Managing and using network connectivity on a unix system

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How to tune dhcp networks configuration?

I'm not sure how should I configure my guest VirtualBox networks. So far, I figured out how to override this configuration so that I can connect to machines on both networks. But I'm manually ...
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0answers
20 views

How to put user dns on the first place in network manager?

After changing dns in network connections, dig and other programs still query the provider's name servers.
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1answer
15 views

How do I detect which device was recently created by pppd?

I'm trying to setup a VPN over SSH using PPPD (following the Arch Wiki). The command given is: /usr/sbin/pppd updetach noauth silent nodeflate pty \ "/usr/bin/ssh root@remote-gw /usr/sbin/pppd ...
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2answers
22 views

Add virtual bridge without the loss of networking?

There is a dedicated server without KVM-over-IP support. The server 'owns' two IP addresses, and one of those is used for eth0 at the moment. The user needs to add a virtual bridge, in order to ...
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1answer
9 views

How to capture traffic from a website using tcpdump

I need to capture traffic to https://gmail.com using tcpdump. I solved this by using tcpdump -n dst host <ipaddress of gmail> But is there any way I can directly specify gmail.com instead of the ...
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1answer
25 views

Connecting to a WPA2 network

For connecting to networks use WPA/WPA2 with PSK, from here wpa_passphrase your_network_name your_password > wpa.conf ifconfig wlan0 down ifconfig wlan0 up iwconfig wlan0 essid ...
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1answer
23 views

Network UNCLAIMED - Unable to access internet

My Kubuntu was working well until I think a day ago, and suddenly I don't have access to Wi-Fi. I've tried turning on the connection via the Connection editor but the box was grayed out. After looking ...
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1answer
14 views

dd wrt firmwire file prompt password while extracting

I am a newbie in using dd wrt firmware development. Last day i download a dd wrt firmware dd-wrt.v24-21676_NEWD-2_K2.6_mini-e900.bin for Linksys E 900 router. I need to extract this image for ...
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2answers
50 views

What exactly happens in Linux internally when an ethernet cable is connected?

I would like to understand what exactly happens when a cable is being connected to the Ethernet port (assuming dynamic IP addressing): What services are being run and how are they triggered? What ...
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1answer
19 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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12 views

interface associates with access point, but dhclient hangs

I'm having an issue connecting to my access point from the terminal. I'm using iw to connect: iw wlan0 connect MY_AP Running iwconfig wlan0 shows that it's associated with the access point. But ...
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0answers
43 views

Disable networking only inside of a single terminal

I want to run a command in the terminal to disable networking, just in that terminal. How can that be accomplished? I'm running OSX. Note: I only want to disable the networking in that terminal. ...
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23 views

Wiereless Not Working in Macbook Pro Retina (2014) [on hold]

I am a new Linux user. I have had a problem with the detection of my wireless network adapter in Kali Linux for a while. I have posted in their forums but with no success, but as I have seen that this ...
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1answer
27 views

How to make virtual interface ping to a host in the network

I crated a virtual interface as indicated in this link. sudo modprobe dummy sudo ip link set name eth10 dev dummy0 sudo ifconfig eth10 up sudo ifconfig eth10 192.168.1.150 now if I want to make a ...
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1answer
42 views

Enable Promiscous mode in CentOS 7

How to enable promiscuous mode on network adapter. I have tried by adding PROMISC=yes in /etc/sysconfig/network-scripts/ifcfg-ensxxx but no effect even after network restart or rebooting the system.
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13 views

Aix equivalent of tcp_retries2 linux parameter [on hold]

Please help me with the Aix equivalent of tcp_retries2 paremater that is available in linux machines.
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1answer
33 views

How can I monitor network connections for an app

I'm running a chat application on my machine called foo - how do I view all connection attempts (failed or successful) for foo? I have attempted this with netstat, but I am unsure how to associate ...
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1answer
38 views

Will this work? [on hold]

I have a relative who doesn't have a Ethernet jack to her laptop and was wondering if a USB 2.0 Male to 10/100Mbps RJ45 LAN Ethernet Network Plug Adapter Cable will work. She has a old netbook 1.6Ghz ...
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1answer
28 views

USB Wi-Fi correctly installed but it can't access the Internet, Debian Wheezy

I have a USB Wi-Fi stick correctly installed on my Debian Wheezy system. from dmesg: ADDRCONF (NETDEV_CHANGE): wlan0: link becomes ready from ip a: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> ...
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1answer
39 views

How do I disable network interfaces from loading at boot without Network Manager?

The machine I'm using has 4 network interfaces, only one of which is currently being used (the other 3 are not plugged in at all). Currently when the machine is restarted it is delayed by a few ...
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0answers
21 views

Need help with a network manager command line script

I am looking for some help in creating a script. As RHEL boots up and I login, I'd want to manually run a script which would: Identify the active ethernet interface (the eth ID being used). Ask ...
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0answers
33 views

Is it possible to set interface name permanently in Raspbian?

I'm using 2 wifi dongles. First one is used to monitor and second one is used to access internet. Even if I changed /etc/udev/rules.d/70-persistent-net.rules as below, at startup sometimes wlan0 ...
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13 views

Congestion Control algorithm performance testing in FreeBSD

I am working on implementation of a proposed modification of TCP Congestion Control algorithm that would allow to improve it (the CC) by adding a dynamic bandwidth estimation. I have been able (with ...
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0answers
11 views

Linux Container LXC Intra Host Networking Issues

I have a problem that I cannot seem to resolve. I have two hosts M and N. A container in host M can ping the gateway, its host and all containers in Host N but cannot ping any co-hosted container in ...
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4answers
1k views

Simplest way to send files over network

What is the simplest and most versatile way to send files over the network to other computers? By that I mean computers that other people are using at the moment. I don't think SSH works if the ...
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0answers
16 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 ...
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16 views

How to add routes multiple times in routing table?

