Managing and using network connectivity on a unix system

learn more… | top users | synonyms (1)

2
votes
1answer
28 views

ping works but curl does not [closed]

I am trying to set up networking on my development server running Arch Linux, but something is amiss. I have enabled dhcpcd on all interfaces, and ping now works (including dns resolution), but ...
1
vote
1answer
36 views

Unable to set mac address to tap interface using systemd-networkd

I'm trying to migrate some tap interfaces setup from tunctl to systemd-networkd. I'm using systemd version 215-8. So I have this test.netdev file: [Match] [NetDev] Name=tap_test Kind=tap ...
0
votes
0answers
13 views

nbtscan shows error “Failed to bind: Address already in use”

I am trying to use nbtscan to get a list of PCs in my local network with their NetBIOS names. When using nbtscan with the option "-r", it shows this error: Failed to bind: Address already in use ...
0
votes
0answers
38 views

Automating PPP connection: adding the insertion in routing table of the new interface

I start my USB 3G Modem by: # wvdial And then I must do, in order to acquire internet access: # route add default ppp0 Note that ppp0 is, in this case, the newly created virtual network ...
3
votes
0answers
39 views

tc cbq doesn't work (no traffic limitation)

I've been trying to use cbq weight attributes after HTB failed to do so. I've tried using a command set I've found in an example just to verify it works (HTB works fluently) Here are the commands I ...
2
votes
0answers
43 views

What does `NO-CARRIER` and `DOWN` mean for a wireless interface?

I have a remote server and I log output of certain commands while the server cannot access the internet. It uses a wireless interface to connect to the internet. In a working state the output of ...
2
votes
0answers
37 views

Correctly populating wpa_supplicant.conf from iwlist scan results

I am wondering how I can tell that my wpa_supplicant.conf file is both sufficient and valid. When running iwlist scan outputs ESSID:"wifi" Protocol:IEEE 802.11bgn Mode:Master Frequency:2.412 GHz ...
2
votes
1answer
25 views

How to record network throughput per port for long period of time

I have come across vnstat recently, and am enjoying it's simplicity, low resource usage, and its ability to record network history long term. However, I am looking for a similar tool (for long term ...
0
votes
0answers
31 views

default route of br0 gets dev eth0 instead of dev br0

On my LinuxMint laptop, i have a recurring problem with my bridge br0. On each start up, the default route does not work. The routing table uses eth0 instead of br0 probably because of dhcp. i roam ...
1
vote
1answer
44 views

No Default Gateway route for bond0 / Slave eth* interface gets IP assigned

I have set up a 4-NIC bond on my Debian Wheezy box. After a fresh boot, the system has LAN access, but cannot resolve outside host names or access outside IPs. It seems that this is because the bond0 ...
1
vote
0answers
25 views

Interface doesn't come up in docker run

I'm starting a docker container with my own network configuration: [root@localhost ~]# docker run --net=none --lxc-conf="lxc.network.type=veth" --lxc-conf="lxc.network.ipv4=10.0.0.100/24" ...
0
votes
1answer
21 views

set network manager dns in ubuntu

I have Ubuntu 14.10. When I'm at work I can browse the internet without problems. Now that I'm at home, I can connect, but I'm not able to browse the web. Some informations: the output of ifconfig: ...
1
vote
0answers
18 views

What does the “first Ethernet card” mean in the BSD world?

https://www.freebsd.org/doc/handbook/network-routing.html The designation link#1 refers to the first Ethernet card in the machine. Question: what does the "first Ethernet card" mean? How to ...
-2
votes
2answers
83 views

No longer able to reach the Internet on Kali Linux

I'm running Kali Linux on VirtualBox and trying to learn some of its basics. I know it's based on Debian but I come from Windows so I'm new to Linux and networking in general. My problem is that ...
0
votes
1answer
24 views

two NICs in the same subnet— need to set up routing

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ ...
2
votes
4answers
203 views

Read the current IP address from the filesystem? [closed]

I'm writing a program that needs to know the system's current IPv4 address (received via DHCP), if it's connected and has one. For the sake of argument, the language is irrelevant and I must read from ...
0
votes
0answers
12 views

run netperf without IP address available

I have DPDK set up, with two NICs taken over by DPDK, i.e. the interfaces are not visible to userspace applications. Now, I need to run netperf/iperf to measure throughput performance of port-to-port ...
0
votes
0answers
15 views

netperf: run with no control connection

Trying to run netperf without setting up a control connection between netperf and netserver: client% netperf -N -H 10.0.0.2 ... netperf: send_omni: connect_data_socket failed: No route to ...
0
votes
1answer
41 views

Why can I connect to the IP of a network interface (on a server with multiple network interfaces) when the network cable is removed?

