Squeeze & Wheezy generally using (in preference to Gnome Network Manager's own support for mobile broadband) an application Vodafone ...
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0answers
42 views

Interfaces, IPTables, Connections, Local Connection - Confused :/

I configured my iptables today and ran into some questions i could not resolve yet. So it would be nice, if someone could verify or answer the following to clarify: Each interface can be configured ...
2
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1answer
50 views

How can I share my internet connection (wireless) with an ethernet only computer?

I have a raspberry pi B+ set up in a server configuration and it connects to internet succesfully over Wifi with a USB dongle. My other pi (an A+) has always been located downstairs in the garage, ...
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1answer
68 views

cannot ping my computer on local network

I am running on 64 bit OpenSuSe 13.2 with Gnome 3 desktop environment and unsuccessfully trying to set up Samba Server. I have another computer running windows 8.1 from which I am pinging the ip ...
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0answers
18 views

dhclient allows for address conflicts

I invoke from my application dhclient but there is a problem with IP addresses conflicts. If I have other interface with statically set IP address, dhclient does not send DHCPDECLINE when DHCP Server ...
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4answers
84 views

Linux as a network printer device (Raw, port 9100)

Is possible to configure a Linux computer to work as a "network printer device" ? I have an USB printer that I intend to share in the network like a native network printer device. Is that possible? ...
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0answers
32 views

What are possible reasons why iwconfig is not updating connection stats?

I use iwconfig to show me some information about my current internet connection like this $ iwconfig wlp2s0 IEEE 802.11abg ESSID:"eduroam" Mode:Managed Frequency:2.462 GHz Access ...
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1answer
35 views

How to send AT commands to modem once the connection is established?

I have a zte 3g modem. I use carrier provided dialer for connection establishment. Once the ppp connection is active, i would like to send some AT commands(for ex. Query signal strength, AT+CSQ). But ...
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1answer
20 views

Route a port through a network interface

I'm using OpenVPN on Ubuntu Server to connect to my VPN. That network interface is tun0. All traffic currently goes through the VPN. I'd like to exclude traffic that goes over a specific port, and ...
2
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1answer
42 views

Where does network waiting go in 'top'?

If top is showing high loads, and you don't know if the process causing it is doing processor time or is doing network i/o (not local i/o) how can you find that out? On our server I see high values ...
2
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3answers
109 views

Understanding WiFi routing and gateway

I'm completely lost. I'm a real beginnqer about Linux networking. What I’m trying to accomplish : As bobstro said, I want to allow a wifi-connected UPnP camera to be moved around between wifi ...
7
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3answers
304 views

How many bytes occupy a simple nmap to a host?

Today the IT manager got angry because I used nmap on the 3 servers I manage to see what ports they had open. I know I could have used netstat inside the host' shell. He told me that "If the network ...
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1answer
23 views

virtualbox on os x lags when not active

I am running ubuntu server as guest inside virtualbox on os x 10.10.x host While the system works, it lags whenever the virtualbox window is not the active app. E.g. I log into ubuntu from terminal ...
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2answers
45 views

Routing Configuration sending some traffic over VPN

I have a DD-WRT router with an OpenVPN service configured. I'd like to send only certain source IP's over the vpn connection. I believe my current routing table (as seen with netstat -rn) sends all ...
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1answer
52 views

Portable way to kill a process listening on a given port

Is there a way to kill a process listening on a given port (e.g. in bash lsof -t -i tcp:8000 | xargs kill) from a shell script that will also work on cygwin, as well as bash?
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1answer
38 views

Crossover Cable 2 Linux

I have a crossover cable. I want to move files and folders between my two Ubuntu's. I have partially set this up. They can ping each other. But when I use putty the connection gets refused with no ...
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1answer
37 views

Splitting port/IP-bound traffic between interfaces

Similar to this request (I think) I'd like to see traffic bound for a certain port number routed through one specific interface while traffic for a specific IP is routed through another. The server ...
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2answers
70 views

How to connect from home PC to Virtualbox/KVM that hosted on Ubuntu server?

I have an Ubuntu server, it's 3TB HDD space total and 24GB RAM, I want to take 1 little bit of space and RAM to make VPS Windows using VirtualBox or KVM. I want to install Windows Server 2008 on ...