Need to add same route multiple times in the routing table, or is there a way to maintain references in the routing table entries ? (may be with different priorities etc.) Am working on a switch ...
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1answer
39 views

What is blocking: Firewall and tcpwrapper?

Is it possible to find whether firewall(Iptable) or tcpwrapper is blocking a connection without accessing the remote server? (tcpdump?) Thank you,
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26 views

Command to see my current ip if proxy is applied only for a certain website

It might not be a relevent question here on so, but I tried on http://networkengineering.stackexchange.com and there are less users. So, I am not a networking guy and I have the next situation: I ...
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3answers
37 views

is there a system-wide “extension” to /etc/services that does not get replaced on package updates?

I know how to use /etc/services but if I change it and the inetd package is later updated via apt-get to a new default one, my changes are gone (happened to me on a apt-get dist-upgrade from Debian ...
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0answers
17 views

Which flags should I use for my “netstat” commands?

I would like to use two variants of the netstat command; one exclusively for IPv4 and the other exclusively for IPv6 traffic. In both cases I would only like to list the following information: ...
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0answers
19 views

Program like vnStat that filters for only external (Internet) traffic

I've been using vnStat to monitor the ethernet interface on a Linux computer, but found that it includes all local traffic. I do many file transfers from within the subnet which far exceeds the ...
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1answer
26 views

Samba and usbmount: can't write on automounted device

This is my problem: I configured my RPi with Debian: Samba shares /media/, that is readable-writeable-executable from my home network usbmount automount USB devices when inserted in my RPi, in ...
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1answer
22 views

how to overcome conflict between 2 network cards - virtualbox ubuntu

I am running ubuntu 10.4.04 LTS as guest in virtualbox on OSX Yosemite. Unfortunatelly I seem to have the network configured wrong I followed this tutorials ...
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39 views

Set the TCP window scaling option to 4 & the TCP window size to 65535 [closed]

I want all TCP packet (linux system) to be sent with: TCP window scaling option set to: 4 TCP window size set to: 65535 (0xffff). How I can configure my linux system to do that?
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1answer
37 views

Bonding two interfaces

I'm trying to simulate bonding between two interfaces eth0 and eth1. So basicly, I need these two interfaces to be on the same subnet. My question here is: How can I achieve this?
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1answer
35 views

Addresses overlaps

I was putting somes static addresses to my interfaces then it shows me this: 172.16.1.0 overlaps with FastEthernet 0/0 What does it mean when two addresses overlaps and how can we avoid it? EDIT: ...
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2answers
109 views

Elementary OS shows WiFi networks, but won't connect

In the top bar, clicking the network icon shows a list of networks. My school's network, which on Windows I would connect to, and then visit a login page in Chrome in order for it to work, shows on ...
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0answers
30 views

Linux - iptables - get YouTube streaming bytes usage

How do I get bytes usage using iptables for a particular IP, including YouTube streaming videos? Currently, I am using the following IP tables rules to get data usage by IP address: sudo iptables -I ...
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1answer
41 views

I can't ping my bond interface when simulating 2 WAN connections

I'm actually simulating 2 WANs connexions with Wanem (each one on a different VM), those are connected to my servers. What I need to do here is to create a bonding to improve my bandwidth. I've ...
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2answers
22 views

Unable to connect to certain IP address, but able to connect to other IP in same subnet

I'm running a 14.04.2 LTS ubuntu box in a DMZ with IP of 10.10.30.35 and I have the following network mystery. I'm trying to connect to another unix box outside the DMZ but in our internal network at ...
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1answer
14 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
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1answer
25 views

Sharing the loopback interface across network namespaces

I'm interested in using a separate namespace for running a VPN client, so that every process I run into that namespace accesses the Internet through the VPN. That part I've managed to accomplish. ...
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1answer
32 views

Unable to access another server over local network on Digital Ocean

I have two servers. Let's call them A and B. Both are running ubuntu server 14.04. B runs percona server. Now I do not have any firewall set-up on either servers still I am unable to connect to server ...
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0answers
11 views

IPvsadm, cannot get it to work at all

From my production server, I should make several connections (>50) to two different IP addresses. I am trying to load balance among these two IP addresses when making outbound connections so that the ...
0
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1answer
26 views

How to force nm-tool to update its DNS servers

Using Ubuntu 14.04LTS and having a problem with changing DNS. I can change servers in the /etc/resoolvconf/resolv.conf.d/base and head files and restart resolvconf using sudo resolvconf -u and it will ...
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0answers
26 views

URXVT network issues

So yeah. Whenever I maximize URXVT my friend's computer's League of Legends client, while in-game, latency goes up to around 3,000. Wireshark, ntop and tcpdump do not reveal any outgoing packets ...
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0answers
20 views

Get Debian Wheezy netinstall to detect wlan

I'm attempting to install debian wheezy from the netinstall iso burned to usb. I'm trying to use a Belkin F9L1002v1. First time I attempted installation, I was notified of some missing firmware, so I ...
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0answers
32 views

Running a systemd service file after the network is up to bypass an OpenVPN default gateway

I would like to add a static route using a systemd service file on system boot. I have a DMZ network on a separate 192.168 class C network reachable via my default gateway. I also use OpenVPN to ...
0
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1answer
36 views

What does “network interface” mean in /etc/network/interfaces, ifconfig and iwconfig?

/etc/network/interfaces is a file configuring network interfaces, and ifconfig and iwconfig are commands operating on network interfaces. I saw the logical name for a network interface they use can ...