Managing and using network connectivity on a unix system

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Connecting to wifi network from Fedora 22 Server

I've installed fedora 22 server from a DVD and in the setup I could connect to wifi network and apparently did so. However, on reboot, the server is not connected to the wifi network. I've also tried ...
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1answer
40 views

How to change the host file after login

Was wondering whether in a Nix environment I can change the content of the host file, mainly to prevent one or two site being accessed from that particular user, and only for his account (not with ...
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25 views

monitor network status for systemd script

I am writing service script under systemd which logs bandwidth usage every 1 hour. If network goes down, something should tell this script that network is down and the script will stop temporarily. ...
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1answer
22 views

X Window Over network

What makes X Window or X11 protocol use a lot of bandwidth when used over a network (LTSP, etc.)? I've tried to read some docs but I can't find the answer
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1answer
48 views

What is the output meaning of ss -p

When I use the -p or --processes option, I get the output like this: LISTEN 0 511 ... ... users:(("nginx",4209,255),("nginx",18819,255)) I know ("nginx",4209,255) means the nginx process ...
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4answers
495 views

how am i able to telnet to http port 80

After searching in google I found out that we can telnet to web-server to its http port and use GET to retrieve a html page. For ex: $ telnet web-server-name 80 But I am not able to understand ...
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35 views

linux to linux IP MASQUERADING failed (can't ping ip server)

I'm new in linux, i'm trying to IP MASQ. So the diagram is like linux A is connected to HUB and Internet, and linux B is connected only to HUB. In linux A i have eth1 (10.10.10.5) and eth0 ...
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39 views

Is there a way to resolve DNS locally when using an HTTP proxy?

This is based on this question: http://askubuntu.com/questions/447877/how-to-resolve-the-dns-locally-when-there-is-a-proxy-configured All I want to know is if there is an existing way to achieve ...
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1answer
49 views

dhcpcd failed to start

I installed Archlinux before 2 or 3 days. The weird internet connection was working fine until today, the dhcpcd fail to start. When I type systemctl status dhcpcd@eno1.service it says timed out, ...
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2answers
19 views

try download a file from server if the pathname is known

I access a webpage by this url http://someRandomName.no.meaning:20025/hello.html The location of the hello.html that is displayed is /var/some/fulder/hello.html. (I mean in the server it is ...
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1answer
43 views

iptables DNAT+SNAT: unwanted multiplication of the same udp datagram (and malfunction)

trying to figure out my mistake in the following very simple scenario: |peerA|(Aip:Aport) <--> (Bdev:Bip:Bport)|NatNode|(Cdev:Cip:Cport) <--> (Dip:Dport)| peerD (peer A emits datagrams ...
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37 views

PostgreSQL ssh connection from outside network

I have a PostgreSQL Server (CentOS 7) running on the network, it is set up to allow remote connections which works from inside the network. Any computer on the network can connect to it using ssh -L ...
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39 views

How best to enable end-user configuration of wifi or Ethernet on embedded device?

I'm building a device that includes an embedded Linux computer and I need to allow the device user to (easily) configure the device to connect to their wired or wireless network. I know there are ...
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35 views

How to disable IPv6 ping response in Linux without firewall

How can I disable IPv6 ping responses in Linux without using the IPv6 firewall? This question covers how to do this using the IPv6 firewall via iptables, but I'm using an embedded system that doesn't ...
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21 views

Static networking via shared internet [duplicate]

So I have a old Pentium 3 PC with Debian LXDE(but I would just prefer to SSH into it's terminal) and an HP probook 4530s laptop with Ubuntu 15.04. My laptop is connected via wifi to my home router. ...
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2answers
66 views

Is USB 3.0-to-USB 3.0 data transfer between two Linux OSes possible?

This Is USB-to-USB data transfer between two Linux OSes possible? question and the answer is USB 2.0 which is simply outdated. As USB 3.0 is much faster than simple Gigabit Ethernet and I want to ...
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1answer
47 views

How do you add a virtual network IP address from the kernel command-line?

