Managing and using network connectivity on a unix system

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Bourne to grep and forward specific text from across a LAN

I'd like to develop a shell that keeps forwarding me the greped text(say compilation errors or warnings, in a single txt output) to some E-mail ID or on some NAS mount point, most importantly from ...
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40 views

How ifconfg fetch enabled NICs?

I have searched this for a while, but there was no clear keyword to find same question. Briefly showing my question: ifconfig only shows enable NICs. # ifconfig br0 Link encap:Ethernet ...
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1answer
21 views

Add parameters to NFS mount

I try to start Android on device via NFS and TFTP. Everything goes good until Android system starts booting. Something happens with network parameters and connection falls and boot freezes [ 60....
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How to restart network in ubuntu server 14.04.04?

I tried using service network restart and /etc/init.d/networking restart, what command could I use now?
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58 views

How do I set up network connection via 3G USB modem for Linux?

I've spent a lot of time searching for a solution, but now I'm here. I need to set up LG 3G USB modem for my Ubuntu 16.04. The system is able to see the device: $ lsusb Bus 001 Device 004: ID 1004:...
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Why doesn't wpa_supplicant work when using crontab job?

I am writing a script that is installed via a crontab job. The point of the script is to locate a specific AP and connect to it on start up. The script will log its progress to a text file called, "...
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1answer
21 views

SSH in local network while hosting same network

I have the following setup: Computer A has a Wifi-USB adapter (and is a robot, so it doesn't need real internet access). It's running Ubuntu 14.04. Computer B is my Laptop running Ubuntu 14.04 also. ...
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If it possible to permanently set a loose source routing option to all ip packages to a specific ip address?

First of all, the loose source routing is a kind of ip options which requires a selected hop to route this package. I wonder if it possible to set loose source routing option on specific ip packages(...
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28 views

set up NFS two way syncronization [closed]

I have two servers that I want to "share" the home folder of, such that when I make changes on Server A they appear on Server B and when I make changes on Server B they appear on Server A. Right now ...
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1answer
56 views

How would I limit connections to certain services, to be only accesed via a connection coming from a sub-domains?

I have a personall machine running Ubuntu 14.04.4 LTS. I use it to host a Teamspeak and a Minecraft server and also a website. I am trying to make sub-domains to only point to the right services. So ...
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Arch-ARM: netctl not working correctly at boot

I've created a netctl profile that assigns a static address and alias to my eth0 NIC, however when I boot the interface doesn't come up at all. I check with systemctl status netctl@eth0.service and ...
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SAMBA Share Not ReadWrite

I've set up a folder (on srv005) /mnt/local/data owned by msc:msc_group. drwxr-xr-x 4 msc msc_group 4096 Jun 9 22:33 data I've set up SAMBA with the following share options: [srv005_data] comment ...
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My network interface disappears from /run/network/ifstate

Here's the relevant parts of my interfaces configuration file: # grep -vP '^(#|$)' /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.0.10/24 ...
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52 views

Why is my network unreachable in virtual machine with RHEL 7.2?

I got a 30-Day evaluation of RHEL 7.2. I installed into a VirtualBox machine, and tried to register my subscription: # subscription-manager register Registering to: subscription.rhn.redhat.com:443/...
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19 views

What would cause itermittent internet connectivity on my server?

I occasionally have trouble with an ubuntu VM I set up for testing developement work - it occasionally becomes inaccessible to ssh, can't connect to archive.ubuntu.com for updates, etc. It has two ...
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Multiple Subinterfaces on a Wireless NIC (Ubuntu)

I need to create multiple subinterfaces on a wireless NIC. I have done it on a regular wired NIC before but before I test myself, I wanted to find out from the community if it is possible. The ...
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2answers
49 views

Slow scp transfer speed over wan

I have got a 300mbit symmetrical fiberoptic line, and I have got to transfer a 51MBYTE tar file from HOST A (fiberoptic 300mbit) to HOST B (digitalocean machine with more than gigabit bandwith). On ...
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1answer
31 views

