Managing and using network connectivity on a unix system

learn more… | top users | synonyms (1)

0
votes
1answer
31 views

SSH DNS lookup on local IP addresses [duplicate]

As I have come to understand, SSH always goes through the process of reverse DNS lookups whether you are connecting to user@example.com or a local server calleduser@192.168.0.56. I do not know, ...
0
votes
1answer
49 views

SSH takes too long to ask for password

I've seen many other questions on this subject but none seem to actually solve my problem. Like any other day, I connect to my LOCAL Raspberry Pi server from my client machine at 192.168.0.5 with ssh ...
1
vote
0answers
16 views

iptables routing input and forward paths

I would like to know the flow of a packet given the configuration below. Suppose that I setup an adhoc network between my android phone and a NIC on my linux box. I then setup the android phone to ...
4
votes
1answer
42 views

Why does reading /proc/net/tcp take a long time ss is quick to return the same sort of data about the connections table?

On Linux 2.6.32, if you read (for example, cat) /proc/net/tcp, on a very loaded system (for example, a web server), you will find that reading 100K entries takes over 30 seconds. That's a long time. ...
2
votes
0answers
26 views

Multicasting with a Debian Router

I have a local network and I want to use NTP in multicast mode on this LAN. The first step to do this is to get multicast networking to work first. In the network I have 5 Debian machines all ...
0
votes
0answers
52 views

Ubuntu not allowing traffic to ports 1 - 1024

I seem to have encountered a weird issue whereby my ubuntu box is not allowing incoming traffic to the first 1024 ports or so, for both TCP and UDP. My iptables policy is set to ACCEPT for all 3 ...
3
votes
0answers
39 views

SoftIRQs and Fast Packet Processing on Linux network

I have been reading about performance tuning of Linux to get the fastest packet processing times when receiving financial market data. I see that when the NIC receives a packet, it puts it in memory ...
1
vote
0answers
31 views

Shutdown problem on Lenovo G50 after installing Linux Mint 17.3

After installing successfully Linux Mint 17.3 on Lenovo G50, its not rebooted. The error is : [397.188708] Fixing recursive fault but reboot is needed! [400.538090] init: mdm main process (2363) ...
0
votes
0answers
29 views

Set firefox to use non default gateway

I have 2 internet connections. One is set as default, so all traffic goes through it. Other have no default routes added, so no traffic goes through this internet connection by default. boby@hon-...
1
vote
1answer
46 views

Debian - No wired connection after restart

Last night I was working on my computer, for reference I'm using i3, and decided to uninstall XFCE4, as I felt I didn't need it. The next morning I turned on my computer and have no wired connection. ...
1
vote
0answers
14 views

/etc/network/interfaces automatically startup pppoe on wireless lan (wlan0) on boot and also make it persistent

I do have the following setting OK in /etc/network/interfaces: auto wlan0 auto dsl-provider iface wlan0 inet static address 192.168.XXX.XXX netmask 255.255.255.0 broadcast 192.168.XXX.255 wpa-ssid ...
0
votes
5answers
53 views

find IP and PORT in use by Apache

How can I find which IP:PORT Apache web server is monitoring? There are some network commands, but they show the TCP port in use. The machine has multiple network interfaces and the Listen section in ...
2
votes
2answers
62 views

Ping from subinterface

I have a sub-interface eth0:0 auto eth0:0 iface eth0:0 inet static address 192.168.2.96 netmask 255.255.255.0 gateway 192.168.2.1 and I try ping -I eth0:0 8.8.8.8 and I ...
1
vote
0answers
27 views

Bash check if firefox use internet

I want to check how much internet use Firefox with a shell script. Here I found good examples to see performances. #!/bin/sh free -m | awk 'NR==2{printf "Memory Usage: %s/%sMB (%.2f%%)\n", $3,$2,$3*...
3
votes
2answers
60 views

Assigning static IP address using nmcli

So I'm trying to give a VM a static IP address, this case has been particularly stubborn. The VM is running on a ESXi cluster with its own public IP range. I had it (sorta) working with an IPv4 ...
0
votes
1answer
42 views

bridge or route wlan traffic to eth

Have been trying to make a laptop share its wireless connection via ethernet to other devices, but am getting nowhere. First tried bridging, but soon found out bridging wireless interfaces is not that ...
0
votes
1answer
30 views

Resetting network interfaces when waking up from suspension

I carry my laptop in "suspended" state and routinely use the Ethernet port. When I move it, the usual sequence of event is: suspend, unplug all the wires (power, Ethernet), put in bag, move, take from ...
0
votes
2answers
33 views

Client route for OpenVPN Access Server

I am running OpenVPN Access Server and I'd like to push a route to every client on connection that is the equivalent of: sudo ip route add 172.17.0.0/24 via 172.27.232.1 Where should I go to set ...
1
vote
1answer
45 views

Strange MTU value from ping

I am trying to make on-line steam games work on my laptop. I have this problem: games can't connect to game servers if I run them on linux. If I run them on Windows they work fine. Other Windows ...
1
vote
0answers
43 views

Unknown network connections in nethogs (is it safe?)

It's about a month that I see some unknown connections in nethogs and I tried to understand what program is responsible for them but I failed. I'm not sure but it seems that my Internet connection ...
1
vote
0answers
31 views

Calculating the total traffic generated by an application in a network

I have network (shown above) with the same application (Appx) running on the nodes (Linux nodes). This Appx has data to send the same copy of the Appx running in each node (i.e. each Appx generates ...
2
votes
0answers
30 views

How to share a DHCP Server(Debian) that is created on VMware to other PC in the same switch

I've created a dhcp server(in Debian) on VMware. When I launch a new virtual machine on the same computer it works fine, it receives an IP address from the DHCP server. But how to connect other ...
0
votes
1answer
28 views

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 ...
1
vote
2answers
41 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 ...
1
vote
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....
-2
votes
2answers
51 views

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?
0
votes
0answers
72 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:...
0
votes
0answers
9 views

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, "...
1
vote
1answer
22 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. ...
1
vote
0answers
18 views

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(...
1
vote
2answers
30 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 ...
1
vote
1answer
57 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 ...
0
votes
0answers
47 views

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 ...
0
votes
0answers
18 views

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 ...
0
votes
0answers
34 views

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 ...
1
vote
0answers
69 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/...
0
votes
0answers
20 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 ...
0
votes
0answers
19 views

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 ...
2
votes
2answers
77 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 ...
0
votes
1answer
39 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 ...
0
votes
0answers
22 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 ...
0
votes
0answers
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 ...
2
votes
0answers
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 ...
0
votes
0answers
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 ...
3
votes
1answer
73 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 ...
4
votes
2answers
115 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 ...
2
votes
1answer
38 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 ...
1
vote
0answers
40 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><...
0
votes
1answer
49 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 ...
0
votes
0answers
21 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 ...