I would like to add a virtual IP address, something you normal do with: ifconfig eth0:0 192.168.1.1 (or via /etc/network/interfaces). But, I'd like to do it from the kernel command-line, which has ...
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9 views

How to Benchmark Forward Proxy

I want to have a forward proxy with content processing, so I modified http://www.banu.com/tinyproxy/ and added content processing to it. It works well, but I need a standard benchmark to test my ...
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2answers
25 views

Debian : 2 Nic 2 different networks switches - kernel sees a bad network

Hello Here is the situation : - VMplayer with 2 physical NICs (network interface cards) on the Windows host - VM Debian 64bits - On VM settings: both NICs are configured to replicate on the physical ...
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56 views

Configure Linux PC as router

Consider the below network configuration. wan ----[WAN router] <----> [eth1 (PC2) eth0]<---->[eth0 (PC1)] wan ----[WAN router 192.168.169.1] <--> [192.168.169.5 (PC2) 10.1.2.3] ...
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2answers
61 views

How to ping two VMs running on different Host.?

I have two physical machine A and B (Fedora 22 everywhere). VM 'a' is running on host 'A'. VM 'b' is running on host 'B'. I want to ping VM 'a' from VM 'b' and vice-versa.
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Dnsmasq problem with Linux network namespace

I have tried to use dnsmasq as the name server for virtual machines. On all the vm-s, /etc/resolv.conf indicates the vm need to access 192.168.15.3 to resolve the domain names. However, the interface ...
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2answers
41 views

Network acting crazy… How can I know whether it's hardware?

I have a homeserver, with a built-in network card, ASRock E350M1 Motherboard. On the computer there's a Debian Jessie system on an SSD, and 4 HDDs in raid configuration for my data. I usually have ...
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87 views

Create Wifi Hotspot for sharing SOCKS Proxy on Ubuntu Server

I'm using Ubuntu Server and I have a SOCKS Proxy server on my client which is created with SSH -D command. I want to create a Wifi Hotspot on this computer which passes the traffic through this SOCKS ...
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Any potential problems when configure multiple NIC for isolated networks to have same subnet?

System I have an ARM Linux (kernel 3.17) for field use and it has multiple NIC, say eth0, eth1, and wlan0. On the left side, I need to use a PC0 to configure the ARM Linux so that it can change it's ...
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1answer
54 views

How to force TCP packets to use a specific NIC

My Linux (kernel 3.17) computer has more than one NIC: eth0, eth1, (and/or eth2...) I have several PC connected to each of them: PC0 <---> eth0 (192.168.1.100) PC1 <---> eth1 ...
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2answers
58 views

Why are `netmask`, `network`, `gateway` and `dns-nameservers` needed for setting up a static IP?

When setting up a static IP, you need to change /etc/network/interfaces to: auto eth0 iface eth0 inet static address 10.253.0.50 netmask 255.255.255.0 network 10.253.0.0 gateway ...
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1answer
31 views

What is the route within a local network?

The IP addr of my wlan1 is 192.168.1.3. $ netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default 192.168.1.1 0.0.0.0 ...
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1answer
46 views

Using ifplugd with a dhcp server

I have a desktop and a laptop each with a wireless and wired (eth0) network adapter running Arch Linux. The wireless network(s) that I am on prevents the laptop from seeing the desktop. What I would ...
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2answers
31 views

Determine gateway and other information without an IP

I have a server connected to a network. I'm logged into this server via console. The server was configured for a static IP, but this server used to live on a different vlan so the static IP ...
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2answers
71 views

Direct connection w/ ethernet cable

This is for "research" not pragmatic purposes -- I want to know how this is supposed to work, since my guess below does not. In other words, I do not want an answer that involves ...
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138 views

Debian 8 : where are default static routes set?

i'm facing a strange problem with my newly installed Debian 8 box : default static routes are missing the 0.0.0.0 destination route. $ sudo route -n Kernel IP routing table Destination Gateway ...
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How to control the data transfer rate in virtual network?