How to disable Wake on Lan

Windows also has Wake on Lan that allows a computer to be woken up from sleep; additionally, this can be disabled by a user on said computer. I know that WoL exists on Linux, but how does one ...
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how to install openssl fips on unix

I am new to OpenSSL and trying to install openssl-fips module. Current version is openssl-1.0.1efips. Steps performed --- cd openssl-fips-2.0.12 ./config make sudo make install but it does not ...
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21 views

Changed the DNS Server and cannot connect to Internet from Guest OS!

I recently changed my DNS Server in my router to Google's DNS Server because the ISP's DNS Server was rerouting my every requests to guide.domain-error.com/... when I was trying to connect to Internet ...
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47 views

Network traffic monitor “nettop” morphing away from expected results

On Mac, I open a new shell and enter nettop. For a split second I see chrome (as I expected) and some other things going on (had to record screen to catch them); then I'm only shown data on ...
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24 views

Assign Static IP to KVM CentOS Guest.

I am attempting to set up a CentOS(7) guest on my Linux Mint(17.3) system using KVM. My Mint host has a static IP (10.10.16.247) configured already and is currently fully network functional.I have a ...
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65 views

How to tell whether a process is network I/O intensive or not in user mode in Linux?

I am currently writing a program in Linux which needs to tell whether a specific process is network I/O intensive or not at runtime. I have tried some tools such as iotop and iftop, but none of them ...
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Linux DNS Suffix Configuration

Introduction I have a Raspberry Pi running Rasbian connected to a Windows Server based network. This is a corporate (education) network that has its own intranet consisting of all connected computing ...
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1answer
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LXC container gets two IP addresses assigned to it

I'm playing around with LXC on my Arch Linux workstation as a learning experience. I'm following the guide on the LXC page on the Archwiki and setting up a static ip for the container. This is what my ...
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cURL: Java website not loading

I can access the configuration page of my device with no problems via web browser (on the GUI). But it doesn't seem to work by using cURL: luis@Fresoncio:~$ curl http://192.168.1.232 <html><...
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38 views

Suricata: nf_queue: full, dropping packets(s)

I am using Suricata IDS in NFQUEUE mode: iptables -A PREROUTING -m mark ! --mark 0x1/0x1 -m comment --comment "Suricata NFQUEUE handler" -j NFQUEUE --queue-num 0 --queue-bypass Today server port ...
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Settings of Poller Interval and Cron Interval on cacti

Latest version running of Cacti on linux machine and I am bit confused with Poller Type, Poller Interval and Cron Interval. The current setup is set to monitor ping latency, linux machine and dns ...
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26 views

internet connection issue after installing ubuntu

I just installed ubuntu 16.04 on a HP labtop. The installation process was finished successfully. I also enabled the wireless internet, the wireless icon shows the wireless connection is established. ...
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2answers
197 views

SSH broken pipe, message authentication code incorrect

I have set up a Ubuntu server that I plan on using to backup my macbook air using rsync. But every time I use rsync, or even scp, the connection drops, with one of the following errors: ...
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50 views

IP address not seen on ifconfig

I've imported a virtual machine from work onto my home pc and I can't connect to it through SSH. I've checked ifconfig and there is no IP address next to inet. I thought it could be something with ...
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1answer
35 views

Why would a container not be bridged to the local network by default?

From my understanding on container technology (like lxc or docker), when you create a container it by default uses a "private network" like 10.0.1.x. I do not understand why you would not want it on ...
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Why “echo f” in the case of clearing conntrack table doesn't work on debian?

Many people don't clear the conntrack table when they want to reload their firewall rules. When you have some ESTABLISHED connections, all the sessions won't be affected when you add a rule that ...
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1answer
38 views

Shorewall 4-interface setup

I am trying to use shorewall on Arch to manage a setup with 2 local networks and 2 ISP connections. Ultimately I want traffic from local network 1 (192.168.1.0/24 interface enp5s0) to use ISP 1 (76. .....
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1answer
56 views

Is there an equivalent to top but for network I/O?