I have a Server with multiple (four) network interfaces running Arch Linux when I encountered something strange that I cannot explain. I have two interfaces configured to the the ip addresses ...
2
votes
4answers
95 views

Two IPs on one NIC ( network card )

I have a dedicated server with one network card in it. I however got two IP adresses. When I use the simple command sudo ip addr add 188.40.90.88 dev eth0 it fails to see it as a seperate IP. I've ...
0
votes
0answers
16 views

What Linux app will show me how much internet bandwidth each process is using? [duplicate]

Linuxmint 13 Cinnamon 32 bit with ver. 16 backports ethernet (eth0) + pppoe (ppp0) + FTTH (fiber optic to the home) no wifi What program(s) can I use to tell me how much up/down internet traffic ...
1
vote
1answer
15 views

Connect to offline network on second interface

I would think there's likely a dupe of this around but I cannot find it. I have an offline router I'm using to connect a remote wireless device. The router cannot be configured as an access point, ...
1
vote
1answer
36 views

How is /proc/net files getting populated in Linux/Unix?

I'm working on a network monitor for Linux, without packet sniffing. I'm planning to read the network statistics and related data from /proc/net files. I know that /proc is the mount point of process ...
1
vote
1answer
37 views

generate traffic at wire speed

I have x86 based machine with Intel Core2 CPU 6300 1.86GHz and 2G of memory. I'm looking for options to generate traffic on the machine at line rate, or as close as possible. OS is Fedora 20 with ...
0
votes
0answers
43 views

"Error: no device found for connection 'static'. while creating network connection with nmcli

I am using Red Hat Enterprise 7 for on Vmware. I am getting error which creating network connection with nmcli Here is my all steps [root@localhost Desktop]# nmcli con show NAME UUID ...
0
votes
1answer
62 views

Linux tun interface packet routing [closed]

I have questions on the ip packet flow for the following scenario. The scenario is : A tun0 (10.0.0.2/8) interface and a physical wireless lan card wlan0 (ip address not fix) on the client side, ...
2
votes
0answers
63 views

Is Traffic control inside namespace on ports created by OpenvSwitch supported?

I am trying to limit the bandwidth of an interface inside a namespace using tc without much success. Seems it's not supported according to ...
0
votes
3answers
52 views

Setting IP address of choice for a Virtual Box

I've a service running on Amazon AWS which has restriction on inbound connections to my office machine IP address which are like 10.x.x.x When I'm at home, I connect to VPN and my IP address when I ...
0
votes
0answers
28 views

Kali internet error— High RX packets and TX packet error Ping working

I'm a new Linux user who just switched to Kali Linux. However, it appears that I am unable to browse the internet with iceweasel though ping works fine. Further inspection with ifconfig and iwconfig ...
1
vote
0answers
63 views

Resolve IP address from MAC address

I am working in a network with subnet mask 255.255.0.0 (i.e 65534 hosts). The network has IP assignment scheme with DHCP server. In case of system restart or lease time completion, the system's IP is ...
0
votes
0answers
30 views

how to solve networking starting problem?

I am using Ubuntu OS. I need to find my IP address to configure the interfaces in /etc/network/interfaces. Yet my networking service cannot restart. I get this error message: $ service networking ...
1
vote
0answers
18 views

Adding a Wildcard to PowerDNS

Ok, first, full disclosure: I'm a total noob at this and could be going about it all wrong. I'm trying to use a server on my network (in this test case a Raspberry Pi running Raspbian) as the DNS ...
1
vote
0answers
77 views

ping localhost sometimes fails with sendmsg: Operation not permitted

I have a problem with network adapter (i think) , look I trying to ping my self and got a error sometimes, how this can be ? First time in my life i see this. # ping 127.0.0.1 PING 127.0.0.1 ...
1
vote
0answers
13 views

Wireless server only allows a single client

I have a BeagleBone Black running Debian configured as an access point using hostapd and udhcpd. A node based HTTP server accepts request on port 80. The device is not connected to any wired network. ...
3
votes
0answers
59 views