I am using Fedora 20 as a host machine and in virt-manager i m install Redhat, and window7 when i am copy any data from fedora machine(Host) to Redhat(Guest) the data transfer speed is almost 5mbps ...
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9 views

Darkstat issue with libpcap

So I've got darkstat installed and the page has been configured correctly. I actually changed the BINDIP to the IP address of the Linux box. But when I pull up the browser to view the display it ...
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31 views

Download speed reduced in few seconds

While im installing packages on my centos6.2x, Downloading Packages: Setting up and reading Presto delta metadata updates/prestodelta | 144 kB 00:01 ...
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Lenovo 3 and setting up wi-fi offline Fedora version 22

Can't seem to get the Wi-Fi to work. I'm rather new to Linux. $ lspci | grep -i broadcom 02:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03) $ uname ...
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1answer
60 views

How can I create an alias for a network device?

I'm trying to get a particular piece of software to run that uses a licence manager that hasn't noticed that newer Linux distributions don't name their network devices eth0 anymore. It is trying to ...
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64 views

Lenovo Yoga 3 and Wi-Fi on Fedora

Can't seem to get the Wi-Fi to work. I'm rather new to Linux. $ lspci | grep -i broadcom 02:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03) $ uname ...
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1answer
61 views

VMs “forgetting” MAC address of gateway on Ubuntu 14.04 host set up as a gateway using 1 NIC with 2 IP addresses on different subnets

I have an Ubuntu 14.04 server with one NIC. The MAC address on this NIC is assigned (by the data centre's gateway) one IP (X.X.X.100) in one subnet (X.X.X.0/24), with the gateway being in the same ...
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1answer
79 views

Why are IPv4 TCP connections showing as tcp6?

Here's the output of netsat -tupn on my Debian Jessie server: Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program ...
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40 views

Find all physical interfaces in FreeBSD

I have a use case to find all physical (no virtual or vlan interfaces) on FreeBSD. How can I get a count of the number of physical interfaces on a box consistently regardless of any virtual interface ...
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1answer
182 views

ping6 error 'operation not permitted'

I am unable to ping6 my gateway or beyond. I am able to ping6 my loopback successfully, but that is all. [\u@r2d2:/root] # ping6 ipv6.google.com PING6(56=40+8+8 bytes) ...
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1answer
47 views

Unable to receive ARP requests. Think it's a buggy driver. How to fix?

I have this problem with my laptop running Debian Jessie. I cannot gain any kind of network visibility on it from devices in the same network. I can't ARP the laptop, but the strangest thing is that ...
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53 views

UDP buffer overrun and old datagram clearing

I am reading UDP datagrams on a linux server at 700,000 per second from HDL32 LIDAR system. Interface is ipv4. Sockets are set to SOREUSADDR. I turn on the LIDAR, start up socket program, it started ...
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1answer
42 views

Mounting a network volume once Wifi is set up

I have some shared folders in my network that I would like to have mounted in my Raspberry Pi 2 once it boots. I have edited my /etc/fstab and if I manually run mount -a, I manage to have access to ...
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1answer
154 views

how to configure multiple interfaces with systemd-networkd

I have three physical network interfaces one my machine, they are all connected to different subnets, the first interface is eno1 with IP 10.10.24.157/24, the second one is eno2 with IP ...
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38 views

dladm show-phys shows speed 0

we have a M6-32 and I need to know which speed is running each interface. When I issue the dladm show-phys I have this strange behaviour: LINK MEDIA STATE SPEED ...
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46 views

Ubuntu Configuring static route with IPV6

I am having trouble getting ECE4110Host1 to ping ECE4110Host2 via static routing. I did it in IPV4 but not sure why I cant get it in IPV6. In the ECE4110Host1 command I enter: sudo ip -6 route ...
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1answer
50 views

Network interfaces up order, ipv6 tunnel problem

I have a ipv6 tunnel interface, that is using my network connection on eth0. when I turn on my system something messes up the things and I have no ipv6 connectivity. The system is Ubuntu 14.04 server ...
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31 views

Hostapd - no internet on server

I have setup local "hotspot" on my machine running Debian Jessie. I followed some instructions after which neither of tutorials worked for me. In the end I discovered I had a whitespace (I think) in ...