Is there a program that I can use to list processes based on their current network I/O usage? top does CPU, and on FreeBSD at least, it will also do disk I/O if you pass it -m io (I assume that there'...
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OpenVPN high cpu usage when reconnecting to network

Whenever my network disconnects/reconnects the openvpn service (this is client side) cpu usage goes to 90%. If i manually stop and start it resumes ok. I tried debugging but i'm not sure i checked ...
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1answer
31 views

Can't see any public WiFi

I cannot see any public WiFi using a USB Wifi adapter (TPLink-WN322G). I've installed Kali Linux on my computer. In my other PC and smartphone I can see WiFi connections. After you connect to one ...
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1answer
38 views

Mount Samba in Linux Mint

How can I mount my Samba HD from my stock Asus n66u router to Linux Mint laptop over the air? I’ve tried tutorials, but they are either very confusing (since I don’t use Linux too often) or using a ...
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1answer
46 views

Configure my modem not to be a router

I would like to configure my linux box to act as its own router, or maybe the better way to put it is that I want the box to connect to the internet directly with no router. There are some other ...
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31 views

DHCP fails after connection switched to bridge mode

I have a new XFinity modem. I changed it to "bridge mode" using the 10.0.0.1 admin interface. Then I did ifdown and ifup. Now, all connectivity is cut and there is no new IP lease. I get "NO OFFERS ...
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2answers
40 views

How can I check the version of BIND on Debian [closed]

I am using Debian and when I give the command sudo named -v it returns command not found. I want to verify that my ssh server (sshd) is using bind version 9.1.3 or later so that it both is IPv6 ...
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26 views

DHCP and Option82 unable to allocate addresses

On my pc, I have four NICs - eth0,eth1,eth2,eth3. eth1 is connected to the company LAN. eth0,eth2,eth3 are connected to a switch I am currently configuring as a study. eth0 is the dhcp server, eth2 is ...
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1answer
41 views

Connect network namespace to internet

My scenario is this: I want to be able to execute a program in a separate namespace with a network interface of its own. But I also want it to be able to access internet though my physical network ...
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51 views

How can I use two Ethernet cards in AWS Ubuntu LTS 14.0

We are using two Ethernet cards in an AWS Ec2 instance. And trying to ping with both Ethernet card by using ping -I eth0 google.com and ping -I eth0 google.com, we got the response from eth0, and eth1 ...
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1answer
24 views

Getting all open ports on all network interfaces

I have installed and run docker and now it created another network interface docker0: 3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/...
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67 views

ftp failing to retrieve directory listing

I'm trying to connect to my ftp server but I'm getting Status: Disconnected from server Status: Connecting to 127.0.0.1:21... Status: Connection established, waiting for welcome message... Status: ...
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2answers
48 views

Get Wi-Fi interface device names

Similar to a previous question about finding network device names, I would like to get a (reliable) list of device names but just for Wi-Fi devices. So that it looks like the following depending on ...
4
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1answer
48 views

Mac randomisation with systemd?

Is it possible to randomise the mac address with systemd itself? I have heard that it is possible in newer versions of systemd. This is my systemd version: systemd --version systemd 229 +PAM +AUDIT +...
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1answer
20 views

Very low disk performance on Samba

I'm using Samba on Debian 8.4 (Jessie) to share files with a small number of Windows & Mac users (~20 total, ~5 at a time at most) and I'm seeing abysmal performance on read and write: tested by ...
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Can Linux decapsulate double GRE encapsulation?

For an application when the packets arrive at the receiving host, those packets are double GRE encapsulated (IP Hdr + GRE Hdr + IP Hdr + GRE Hdr + payload packet). I am wondering if Linux kernel in ...