Linux - On boot do push-button-connect to strongest wireless

I'm trying to configure linux (in this case CentOS) to automatically connect to the nearest WiFi via "push-button-connect". This micro computer has no keyboard or display, so the goal is to hit the ...
2
votes
1answer
59 views

empty 70-persistent-net.rules on SuSe 13.1 and ethernet device called eno1

openSuse 13.1 configured my network controller as eno1 during installation. Also eno1 device can not be configured by KDE Network Connection tool, it doesn't allow you to add a connection for this ...
2
votes
0answers
38 views

Connecting to two ISP in local network using two different network

We have two ISP 1. BSNL (INDIA), 2. Airtel (INDIA). we getting Bsnl internet through D-Link DSL 2750U modem which holds the IP 192.168.1.1, Airtel internet modem with 192.168.2.1 IP address, Here it's ...
1
vote
1answer
71 views

Sane can't see Samsung CLX-3305W network scanner in Ubuntu 14.04LTS

I've installed a new Samsung CLX-3305W multifunction printer/scanner a couple of weeks ago on a dual boot system with W7 on one physical drive and Ubuntu 14.04 64-bit on a separate drive. The printer ...
2
votes
1answer
42 views

How do I apply iptables SNAT to packets bound for localhost (INPUT chain)?

I'm setting up a host that has two routes to the public internet: one via my run-of-the-mill home gateway router, the other via a gateway router on a semi-private network (AMPRNet on 44.0.0.0/8). Most ...
0
votes
1answer
50 views

How to install ALX drivers for an AR8171 network adaptor in OMV

I bought a shiny new ASRock FM2A88X Extreme4+ motherboard (which I chose specifically for the plentiful expansion slots) to run my shiny new file server. During the installation of Open Media Vault, ...
1
vote
2answers
28 views

nginx web server on VM inaccessible to host

My laptop is running Ubuntu 14.10 desktop and hosting 14.10 server in a libvirt VM (set up using virt-manager). I installed it in minimal virtual server mode with only openssh-server. After ...
2
votes
1answer
46 views

Wireless network bridge

I am trying to create a network bridge to allow virtual machines to use my wireless card to connect to my home network. My plan was to do something like: iw dev wlp12s0 set 4addr on brctl addbr ...
4
votes
2answers
85 views

IPv6 connections timeout

I'm having issues with IPv6 connections. Only with those. They timeout roughly every 10 minutes (due to address renewal i suppose). Happens with every debian based flavour of linux i tried in a year ...
1
vote
3answers
72 views

Status of network ports

I hope it is possible to get the necessary details of each network port from /etc/services. If I have to develop a C++ program to get the status of each port how should I start it? I am not allowed ...
0
votes
0answers
28 views

Networking works only when using Iceweasel in Kali inside of VMWare

As the title says, I have a problem with my connection in vmware. I'm using vmware 10.0.1 andthe latest version of kali. It's a little weird that my connection will only work on iceweasel browser but ...
2
votes
3answers
179 views

Modem is not being detected (Why I've to usb_modeswitch?)

I am using Trisquel 7.0 LTS and mobile broadband (Net-Setter) to establish connection. Following states (1-4) are showing different conditions/situations for clear understanding of problem. ...
0
votes
0answers
37 views

Unable to connect the Ubuntu EC2 instance to VPC LAN on AWS using secondary NIC adapter?

Infrastructure setup: VPC is created with 192.168.254.0/24 netwok Private subnet within VPC (Virtual Private Cloud) is created with 192.168.254.0/25 network Public subnet within the VPC is created ...
0
votes
0answers
49 views

Establish reverse ssh tunnel at OS startup / network connection up

I'm trying to setup a reverse SSH tunnel using a middle-man, due to firewall restrictions. I took the following steps: from ssh server do reverse tunnel: ssh -R 8080:localhost:22 ...
-1
votes
1answer
36 views

Make TCP to reconnect automatically and quickly

In my Debian Linux system apt-get dist-upgrade is sometimes stalled with [Waiting for headers] message. To make it pass faster I press Ctrl+C and start the command again. How to tune the system to ...
2
votes
0answers
30 views

Same Wifi names keep messing with connection

I just got a RasPi and I'm looking to replace the Windows PC that's doing the routing job. (To save electricity) What I'm trying to do with it is make it connect to a wifi network using it's bssid(or ...