Managing and using network connectivity on a unix system

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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
85 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
42 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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23 views

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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23 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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49 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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31 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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1answer
74 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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2answers
120 views

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
39 views

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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42 views

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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1answer
50 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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0answers
23 views

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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1answer
29 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
357 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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54 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
44 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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50 views

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
40 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
69 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
32 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
49 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
48 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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2answers
47 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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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
49 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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57 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
26 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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0answers
125 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
59 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 ...
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1answer
49 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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0answers
30 views

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 ...
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0answers
26 views

Why is a 'Trusted Network' Port More Secure?

I'm working through this tutorial ATM. http://www.cyberciti.biz/tips/using-nginx-as-reverse-proxy.html I'm planning on using NGINX for a simpler scenario but I'm curious as to why the tutorial ...
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1answer
70 views

Add route from internal network to external network

I am using a box running Arch as my router and firewall (with shorewall). Recently, I tried to add another network onto the system, which failed horribly. After putting everything back where it was ...
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1answer
109 views

How do I figure out where wrong local dns results are coming from?

I'm running mint Mate 17.2. When I use dig, for a certain specific domain name, the resolved IP "answer" is wrong, and the answer server is 127.0.0.1. Trying to access this domain from my local ...
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0answers
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WiFi Drivers Not Working

I just installed Linux Mint 17.3 on my mid 2012 MacBook Pro. I'm currently trying to install the necessary drivers for WiFi via Driver Manager (nvidia-331 and bcmwl-kernel-source) for my BCM4222 ...
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19 views

Troubleshoot routing in rewrite/virtual host

I don't want a solution as much as a way to find the problem. I am learning networking mostly because it interests me and I set up something in my uncle's restaurant. It looks like this. A soft AP ...
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2answers
54 views

Renew my ip address (dhclient not found) [closed]

I recently got a new cable modem and my internet connection is no longer working. I suspect I need to renew my IP address. How can I renew my address? The command ifconfig returns: bash: ifconfig: ...
1
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1answer
40 views

Printing to ubuntu client via network, using php that reside in windows 7 webserver [closed]

I plan to change my windows 7 client to ubuntu 14.04 LTS. The client has a local printer (Epson LX-310) that is used to print an invoice in web app environment built using apache with php (the web ...
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0answers
28 views

NAO robot running Gentoo based OS cannot connect to Wi-Fi automatically

I am using NAO robot for my Masters Thesis. It is running OpenNAO OS Version 2.1.4.13. This OS is Gentoo based. The problem I am facing is that it doesn't automatically connect to one specific Wi-Fi ...
2
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0answers
51 views

DHCP to assign different addresses for multiple interfaces and subnets

First of all, I'd like to point out that I've read any related questions asked here. So, on my desktop computer (running Ubuntu) I have three NICs - eth0, eth2, eth3. I have links connecting these ...
2
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0answers
21 views

SNR or signal and noise levels in ad-hoc mode

I am using the WiPi dongle which is based on the rt2800usb driver on my Raspberry Pis (running raspbian) in an ad-hoc network, and I can't seem to be able to get any SNR, signal or noise level ...
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2answers
80 views

Send my IP to remote server every time booting

I want to send my computer's IP automatically every time it boots. I edit /etc/rc.local sleep 10 ifconfig > /tmp/myip scp /tmp/myip <server> exit 0 I tried, and there is no inet addr, ...
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1answer
43 views

TCP over TUN: SYN/ACK is received, but no ACK is generated, and socket remains in SYN_SENT state

I am tunneling an outgoing TCP connection over a TUN interface set up by a program I wrote. The TUN interface basically just relays the packets to/from a proxy server, with minimal modifications (...
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1answer
55 views

How to disable interface just for NetworkManager in Kali Linux?

I have two WLAN interfaces, and I want to disable one of them for NetworkManager, so that if I run something like service network-manager stop, all the interfaces should stop except on of the WLAN ...
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42 views

Virtualbox connectity from vboxnet0 to internal network

I am trying to create a setup with gateway(Guest OS Ubuntu) in middle and an webserver(Guest OS - Debian) - must be connected to VM-2 only via VM-1 from host pc. My aim is to ping 10.1.1.2 from Host ...
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4answers
78 views

Setting up hostnames on local network [duplicate]

So, I'm setting up an experiment network for me and the other geeks at my school to use for website testing and server practice, and I'm the sys and net admin (but really it's just for playing Quake). ...